Best Interview Questions to Ask as an Ethical Hacker

1

Why do interviewers compare IDS and IPS

Reference answer

They want to see if you understand reaction timing. An IDS raises alerts while an IPS takes action immediately which can stop threats before damage happens.

2

What Is Software and Data Integrity Failures Vulnerability?

Reference answer

Software and data integrity failures occur when applications do not properly protect against tampering or data manipulation. Attackers can exploit this vulnerability to inject malicious code or modify data, leading to security breaches. Penetration testers identify integrity flaws to evaluate data protection and application security measures.

3

What is a "firewall"?

Reference answer

A firewall is a network security device that acts as a barrier between a private network and the public internet. It examines incoming and outgoing network traffic and blocks any traffic that doesn't meet defined security rules, protecting the private network from unauthorized access.

4

What certifications are useful for penetration testers?

Reference answer

Certifications include CEH, OSCP, GPEN, PNPT, and advanced security certifications.

5

What is the OWASP Testing Guide, and what are its standards?

Reference answer

The OWASP Testing Guide is a comprehensive guide to web application penetration testing, providing standards and best practices for testing web applications.

6

How would you remotely access a service that can only be accessed from within an internal network?

Reference answer

Port forwarding is a technique used to redirect a communication request from one address and port number combination to another. For example, if port 80 is only accessible from within the internal network but port 443 is accessible remotely, a port forward rule can be created to forward all incoming traffic on port 443 to port 80.

7

Write a Python function that checks if a given URL is reachable and returns the HTTP status code.

Reference answer

import requests def check_url_reachability(url): try: response = requests.get(url) return response.status_code except requests.RequestException as e: return f"Error: {e}"

8

What is SQL Injection and how can it be prevented?

Reference answer

SQL Injection is a web security vulnerability that allows attackers to interfere with the queries an application makes to its database. It occurs when user input is improperly sanitized and directly included in SQL statements, enabling attackers to manipulate or alter the underlying SQL query. This can lead to unauthorized access, data theft, or even destruction of the database. To prevent SQL Injection, several measures should be implemented. Prevention methods include: - Using parameterized queries - Input validation - Escaping special characters - Implementing least privilege - Using stored procedures

9

How Do You Ensure the Security and Privacy of Client Data During a Penetration Test?

Reference answer

This question evaluates ethical considerations and professionalism. A good answer will include measures such as data encryption, secure storage, and strict access controls. Candidates should also mention adherence to legal and regulatory requirements.

10

What is a Security Operations Center (SOC)?

Reference answer

An information security team is located in a centralized facility called a Security Operations Center (SOC). Their duties include the detection, analysis, and prompt response to cybersecurity incidents by utilizing various technological solutions and processes. Typically, the team consists of Security Analysts, Engineers, and Managers who collaborate closely with the incident response team.

11

What Is Insecure Design Vulnerability?

Reference answer

Insecure design vulnerability refers to flaws in application architecture or security logic. It results from poor planning or lack of security considerations during development. Penetration testers exploit these vulnerabilities to highlight design weaknesses and recommend improvements.

12

What is "intrusion detection system (IDS)"?

Reference answer

An intrusion detection system (IDS) is a software or hardware device that monitors network traffic and detects potential malicious activity. It analyzes network patterns for suspicious behaviors and alerts administrators to possible threats. It can be implemented on a host system or on the network itself.

13

What do interviewers really mean by ethical hacking

Reference answer

Ethical hacking is basically about thinking like an attacker but working for protection. Companies hire ethical hackers to find weak points early because fixing issues before an attack is always cheaper and safer.

14

Explain the concept of OWASP Top 10.

Reference answer

The OWASP Top 10 is a standard awareness document published by the Open Web Application Security Project (OWASP) that lists the ten most critical security risks to web applications. It is widely used as a guideline for developers and security professionals to prioritize security efforts, covering risks like injection, broken authentication, and security misconfiguration.

15

What is the principle of least privilege?

Reference answer

The principle of least privilege grants users only the minimum permissions necessary to perform their tasks.

16

Explain the concept of zero-day exploits.

Reference answer

A zero-day exploit is an attack that targets a previously unknown vulnerability in software or hardware for which no patch or fix is yet available. It is called 'zero-day' because developers have had zero days to address the flaw, making it highly dangerous and valuable to attackers.

17

What is red teaming?

Reference answer

Red teaming simulates real-world attacks to test an organization's detection and response capabilities.

18

What is penetration testing? Mention some popular penetration testing tools.

Reference answer

A penetration test or a pen test is the simulation of a cyberattack on a computer to check for potential vulnerabilities in the system. It is commonly implemented to augment a web application firewall (WAF). It can involve a simulated attack on any number of application systems such as APIs, frontend servers, and backend servers to discover any vulnerabilities present. The insights gained through this kind of testing can be used to tighten the WAF security policies and fix the detected issues. Following are a few popular tools used for penetration testing: Netsparker, Wireshark, Metasploit, BeEF, Aircrack.

19

What is the difference between a vulnerability and a security risk?

Reference answer

A vulnerability is a weakness in a system, application, or process that can be exploited by a threat. A security risk is the potential for loss or damage when a threat exploits a vulnerability, considering the likelihood of the exploit and the impact on the organization.

20

What is CSRF (Cross-Site Request Forgery) in Ethical Hacking? How can you prevent this?

Reference answer

Cross-Site Request Forgery (CSRF) is a type of web attack that involves tricking a user into making a request to a website that they are already authenticated against, without their knowledge. For example, an attacker might create a malicious website that sends a request to a user's bank website to transfer money, without the user being aware of the request. To prevent CSRF attacks, web developers can implement measures such as adding unpredictable challenge tokens to each request and associating them with the user's session. This ensures that the request received is from a valid source, rather than from a malicious website trying to impersonate the user. Other measures to prevent CSRF include adding a secret key to the request header or requiring the user to re-enter their login credentials for certain actions.

21

What are some common web application vulnerabilities? (e.g., SQL injection, XSS)

Reference answer

Common web application vulnerabilities include SQL injection, cross-site scripting (XSS), cross-site request forgery (CSRF), insecure direct object references (IDOR), security misconfigurations, broken authentication, and sensitive data exposure.

22

What is a "ransomware" attack?

Reference answer

Ransomware is a type of malware that encrypts a victim's data and demands payment for its decryption. Attackers threaten to permanently delete the data if the ransom is not paid.

23

What's the difference between a vulnerability assessment and a penetration test?

Reference answer

A vulnerability assessment and a penetration test are complementary but distinct processes used to enhance an organization's security posture. A vulnerability assessment is a systematic approach to identifying and prioritizing potential vulnerabilities in a system, network, or application. It focuses on cataloging weaknesses and providing a risk rating for each, highlighting areas that require remediation. However, it does not actively exploit these vulnerabilities. On the other hand, a penetration test, often referred to as ethical hacking, goes a step further by simulating real-world attacks to actively exploit vulnerabilities. The goal is to assess how far an attacker could compromise a system and to test the effectiveness of existing defenses. While vulnerability assessments are broader and often automated, penetration tests are more targeted, manual, and simulate real threats, offering deeper insights into an organization's security readiness. Both are essential for building a robust cybersecurity strategy.

24

What are some common security hardening techniques?

Reference answer

Security hardening involves strengthening a system's security by reducing its attack surface and mitigating potential vulnerabilities. Common techniques include: - Disabling unnecessary services and protocols: Removing services that are not essential for the system's operation to reduce potential attack vectors. - Applying security patches and updates: Regularly patching systems with security updates to address known vulnerabilities. - Using strong passwords and multi-factor authentication: Implementing strong password policies and enabling multi-factor authentication to protect against unauthorized access. - Implementing network segmentation: Dividing the network into smaller segments to isolate sensitive systems and limit the impact of a breach.

25

Explain what is Buffer Overflow?

Reference answer

Buffer overflow is a software security vulnerability where attackers access unauthorized memory to gain shell access. Many C/C++ memory functions lack bounds checking, leading to this vulnerability.

26

What is privilege escalation and how do you handle it?

Reference answer

Privilege escalation is a type of attack that aims to gain unauthorized privileged access into a system. The goal of privilege escalation after gaining a foothold on a system is to further our access to the level of an administrative user or find some bit of data (such as a password in a script file) that can be used to move laterally within the network. Privilege escalation always starts with a detailed enumeration of the system we land on, including but not limited to: the operating system type and version, kernel level, running processes, installed services and applications, current user privileges, network traffic sniffing, hunting for sensitive data in various file types (configuration files, scripts, password managers, spreadsheets, etc.

27

How do you adapt your communication style when working with different personalities and team members with diverse backgrounds?

Reference answer

You will be expected to interact and work with these diverse personalities daily, which requires strong communication, teamwork, and emotional intelligence skills. Discussing how you've changed your communication style in the past to interact with different people is a good way to demonstrate these skills.

28

What is the difference between WPA2 and WPA3?

Reference answer

WPA2 and WPA3 are both security protocols designed to safeguard wireless networks, but they differ in features and levels of protection. WPA2, which stands for Wi-Fi Protected Access 2, has been the standard for many years, utilizing AES encryption to provide a secure connection. However, WPA2 is vulnerable to certain attacks, such as the KRACK (Key Reinstallation Attack), which can compromise network security. WPA3, the successor to WPA2, introduces stronger security measures to address these vulnerabilities. It includes more robust protection against password-guessing attacks by employing Simultaneous Authentication of Equals (SAE), which replaces the Pre-Shared Key (PSK) exchange used in WPA2. Additionally, WPA3 offers improved encryption strength with forward secrecy, ensuring past session data remains secure even if long-term keys are compromised. It also simplifies security configuration for devices through features like Easy Connect, catering to the growing number of smart devices in networks. Overall, WPA3 provides a stronger, more resilient layer of security compared to WPA2.

29

Vulnerability Assessment vs Penetration Testing

Reference answer

Vulnerability Assessment identifies vulnerabilities, is tool-heavy scanning, provides surface-level findings, and has no proof of impact. Penetration Testing exploits vulnerabilities, uses manual attack simulation, performs deep exploitation, and demonstrates real risk. Smart interview tip: Say this line: "Vulnerability assessment tells you what could happen. Pentesting proves what can happen."

30

What Are Socks4a and Proxy Chains in Penetration Testing?

Reference answer

Socks4a and proxy chains are tools used for anonymizing network traffic during penetration testing. Socks4a proxies network requests, masking the source IP. Proxy chains route traffic through multiple proxies, making it harder to trace the attacker's origin.

31

Could you list the OWASP Top 10?

Reference answer

- Broken Access Control - Cryptographic Failures - Injection - Insecure Design - Security Misconfiguration - Vulnerable and Outdated Components - Identification and Authentication Failures - Software and Data Integrity Failures - Security Logging and Monitoring Failures - Server-Side Request Forgery (SSRF)

32

What are the key components of a penetration testing report?

Reference answer

The key components of such a report include: - Executive Summary – A high-level overview of the test results, including the scope, objectives, and key findings, tailored for non-technical stakeholders. - Scope and Methodology – A detailed description of the testing scope, tools used, and approaches employed to perform the penetration testing. - Vulnerabilities Identified – A comprehensive list of discovered vulnerabilities, ranked by severity, with descriptions of their potential impact on the system. - Evidence and Proof of Exploitation – Screenshots, logs, or other evidence demonstrating the exploitation of vulnerabilities to support the findings. - Recommendations and Remediation – Suggested solutions and best practices for addressing identified vulnerabilities, helping to strengthen security posture. - Technical Details – An in-depth analysis of the findings, including affected systems, exploit details, and any relevant technical information. - Conclusions and Next Steps – A summary of the pen test results and actionable steps to mitigate risks and improve security. Each of these components ensures that the report serves as a valuable resource for enhancing the organization's security framework.

33

What is Enumeration in Ethical Hacking?

Reference answer

Enumeration is the process of extracting information about a system, such as machine names, user names, network resources, shares, and services. It is often used in the context of an intranet environment, where a hacker or attacker may attempt to gather information about a network or system in order to gain unauthorized access or launch an attack. There are several different techniques that can be used for enumeration, including scanning tools and manual methods such as social engineering. The goal of enumeration is to gather as much information as possible about the target system, with the ultimate aim of finding vulnerabilities or weaknesses that can be exploited. Enumeration can be a complex and time-consuming process, but it is an important step in the hacker's process. By gathering information about a system, a hacker can better understand its structure and vulnerabilities and can develop a plan of attack that is tailored to the specific system. Overall, enumeration is an important part of Ethical Hacking and cybersecurity. By understanding how to perform enumeration, security professionals can better protect their systems and networks against cyber threats.

34

What is the difference between TCP and UDP scanning?

Reference answer

TCP scanning completes the three-way handshake, while UDP scanning sends UDP packets and analyzes responses, which is less reliable.

35

How would you approach testing a cloud environment that you are unfamiliar with?

Reference answer

You first understand the cloud setup, services in use, and access permissions. Then, you plan your tests carefully, using cloud-native tools and best practices to avoid affecting live systems. You document all findings, highlight risks, and provide actionable recommendations for improving cloud security, such as proper access control, logging, monitoring, and configuration management.

36

What is WEP, and why is it insecure?

Reference answer

WEP (Wired Equivalent Privacy) is a wireless security protocol that uses a weak encryption algorithm, making it vulnerable to hacking.

37

What is a penetration testing report?

Reference answer

A penetration testing report is a detailed document that outlines the security vulnerabilities identified during a penetration test. It includes an analysis of the exploited weaknesses, their potential impact, and recommendations for mitigating these risks. This report helps organizations strengthen their security posture by addressing critical flaws.

38

What is "HTTPS"?

Reference answer

HTTPS (Hypertext Transfer Protocol Secure) is a secure communication protocol that uses encryption and digital certificates to protect data transmitted over the internet. It ensures that communications are secure, confidential, and tamper-proof.

39

Explain the concept of SQL injection and how to prevent it.

Reference answer

SQL injection occurs when attackers insert malicious SQL code into queries, potentially accessing or manipulating data. Preventive measures include using prepared statements, parameterized queries, and sanitizing inputs.

40

What is malware analysis?

Reference answer

Malware analysis examines how malware operates to develop countermeasures and improve cybersecurity defenses.

41

What is SQL injection?

Reference answer

SQL injection is a code injection technique that exploits a security vulnerability in an application's database layer by inserting malicious SQL statements.

42

What is the role of blockchain in cybersecurity?

Reference answer

Blockchain provides a tamper-proof decentralized ledger, ensuring secure transactions and preventing unauthorized data modifications. Learning common hacking questions can help you understand how cybercriminals think and how ethical hackers stop them.

43

What is the difference between black box and white box testing

Reference answer

Black box testing starts with no system knowledge while white box testing provides full access which changes how tests are planned.

44

What are ports 20 and 21 used for?

Reference answer

Both are associated with FTP (File Transfer Protocol). Port 21 handles the control connection, commands, and responses. Port 20 handles the actual data transfer in active mode. From a security standpoint, FTP sends data, including credentials in plain text, which makes it a target for sniffing attacks. Most security assessments flag open FTP ports as a risk and recommend SFTP or FTPS as replacements.

45

What is Penetration Testing, and Why is it Important?

Reference answer

This question assesses the candidate's foundational knowledge. A good answer should include the purpose of penetration testing, which is to identify and fix security vulnerabilities before they can be exploited by attackers. Candidates should also mention the importance of maintaining security and compliance standards.

46

What is the difference between a vulnerability assessment and a penetration test?

Reference answer

A vulnerability assessment identifies and lists vulnerabilities, while a penetration test exploits them to determine the actual risk and impact.

47

Secure and HTTPOnly flags

Reference answer

Secure and HTTPOnly are flags that can be set against session cookies. The secure flag ensures that cookie information is only transmitted over an HTTPS channel. The HTTPOnly flag ensures that cookie information can only be accessed by the web server and not by client-side scripts, this limits the damage that XSS could to to a victim user.

48

What is "authorization"?

Reference answer

Authorization is the process of determining what actions an authenticated user or device is allowed to perform within a system or resource. It controls access based on predefined permissions and roles, ensuring that users only have access to the information and functions they are authorized to use.

49

What is Burp Suite, and how does it work?

Reference answer

Burp Suite is a web application penetration testing tool that helps penetration testers identify vulnerabilities in web applications.

50

Describe the process you would use to find and exploit a buffer overflow vulnerability?

Reference answer

To find and exploit a buffer overflow vulnerability, the process typically involves several steps: - Identifying the Vulnerability: Begin by analyzing the target application's functionality and input handling. Use techniques such as fuzz testing to supply unexpected or oversized inputs, observing how the program handles them. Review the source code (if available) for unsafe functions like `gets()`, `strcpy()`, or unchecked buffer allocations. - Debugging and Tracing: Use debugging tools such as GDB (GNU Debugger) to monitor the program's execution. Look for signs of crashes or memory corruption when testing with large or crafted inputs. Note any locations where the input value overwrites significant control structures, like the return address. - Determining the Offset: Identify the exact point at which the overflow happens by inputting a pattern of characters and analyzing the program's behavior. Tools like pattern generators (e.g., from Metasploit) can assist in pinpointing the precise offset required to overwrite the return address or other crucial memory areas. - Crafting the Exploit: Once the offset is known, construct a payload. This typically includes shellcode—machine code that performs malicious actions—along with a carefully calculated return address that points to the shellcode's location. Ensure the padding matches the buffer size to maintain alignment. - Testing the Exploit: Execute the payload against the target in a controlled environment to confirm its effectiveness. Use sandboxing or virtual machines to avoid unintended consequences during testing. - Fine-tuning and Evasion: If the target employs defenses like ASLR (Address Space Layout Randomization) or DEP (Data Execution Prevention), additional steps such as bypassing these mitigations may be required. Techniques may include Return-Oriented Programming (ROP) or finding static addresses to anchor the exploit. Throughout this process, it is crucial to perform all testing in legally authorized environments and for ethical purposes, respecting the principles of responsible disclosure and aiming to improve the security posture of affected systems.

51

What is the difference between active and passive reconnaissance?

Reference answer

Active reconnaissance involves directly interacting with the target system to gather information, such as using ping sweeps or port scans, which can be detected. Passive reconnaissance involves collecting information without direct interaction, such as monitoring public records, social media, or network traffic passively, making it harder to detect.

52

What is the difference between banner grabbing and OS fingerprinting?

Reference answer

| S.No. | Banner grabbing | OS fingerprinting | |---|---|---| | 1 | Banner grabbing is a technique that hijacks the advertisements displayed on the user's computer screen to inject malware into their browsers. | OS fingerprinting is a process of uniquely identifying a device by analyzing the operating system and hardware information. This information can be used to track the device and gather other confidential data. | | 2 | The data extracted from the banners can be used to hijack the user's session. | This information can be used to track the device and gather other confidential data. | | 3 | This can be done by analyzing the content of the web pages and looking for user authentication banners or other sensitive information. | OS fingerprinting works by collecting various pieces of information about the system, including the configuration and the operating system. This information is then used to identify the computer. |

53

How can penetration testing help with incident response planning?

Reference answer

Penetration testing can help organizations identify vulnerabilities and develop incident response plans to respond to potential security incidents.

54

What are common security risks in mobile apps?

Reference answer

Many mobile apps can be unsafe if they don't protect user data properly. Common risks include weak passwords, storing data without protection, and insecure connections. Developers should use strong security settings, encryption, and regular security checks to keep apps safe.

55

How will you avoid ARP poisoning?

Reference answer

ARP poisoning is a network-based attack that could be avoided by the following techniques: - Packet Filters: Packet filters filter and reject packets that include conflicting source address information. - No trust relation: The organization should design a protocol that is based on the trust relationship as little as possible. - Use ARP-spoofing software: Some applications verify and authenticate the data prior to sending them and block information that is spoofed.

56

What are the most common types of malware?

Reference answer

The most common types of malware are viruses, which are self-replicating and can spread to other systems, trojan which are disguised as legitimate software, worms are like viruses but do not require a host program to spread, spyware such as keyloggers are used to sensitive information such as credentials, adware which are used to display advertisement and are usually harmless, ransomware which are designed to lock users out of their systems and demand a ransom, logic bombs which are activated at a specific time or when a specific event has occurred and rootkits which are backdoors that allow an attacker to maintain remote control over a system and are particularly hard to identify and remove

57

What is penetration testing, and can you explain the difference between vulnerability scanning and pentesting?

Reference answer

A penetration test is an organized, targeted, and authorized attack that tests the security posture and defensive capabilities of IT infrastructure. Normally, there's a specific agreed-upon time frame that a penetration test will span, rules of engagement, and a clearly defined scope. In the end, the expected deliverable is a detailed penetration test report that security teams can use to mitigate any vulnerabilities that were discovered. Penetration tests are important because they are a great way to check if your security controls and processes are actually working. Without conducting penetration tests, I believe organizations can have a false sense of security. A simple comparison I keep in mind is that pentesting is like checking if the door to your home is actually locked and the alarm is armed. I may think “Did I actually lock my door and arm the alarm?” I can turn around and check by trying to open the door. A penetration test takes this a step further and emulates a malicious attacker without all the destructive elements. It makes sure the security controls are doing what they are expected to do. Or even identifies the need for security controls where there are none. The main focus of a vulnerability assessment is to identify and categorize risk associated with vulnerabilities discovered in IT assets. Typically they are conducted using automated scanning tools like Nessus or OpenVAS. They are commonly conducted as completely different assessments than penetration tests and do not focus on penetrating further into the network environment through the active use of exploits and attack chaining. Organizations often have a vulnerability assessment done because they are required to for compliance reasons. PCI-DSS (Payment Card Industry Data Security Standard) is one example, they require an internal and external vulnerability scan quarterly as outlined on page 23 of the PCI DSS v3.2.1 Quick Reference Guide. That said, a vulnerability assessment is not as comprehensive as a penetration test.

58

Windows Privilege Escalation Methods

Reference answer

Key techniques include: weak service permissions, unquoted service paths, DLL hijacking, AlwaysInstallElevated, token impersonation, scheduled task abuse. Tools often mentioned: WinPEAS, PowerUp, Seatbelt. But again — methodology matters more than tool names.

59

What is "secure coding"?

Reference answer

Secure coding is the practice of developing software with security in mind, minimizing vulnerabilities and reducing the risk of exploitation. It involves following best practices, using secure coding libraries, and performing code reviews to identify and fix security flaws.

60

Coding Question: Write a script to generate a simple hash for a string in Python.

Reference answer

Python import hashlib def generate_hash(text): result = hashlib.sha256(text.encode()) return result.hexdigest() print(generate_hash("ethicalhacking"))

61

What are bypassing the limitations of switches?

Reference answer

There are many switches that can be used in networking, but some of them have certain limitations. Bypassing the limitations of switches helps to improve network performance and increase bandwidth utilization. Switches with bypass features are available as standalone units or they can also be integrated into a Network Management System (NMS). Bypassing the switch's limitations can have a number of benefits. By bypassing the switch's normal limitations, the switch can be used to achieve higher system performance. For example, a bypass switch that is capable of switching AC currents at a maximum of 1000 amps can be used to switch DC currents at a higher voltage. This can greatly improve the system's reliability and performance.

62

Difference Between Vulnerability & Risk

Reference answer

Vulnerability: Security weakness, technical flaw, example: XSS. Risk: Business impact, exploitable consequence, example: Session theft. A system may have vulnerabilities, but risk depends on exploitability + impact.

63

How do you stay updated on cybersecurity trends?

Reference answer

I stay updated by reading cybersecurity blogs, participating in forums like r/cybersecurity, attending webinars, and completing relevant online courses.

64

What Types of Malware Have You Encountered During Testing?

Reference answer

Common malware includes viruses, trojans, worms, ransomware, and spyware. These programs exploit system vulnerabilities, steal data, or disrupt operations. Penetration testing helps detect and remove malware by identifying weaknesses and applying effective security measures.

65

Write a bash script to list all files in a directory that were modified in the last 7 days.

Reference answer

Look for: Familiarity with bash scripting and file system commands. #!/bin/bash find /path/to/directory -type f -mtime -7

66

What is penetration testing? Mention some popular penetration testing tools.

Reference answer

A penetration test, also known as a "pen test," is a simulated cyber attack on a computer system designed to identify potential vulnerabilities. It is often used to supplement the protection provided by a web application firewall (WAF) and can involve testing various application systems such as APIs, frontend servers, and backend servers to uncover any vulnerabilities. The information gained from this type of testing can be used to improve the security policies of the WAF and fix any detected issues. There are several tools that are commonly used for penetration testing, including: - Netsparker: A web application security scanner that helps identify vulnerabilities such as SQL injection and cross-site scripting. - Wireshark: A network protocol analyzer that allows users to see what is happening on their network at a microscopic level. - Metasploit: A framework for developing and executing exploits that can be used to test the security of a system. - BeEF: A browser exploitation framework that allows users to test the security of web browsers and identify vulnerabilities. - Aircrack: A suite of tools for monitoring and analyzing wireless networks, with a focus on security.

67

What Is Broken Access Control Vulnerability?

Reference answer

Broken access control occurs when attackers gain unauthorized access due to weak or misconfigured permissions. It allows them to access restricted areas, modify data, or escalate privileges. Penetration testers exploit access control flaws to identify security gaps in applications.

68

What is the OWASP Web Application Security Testing Guide, and what are its standards?

Reference answer

The OWASP Web Application Security Testing Guide is a comprehensive guide to web application security testing, providing standards and best practices for testing web applications.

69

What is the purpose of sandboxing

Reference answer

Sandboxing isolates programs so suspicious files can be tested safely without affecting the main system.

70

What is a firewall, and how does it work?

Reference answer

A firewall is a network security system designed to monitor and control incoming and outgoing network traffic based on predefined security rules. Acting as a barrier between a trusted internal network and untrusted external networks, such as the internet, a firewall helps protect systems from unauthorized access and cyber threats. It works by inspecting data packets and either allowing or blocking them based on the rules set by administrators. Firewalls can be hardware-based, software-based, or both, and they play a critical role in safeguarding sensitive information and maintaining network integrity.

71

What are some of the challenges faced by penetration testers?

Reference answer

Penetration testers face several challenges, including: - Staying ahead of attackers: Keeping up with new vulnerabilities and attack techniques. - Evolving technologies: Adapting to new technologies and security tools. - Limited resources: Balancing time and resources to effectively conduct tests. - Avoiding false positives: Identifying genuine vulnerabilities and avoiding unnecessary alarms. - Communicating findings effectively: Clearly communicating complex technical information to both technical and non-technical audiences. - Dealing with legal and ethical considerations: Ensuring compliance with relevant laws and ethical guidelines.

72

What is the difference between VA and PT?

Reference answer

Vulnerability Assessment: Vulnerability Assessment is an approach used to find flaws in an application/network, It is like travelling on the surface. Penetration testing: It is the practice of finding exploitable vulnerabilities like a real attacker will do, It is digging for gold.

73

What are some of the most common vulnerability databases?

Reference answer

National Vulnerability Database (NVD), Common Vulnerabilities and Exposures (CVE), Exploit Database, VulDB, Packetstorm, Microsoft Security Bulletins.

74

What is a botnet?

Reference answer

A botnet is a network of infected devices called "bots" or "zombies" all controlled by one attacker through a command-and-control (C2) server. The device owner usually has no idea their machine is part of it. Botnets are used for large-scale DDoS attacks, sending spam, credential stuffing, and spreading malware further. The infamous Mirai botnet, for example, took down major websites by recruiting millions of IoT devices.

75

How can you defend against ARP poisoning attacks?

Reference answer

To defend against ARP poisoning attacks, organizations can implement several key strategies: - Use Dynamic ARP Inspection (DAI): DAI compares ARP packets against trusted IP-to-MAC address bindings. - Implement static ARP entries: For critical systems, manually configure static ARP entries to prevent unauthorized changes to the ARP cache. - Network segmentation: Divide the network into smaller subnets or VLANs to limit the scope of potential ARP attacks. - Employ packet filtering: Use firewalls or intrusion detection systems to identify and block suspicious ARP traffic. - Utilize encryption: Implement protocols like HTTPS and VPNs to encrypt network traffic, making it harder for attackers to exploit intercepted data. - Regular monitoring: Use ARP monitoring tools to detect unusual patterns or unexpected changes in ARP traffic. - Physical security: Control physical access to network infrastructure to prevent unauthorized devices from connecting. - Keep systems updated: Regularly patch and update network devices and operating systems to address known vulnerabilities. - Use port security: Configure switches to allow only specific MAC addresses on each port, preventing attackers from assuming multiple network identities. - Employee training: Educate staff about ARP poisoning risks and best practices for network security.

76

List down the 5 stages of ethical hacking.

Reference answer

- Planning and Reconnaissance - Scanning - Gain Access - Maintaining Access - Analysis and WAF Configuration

77

Which ethical hacking tools are usually discussed and why

Reference answer

Tools like Nmap and Wireshark are common because they show how hackers observe networks traffic patterns and exposed services rather than just guessing.

78

Have You Ever Found a Vulnerability Without Permission?

Reference answer

Correct approach: Do not exploit further, report responsibly, follow disclosure guidelines. Any reckless answer is a red flag.

79

What is Session Hijacking?

Reference answer

Session hijacking is the exploitation of a valid computer session to gain unauthorized access. It can occur through: - Session sniffing - Cross-site scripting - Man-in-the-middle attacks - Malware

80

What are the common techniques for cracking passwords?

Reference answer

Common techniques for cracking passwords include: - Brute Force Attack: Attempting every possible combination of characters until the correct password is found. - Dictionary Attack: Using a precompiled list of common passwords or word lists to guess the password. - Rainbow Table Attack: Using precomputed tables of hash values for faster password cracking by comparing hashed passwords. - Social Engineering: Manipulating individuals to reveal their passwords, often by tricking them into disclosing information. - Phishing: Using fake websites or emails to lure users into entering their credentials. - Keylogging: Installing software to secretly record keystrokes and capture passwords typed by the user. - Hybrid Attack: Combining dictionary attacks with brute force, trying variations of common passwords (e.g., adding numbers or symbols). - Password Hash Cracking: Cracking password hashes by using techniques like brute force or dictionary attacks on the hashed version of the password. These methods exploit weaknesses in password choice, storage, and user behavior to gain unauthorized access.

81

What is a Phishing attack?

Reference answer

Phishing is a type of social engineering attack that involves tricking the user into revealing sensitive information, such as passwords, by posing as a trustworthy entity.

82

What are the differences between risk analysis and penetration testing?

Reference answer

Risk analysis and penetration testing are critical components of a robust cybersecurity strategy, yet they serve distinct purposes and rely on different methodologies. Risk analysis is a strategic process aimed at identifying potential threats, vulnerabilities, and the impact these risks could have on an organization. This process involves evaluating the likelihood of various risks occurring and prioritizing them based on their potential impact. The goal of risk analysis is to provide a comprehensive understanding of an organization's security posture and help decision-makers allocate resources effectively to mitigate identified risks. Penetration testing, on the other hand, is a tactical approach that involves simulating real-world attacks to identify specific weaknesses within a system. By mimicking the techniques used by malicious actors, penetration testing focuses on finding exploitable vulnerabilities in applications, networks, or systems. The primary objective is to assess the effectiveness of existing security measures and provide actionable insights to strengthen defenses. While risk analysis offers a high-level overview of threats and their potential consequences, penetration testing dives deep into technical vulnerabilities to verify and challenge security controls. Both practices are complementary and vital for establishing a comprehensive approach to cybersecurity.

83

What distinguishes banner grabbing from OS fingerprinting?

Reference answer

Banner Grabbing and OS Fingerprinting are both techniques used in network security to gather information about systems. They differ in their methods and the depth of information they provide. Here's a table differentiating them: Aspect | Banner Grabbing | OS Fingerprinting | | Purpose | Identify services and their versions | Identify the operating system of the target | | Method | Capture response/banners from services | Analyze network traffic or send probes to identify OS | | Level of Detail | Basic information (service names, versions) | Detailed information (OS type, version, and configuration) | | Tools Used | Telnet, Netcat, Nmap, curl, etc. | Nmap, Xprobe, p0f, etc. | | Accuracy | Less accurate, based on service banners | More accurate, uses packet analysis or probes | | Speed | Faster, simple request/response process | Slower, requires more in-depth analysis | Banner grabbing is quicker and provides less detailed info, while OS fingerprinting is more comprehensive but requires more time.

84

What is SSL and why is it insufficient for encryption purposes?

Reference answer

SSL, or Secure Sockets Layer, is a form of identity verification, rather than hard encryption. Its purpose is to verify that the person on the other end is who they claim to be. Although SSL and Transport Layer Security (TLS) are widely used online, they are a prime target for attacks, particularly through implementation flaws (e.g., Heartbleed bug) and well-known methodologies. As a result, SSL alone is insufficient for encryption purposes.

85

What is Vulnerability Research?

Reference answer

Vulnerability research is the process of identifying and analyzing security weaknesses in software and systems and taking steps to mitigate them. Techniques used in vulnerability research include code review, static and dynamic analysis, and penetration testing. The ultimate goal is to report vulnerabilities to the vendor or developer of the affected software or system so that they can be fixed.

86

What is an exploit kit?

Reference answer

An exploit kit is a collection of automated scripts that cybercriminals use to target software vulnerabilities and distribute malware.

87

What is a social engineering attack, and how does it work?

Reference answer

A social engineering attack is a type of attack that relies on manipulating individuals into divulging sensitive information or performing certain actions.

88

What attracted you to our company and its culture?

Reference answer

Additional culture fit questions include: - What attracted you to our company and its culture? - What do you value most in a workplace and its culture? - How do you handle failure or setbacks in your work? Can you provide an example?

89

What is a common misconfiguration of FTP and SMB?

Reference answer

Common misconfigurations include anonymous login on FTP (allowing unauthorized file access) and null sessions on SMB (enabling enumeration without authentication).

90

You discover a zero-day vulnerability during a client engagement. How do you handle disclosure?

Reference answer

Follow industry disclosure standards (ISO/IEC 29147). Notify the client confidentially and discuss coordinated disclosure with vendors. Never publicize before responsible parties are informed.

91

What is the role of artificial intelligence (AI) in penetration testing?

Reference answer

AI can be used to automate penetration testing tasks, identify vulnerabilities, and improve the efficiency of penetration testing.

92

What is a penetration test?

Reference answer

A penetration test is a simulated cyber attack against a computer system to check for exploitable vulnerabilities.

93

What is the OSSTMM, and what are its standards?

Reference answer

The OSSTMM (Open Source Security Testing Methodology Manual) is a comprehensive guide to security testing, providing standards and best practices for penetration testing.

94

What skills matter more than tools in ethical hacking

Reference answer

Thinking logically and understanding systems matter more than memorizing tools. Tools change quickly but fundamentals stay useful for years.

95

What is the difference between ethical hacking and malicious hacking?

Reference answer

Ethical hacking is conducted to protect businesses from loopholes and fix them to prevent sensitive data from being misused. Malicious hacking includes penetrating systems without permission to misuse sensitive details regarding the company and its consumers.

96

What is the difference between black box, white box, and gray box testing?

Reference answer

Black box testing has no prior knowledge of the system; white box testing has full knowledge; gray box testing has partial knowledge.

97

What certifications are beneficial for ethical hackers?

Reference answer

Useful certifications include: • Certified Ethical Hacker (CEH) • Offensive Security Certified Professional (OSCP) • GIAC Penetration Tester (GPEN) • CompTIA PenTest+

98

What is the difference between symmetric and asymmetric encryption?

Reference answer

Symmetric encryption uses a single key for both encryption and decryption, making it faster but requiring secure key exchange. Asymmetric encryption uses a pair of keys (public and private), where the public key encrypts and the private key decrypts, providing better security for key distribution but being slower.

99

What is the difference between an IDS and an IPS?

Reference answer

An IDS (Intrusion Detection System) monitors and alerts on suspicious activity but does not take action, while an IPS (Intrusion Prevention System) actively blocks or prevents detected threats.

100

What are the different pentesting methodologies?

Reference answer

- OWASP (Open Web Application Security Project) - NIST (National Institute of Standards and Technology) - PTES (Penetration Testing Execution Standard) - ISSAF (Information Systems Security Assessment Framework) - OSSTMM (Open Source Security Testing Methodology Manual)

101

what is XSS, what types of XSS are there, what are the consequences of a successful attack and how do you prevent XSS?

Reference answer

XSS (Cross-Site Scripting) injects malicious scripts into web pages. Types: Stored (persistent), Reflected (non-persistent), and DOM-based. Consequences include data theft, session hijacking, and defacement. Prevention includes input validation, output encoding, and Content Security Policy (CSP).

102

Explain the concept of privilege escalation?

Reference answer

Privilege escalation is the act of exploiting a vulnerability to gain elevated access to resources that are normally protected. It can be: - Vertical (gaining higher privileges) - Horizontal (gaining same-level privileges of another user)

103

What certifications do you have, and what did you get out of them?

Reference answer

I hold my OSCP, which was honestly one of the most intense learning experiences I've had. It's hands-on, exam-focused, and forces you to think like a penetration tester under pressure. The course isn't just about learning tools; it's about methodology and understanding why exploits work. I also have my CEH, which provided a broader framework of security concepts. I found it useful for understanding the landscape, though I lean more heavily on OSCP for practical skills. I'm currently studying for GPEN through SANS, which I'm pursuing because I want to deepen my expertise in exploit development and evasion techniques. I'm not certification-obsessed—I see them as waypoints in ongoing learning, not destinations. The practical experience matters more than the badge. But certifications force you to fill knowledge gaps and stay disciplined about learning. They're also useful for client confidence; when someone has OSCP, they know you've proven hands-on ability.

104

How do you handle reporting after a Penetration test?

Reference answer

Reporting is a critical part of the Penetration testing process. Reports are structured with an executive summary for non-technical stakeholders and a detailed technical section for the security team. Each vulnerability found is described along with its potential impact and a step-by-step explanation of the exploitation process. Severity ratings based on CVSS scores and actionable remediation recommendations are included to guide fixing issues and mitigating future risks. Tools like an AI Executive Summary Generator can make this process faster by automatically drafting clear and accurate summaries that can be refined by the tester.

105

What are some common penetration testing tools?

Reference answer

Penetration testers use a wide range of tools, including: - Nmap: Network scanner for port and service identification. - Metasploit: Framework for developing and executing exploits. - Burp Suite: Web application security testing tool. - Wireshark: Network packet analyzer. - Kali Linux: Penetration testing distribution with a collection of security tools. - Nessus: Vulnerability scanner. - Aircrack-ng: Wireless network auditing tool.

106

What are major cybersecurity compliances?

Reference answer

Major cybersecurity compliances are regulatory requirements and standards that organizations must follow to protect data and maintain security. These include industry-specific regulations like GDPR for data privacy, PCI DSS for payment card security, HIPAA for healthcare data, and frameworks like ISO 27001 for information security management systems.

107

What is the backdoor when it comes to cybersecurity?

Reference answer

When it comes to cybersecurity, the back door, known as the hidden method of passing standard authentication, is a team network or any type of application. Attackers mainly install back doors to maintain unauthorized access and compromise stems in order to hack data.

108

What is the OWASP Top 10, and why is it important?

Reference answer

The OWASP Top 10 is a list of the most critical web application security risks. Penetration testers need to understand these risks to identify vulnerabilities in web applications.

109

What role does coWPAtty play in ethical hacking?

Reference answer

coWPAtty is a tool used in ethical hacking to test the security of WPA (Wi-Fi Protected Access) networks. It focuses on cracking WPA-PSK (Pre-Shared Key) passwords by using dictionary or brute-force attacks. Ethical hackers use coWPAtty to assess the strength of Wi-Fi network passwords and identify weak or easily guessable keys. The tool works by capturing the handshake between a client and the access point, then attempting to crack the password offline using pre-compiled or custom wordlists. Its role is to help identify vulnerabilities in wireless networks and improve overall network security by encouraging stronger password practices.

110

What is HIPAA?

Reference answer

HIPAA (Health Insurance Portability and Accountability Act) - HIPAA is a US federal law protecting sensitive patient health information from disclosure without consent or knowledge, applying to covered entities (healthcare providers, health plans, healthcare clearinghouses) and their business associates. The Security Rule requires administrative, physical, and technical safeguards including access controls, encryption, audit logs, and workforce training, while the Privacy Rule governs use and disclosure of Protected Health Information (PHI). Organizations must conduct risk assessments, implement security measures appropriate to their size and complexity, maintain business associate agreements, and report breaches affecting 500+ individuals within 60 days. Violations can result in civil penalties from $100 to $2 million per violation type per year, and criminal penalties including imprisonment for knowingly obtaining or disclosing PHI.

111

Can you describe the different phases of a typical penetration testing engagement?

Reference answer

The phases and the order in which they are done can differ depending on who you talk to. In general, these are the phases of a penetration test, many of which will be repeated as the test progresses: - Pre-engagement - Information gathering - Vulnerability assessment (as a phase built-in to the pentest) - Exploitation - Post-exploitation - Lateral movement - Post-engagement During the pre-engagement phase, all of the important work (not as exciting) is done to ensure all relevant parties understand and document the details and expectations of the test. At the information-gathering phase, the test and fun begins. This is where I start doing open source intelligence (OSINT) and enumerating hosts, the network, and any reachable services. I will be documenting any promising findings that the client should know about, like: - Unexpected services and IP subnets that are reachable. - Secrets found in public-facing GitHub repos, AWS S3 buckets, and other cloud storage technologies. - Social media activity from employees that may reveal what technologies are used at the company (commonly found on job descriptions). - A visual network diagram to assist me in enumeration and discovery throughout the engagement. At the vulnerability assessment stage, I start using the information we gathered to determine if there are any vulnerabilities present that can be exploited. I might start looking up known vulnerabilities based on service and software versions, noting any CVEs, finding proof of concept exploits (PoCs), and carefully planning the attack attempts. At the exploitation phase, I'll perform the attack and/or series of planned attacks to attempt to exploit any vulnerabilities. If I have been brought on to test an environment externally and internally, I will be attempting to exploit a vulnerable public-facing system to see if the vulnerability will allow me to pivot from that external-facing system onto internal IT infrastructure. There are some companies that still host their own websites on-prem in a DMZ, but it is more common for companies to use 3rd party website hosting services or cloud providers for website or web application hosting. If the engagement calls for me to test from the internal perspective, my contact will provide me with remote access via virtual private network (VPN) or even use an attack VM that gets spun up somewhere on their internal network environment. Regardless, I will document each attack I attempt (successful and unsuccessful), including the date and time for full transparency. In the post-exploitation phase, I will check to see what kind of privileges the account I landed on has. If it is a Windows system I'll run a series of commands to live off the land, discover interesting files, and find potential pathways for privilege escalation, including but not limited to: - whoami /priv - ipconfig /all - netstat -antp - arp -a - Systeminfo - wmic qfe get Caption, Description, HotFixID, InstalledOn I'll also look for any interesting files on the system using a series of search-centric commands and scripts (example: WinPEAS) that are configured to look in common directories using keywords that may find files containing sensitive information. Depending on how secure the environment is, I may choose not to run any type of pre-made scripts to attempt to avoid any potential detections. That said, I understand that it isn't always bad to get detected as a tester. It helps the organization see what they are doing right as well, I just wouldn't want the engagement to end too soon ?. At the lateral movement phase, I will use information gathered from what I did in post-exploitation to determine if I can—and how I should—try to move laterally to another system on the network. Lateral movement and post-exploitation are very closely related, as are all the phases. This may mean that I discover the Windows system I land on is part of a Windows domain, and I try to harvest domain user credentials that I could use to remotely access another system on the network through WinRM. During the post-engagement phase, the report will be prepped to be delivered to the client. I would, of course, use whatever template our company uses to remain in line with our quality standards, operational practices, and style. As a team, we may come together to discuss the scoring of each vulnerability to communicate impact and prioritize mitigation based on severity. We would also work with the client to schedule a time when we can discuss our findings with all the relevant stakeholders.

112

What Is Your Process During Penetration Testing?

Reference answer

Penetration testing begins with planning and reconnaissance to gather information. The next step involves scanning and exploiting vulnerabilities through various attack techniques. After gaining access, testers maintain access to evaluate system weaknesses. The final stage involves reporting findings and suggesting solutions to improve security and reduce risks.

113

How do you craft a convincing phishing email?

Reference answer

Look for: Attention to detail. What to Expect: Explanation of the elements of a successful phishing email, including personalized content, urgent language, and credible-looking sources.

114

What is Nessus, and how does it work?

Reference answer

Nessus is a vulnerability scanner that helps penetration testers identify potential vulnerabilities in systems.

115

Do you have a favorite hacker/blogger/YouTuber?

Reference answer

It is important to keep up to date with the latest trends in security and technology so that you are not left behind in the ever-evolving cyber world. You can stay up to date by following tech influencers on social media, Youtube, or on their blogs. Check out The Best Cyber Security Podcasts for You and The Top 15 Cyber Security Blogs to Start Reading Today for some great sources to follow.

116

How do attackers bypass switch restrictions?

Reference answer

Attackers can bypass switch restrictions using several techniques: - MAC Flooding: Attackers flood the switch with fake MAC addresses, causing it to broadcast traffic and allowing interception. - VLAN Hopping: Attackers manipulate VLAN tags to bypass network segregation and access restricted areas. - STP Manipulation: Forged STP packets reroute traffic, potentially causing DoS or redirecting it to a compromised device. - DHCP Spoofing: Attackers impersonate a DHCP server, assigning malicious IP addresses to redirect traffic or launch man-in-the-middle attacks. - Port Security Bypass: Weaknesses in MAC address binding allow attackers to bypass port security and gain network access. By exploiting these techniques, attackers can gain unauthorized access to network resources and compromise the security of the switch and connected devices.

117

How would you rate vulnerabilities during a penetration test?

Reference answer

In order to rate a vulnerability, a risk matrix is used and a risk level is calculated based on the likelihood and consequence of a given issue.

118

What is SQL injection, and how can it be prevented?

Reference answer

SQL injection is a code injection technique that exploits vulnerabilities in an application's software, allowing attackers to interfere with the queries an application makes to its database. It can be prevented by using prepared statements, parameterized queries, and input validation.

119

What is Burp Suite? What tools does it contain?

Reference answer

Burp Suite is an integrated platform used for attacking net applications. It contains all the tools a hacker would need for attacking any application. a number of these functionalities are: Proxy, Spider, Scanner, Intruder, Repeater, Decoder, Comparer, Sequencer.

120

Differentiate between a vulnerability and an exploit.

Reference answer

You need a strong understanding of cyber security fundamentals to succeed as a penetration tester. These questions uncover if you have this fundamental knowledge, and you should be able to answer both easily. If not, consider taking an entry-level cyber security certification that teaches this knowledge, such as CompTIA's Security+. For more information, read What Is CompTIA Security+? An Essential Guide.

121

What is packet inspection?

Reference answer

Packet inspection examines network packets' contents and headers, either shallow (checking headers) or deep (analyzing payloads), for security monitoring or threat detection.

122

Can you explain a situation where you found a critical vulnerability? How did you report and resolve it?

Reference answer

Use the STAR method (Situation, Task, Action, Result). Focus on technical investigation, clear documentation, and communication with stakeholders.

123

What is SQL injection?

Reference answer

SQL injection is a code injection technique that exploits vulnerabilities in data-driven applications. Attackers insert malicious SQL code into input fields, bypassing security measures and potentially gaining unauthorized access to sensitive data or manipulating database operations.

124

How important is Linux knowledge for ethical hackers

Reference answer

Linux appears in servers security tools and testing environments frequently. Comfort with Linux saves time and reduces mistakes during assessments.

125

What ethical considerations do you keep in mind when performing social engineering tests?

Reference answer

When performing social engineering tests, it is crucial to adhere to strict ethical guidelines to protect the rights and privacy of individuals. Consent from the organization, often in the form of a signed agreement, must be obtained prior to conducting any tests. Testers should avoid exploiting sensitive personal information or causing undue stress to employees. Clear boundaries must be established to ensure that no harm—whether psychological, reputational, or legal—is inflicted during the test. Additionally, the test outcomes should be communicated respectfully and constructively, with a focus on improving security measures rather than assigning blame. Conducting these tests with integrity and professionalism not only ensures compliance but also builds trust between the testing team and the organization.

126

What is "cryptojacking"?

Reference answer

Cryptojacking is a cyberattack where attackers hijack a victim's computer resources to mine cryptocurrency without their knowledge or consent. This uses the victim's CPU and GPU to generate cryptocurrency for the attacker's benefit.

127

What tools would you use to scan a network for known vulnerabilities?

Reference answer

Tools for vulnerability scanning include Nessus, OpenVAS, and Qualys.

128

Types of Penetration Testing

Reference answer

Black Box Testing: No prior knowledge provided. Simulates external attacker. White Box Testing: Full access provided: source code, architecture, credentials. Simulates insider or deep audit. Gray Box Testing: Partial knowledge provided. Most common in corporate engagements.

129

Web App Has File Upload Functionality

Reference answer

Testing approach: File type restrictions, double extensions (.php.jpg), MIME type bypass, magic byte manipulation, web shell upload, reverse shell execution. Then escalation: Privilege escalation, persistence, pivoting internally.

130

What is malware analysis in ethical hacking

Reference answer

Malware analysis studies malicious code behavior to understand damage potential and improve detection methods.

131

Describe the steps involved in a penetration testing process.

Reference answer

The penetration testing process begins with planning and reconnaissance, where information about the target is gathered. This is followed by scanning to identify potential entry points, and finally, exploitation to attempt unauthorized access.

132

How does penetration testing support PCI-DSS compliance?

Reference answer

Penetration testing is a required component of PCI-DSS compliance, helping organizations identify and remediate vulnerabilities to protect cardholder data.

133

What is SQL Injection, different types and examples, how to prevent ?

Reference answer

SQL Injection inserts malicious SQL queries into input fields. Types: in-band (error-based, union-based), blind (boolean-based, time-based), and out-of-band. Example: ' OR 1=1 --. Prevention: parameterized queries, stored procedures, input validation, and escaping.

134

What is the OWASP Top 10?

Reference answer

The OWASP Top 10 is a list of the most critical web application security risks.

135

What are common types of cyber-attacks and how can they be prevented?

Reference answer

Common types of cyber-attacks include malware, phishing, denial-of-service attacks, and SQL injection attacks. They can be prevented by implementing strong security measures, such as using anti-virus software, training employees on how to identify phishing emails, and using secure coding practices.

136

What is a vulnerability assessment?

Reference answer

Vulnerability assessment is the process of scanning and identifying potential vulnerabilities in a system without exploiting them. This helps prioritize security issues for remediation.

137

Describe a Time When You Discovered a Critical Vulnerability. How Did You Handle It?

Reference answer

This question assesses problem-solving skills and experience. A good response will include a specific example, the steps taken to address the vulnerability, and the outcome. It should also highlight communication skills and the ability to work under pressure.

138

Why are logs important during ethical hacking assessments

Reference answer

Logs help track suspicious activity and confirm whether attacks succeeded or failed which supports accurate reporting.

139

What is OWASP? Give some examples of OWASP's top 10 web vulnerabilities?

Reference answer

OWASP is an Open Web Application Security Project. OWASP is an organization that specializes in improving the security of web applications. The organization maintains a comprehensive database of vulnerabilities and attacks and frequently releases advisories to warn developers about specific security threats. The Top 10 web vulnerabilities are some of the most commonly exploited vulnerabilities, and many other vulnerabilities exist that are less commonly exploited. These top 10 vulnerabilities are given below: - Broken Access Control - Cryptographic Failure - Injection - Insecure Design - Security Misconfiguration - Vulnerable and Outdated Components - Identification and Authentication Failure - Software and Data integrity Failure - Security Logging and Monitoring Failure - Server-Side Request Forgery

140

What is CVSS?

Reference answer

CVSS is a standardized framework for rating the severity of security vulnerabilities on a scale from 0.0 to 10.0. It evaluates vulnerabilities based on three metric groups: Base (intrinsic qualities), Temporal (time-dependent factors), and Environmental (user-specific impacts). CVSS scores help organizations prioritize remediation efforts by categorizing vulnerabilities as Low (0.1-3.9), Medium (4.0-6.9), High (7.0-8.9), or Critical (9.0-10.0).

141

Tell me about a time you had to learn a new tool or technology quickly.

Reference answer

I was assigned to test a client's API gateway, which was built with a technology I'd never worked with before. Rather than panicking, I broke it down: I needed to understand what the technology does, common vulnerabilities in that space, and tools that interact with it. I spent a weekend working through documentation and setting up a test environment locally. I also found a conference talk from a security researcher who'd done similar testing. The testing itself drew on skills I already had—understanding authentication mechanisms, finding injection points, testing authorization—but applied to this specific technology. I think the ability to quickly get up to speed on new technologies is one of the most valuable skills in penetration testing.

142

What is the difference between encoding, hashing and encrypting?

Reference answer

Encoding transforms data for usability (e.g., Base64) and is reversible without a key. Hashing produces a fixed-size output that is one-way and used for integrity. Encryption secures data using a key, and is reversible with the correct key.

143

How does Kerberos authentication work in Active Directory?

Reference answer

Kerberos, as opposed to an authentication system like NTLM, uses third-party verification (the Key Distribution Center) and stronger encryption that makes Kerberos more secure compared to NTLM alone. Steps to authenticate with Kerberos: 1. Client requests an authentication ticket (TGT) from the Key Distribution Center (KDC) 2. The KDC verifies the credentials and sends back an encrypted TGT and session key 3. The TGT is encrypted using the Ticket Granting Service (TGS) secret key 4. The client stores the TGT and when it expires the local session manager will request another TGT (this process is transparent to the user) If the client is requesting access to a service or another resource on the network: 5. The client sends the current TGT to the TGS with the Service Principal Name (SPN) of the resource the client wants to access 6. The KDC verifies the TGT of the user and that the user has access to the service 7. TGS sends a valid session key for the service to the client 8. Client forwards the session key to the service to prove the user has access, and the service grants access.

144

How do you handle false positives during a penetration test?

Reference answer

Handling false positives during a penetration test requires a methodical approach to ensure accurate assessment and reporting. First, all potential vulnerabilities identified by automated tools should be manually verified to confirm their validity. This involves replicating the issue and analyzing the system's responses to determine whether it poses a genuine risk. Clear documentation of the testing process and results is essential to differentiate between actual vulnerabilities and false positives. Additionally, ongoing communication with the client or system administrators allows for clarification and context, which can help in confirming the authenticity of findings. By rigorously validating results, testers ensure that resources are focused on addressing real security threats.

145

Write a SQL query to find users who have not logged in for the last 30 days.

Reference answer

Look for: Proficiency in SQL and understanding of date functions. SELECT username FROM users WHERE last_login < DATE_SUB(NOW(), INTERVAL 30 DAY);

146

What is the Cloud Security Alliance, and what are its guidelines?

Reference answer

The Cloud Security Alliance is a non-profit organization that provides guidelines and best practices for cloud security. Its guidelines include the Cloud Controls Matrix and the Security, Trust & Assurance Registry.

147

What are the different types of spoofing?

Reference answer

There are several types of spoofing attacks that ethical hackers may be familiar with, including: - IP spoofing: This involves altering the source address of a packet or message so that it appears to have originated from a different device or network. - Domain name system (DNS) spoofing: This type of attack involves altering the mapping of domain names to IP addresses so that users are redirected to a different website than the one they intended to visit. - Email spoofing: This involves sending emails that appear to be from a legitimate source, but are actually fraudulent. - Mac spoofing: This involves altering the MAC (media access control) address of a device so that it appears to be a different device. - ARP spoofing: This involves altering the ARP (address resolution protocol) cache on a network, so that network traffic is redirected to a different device. - GPS spoofing: This involves altering GPS signals so that they appear to be coming from a different location than their actual source. Ethical hackers may encounter these types of spoofing attacks as they test the security of a system or network and work to identify and address vulnerabilities.

148

How Do You Use Metasploit in Engagements?

Reference answer

A strong answer structure: Import scan results, search exploits, configure payloads, set RHOST/LHOST, launch exploit, gain shell, post-exploitation modules. Bonus mention: Meterpreter capabilities, pivoting, privilege escalation modules.

149

What is the first thing you should do before testing begins?

Reference answer

You will be expected to know the fundamental steps of a penetration test, how to perform each technically, and how to communicate these steps to a non-technical audience. This question lets you list these steps and describe why they are important. To answer this question, read Penetration Testing Steps: A Comprehensive Assessment Guide.

150

Explain the TCP 3-Way Handshake

Reference answer

A strong answer: SYN – Client initiates connection SYN-ACK – Server acknowledges ACK – Client confirms Connection established → data transfer begins. Why interviewers ask this: To ensure you understand port scanning logic, firewall evasion, packet crafting, and session establishment.

151

Describe a situation where you had to work with a difficult client or team member on a security issue.

Reference answer

I was testing a company where one of the infrastructure engineers was skeptical of my findings. I'd found a misconfigured AWS S3 bucket exposing 500GB of data, and he insisted it was secure because it wasn't publicly accessible in their mind. Rather than arguing about my credentials, I calmly showed him the exact steps anyone could take to enumerate and access the bucket. I didn't just say 'it's open'—I explained the business implications: 'This isn't theoretical. The data is accessible, and here's the proof.' I also made sure to frame it as 'let's solve this together' rather than 'you messed up.' By the end, he was as concerned as I was, and we worked together to restrict access and implement better monitoring. The key was staying calm and treating it as a problem to solve together, not a battle to win.

152

What is the difference between encryption and hashing?

Reference answer

Encryption: Encryption is reversible, Encryption ensures confidentiality. Hashing: Hashing is irreversible, Hashing ensures Integrity.

153

Explain to me what a brute-force attack is and how you can avoid it or mitigate it.

Reference answer

A brute-force attack is when a hacker attempts to uncover a target's password using a permutation or fuzzing process. This type of attack takes a long time and process. And it's because of that, that attackers use software such as Hydra or Fuzzer to automate the password creation process. To prevent a brute force attack, you'll need to carry out one or more of the following options: 1) Use strong passwords for your public server or web app: Include numbers, small and capital letters, and special characters to create a long and strong password. 2) Limit the number of login attempts: Either use a plugin to reduce the number of logins allowed per user. If users add their password incorrectly two or three times, they'll be banned from accessing their account for some time. 3) Keep an eye on IP addresses: This can be considered an extension of point #2. Monitoring IP addresses allows you to see where potential hackers for a brute force attack are coming from. It also indicates suspicious activity. This step is important for businesses whose employees work remotely. 4) Use two-factor authentication: You'll notice that many social media apps are beginning to rely on this add-security method. Google is one of those websites that uses a two-factor authentication method for when you log in for the first time via a new browser. 5) Use CAPTCHAs: An acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart," a CAPTCHA is a challenge that involves clicking certain images or writing certain letters and numbers to indicate that the person on the other end is, in fact, a person and no AI.

154

Your initial penetration test proposal is heavily criticized by your manager. How have you adapted to negative feedback in the past?

Reference answer

Additional behavioral questions include: - Your initial penetration test proposal is heavily criticized by your manager. How have you adapted to negative feedback in the past? - Describe a situation where you were able to use persuasion to successfully convince someone to see things your way. - Can you think of a situation where innovation was required at work? What did you do in this situation?

155

What is Keylogger Trojan in Ethical Hacking?

Reference answer

A keylogger Trojan is a type of malicious software that is designed to record and transmit the keystrokes that a user types on their computer. This includes login credentials, passwords, and other sensitive information. The keylogger Trojan works by monitoring the user's keystrokes and logging them to a file, which is then sent off to the attacker. This can allow the attacker to gain access to a user's accounts and steal sensitive information. Keylogger Trojans are often used by cybercriminals as part of larger cyber attacks, such as phishing campaigns or malware infections. They are particularly dangerous because they can operate in the background, without the user's knowledge or consent. This makes it difficult for users to detect and protect against them. There are several ways that users can protect themselves against keylogger Trojans. One of the most effective methods is to use a reputable antivirus program that is capable of detecting and blocking keyloggers. Users should also be cautious when clicking on links or downloading files from unknown sources, as these are common vectors for keylogger Trojans. In addition, users should be sure to regularly update their operating systems and applications, as many keylogger Trojans take advantage of vulnerabilities in out-of-date software. Overall, keylogger Trojans are a serious threat to both individuals and organizations. It is important for users to be aware of the risks and take steps to protect themselves against these types of attacks. By following best practices for online security and staying vigilant, users can help to reduce the risk of falling victim to keylogger Trojans and other cyber threats.

156

Do you know about the thing called session hijacking?

Reference answer

When attackers compromise active session tokens and feed user data without having the log in information, they are session hijacking.

157

What is John the Ripper, and how does it work?

Reference answer

John the Ripper is a password-cracking tool that helps penetration testers crack passwords using dictionary, brute-force, and rainbow table attacks.

158

What is SQL injection and its types?

Reference answer

If the application doesn't sanitize the user input then the SQL injection happens. Thus a malicious hacker would inject SQL queries to gain unauthorized access and execute administration operations on the database. SQL injections may be classified as follows: Error-based SQL injection, Blind SQL injection, Time-based SQL injection.

159

What's the difference between black box, white box, and grey box testing?

Reference answer

Black box: Tester has no prior knowledge of the target system; simulates an external attack. White box: Tester has full information (source code, architecture, credentials); simulates an internal threat or trusted insider. Grey box: Partial knowledge is provided; mimics an attacker with some inside access. Interview tip: Be ready to discuss the pros, cons, and use-cases for each approach!

160

Describe your experience with privilege escalation.

Reference answer

Privilege escalation is usually the key step between gaining access and actually compromising a system. I approach it systematically by first understanding what I have access to and what the target system is running. On Windows, I use tools like Sherlock or WinPrivEsc scripts to automate initial discovery of misconfigurations—unquoted service paths, weak registry permissions, scheduled tasks running as high privileges. I also look manually because automated tools miss context-specific issues. I've found privilege escalation through SQL Server database links, through stored credentials in the registry, and through DCOM objects with elevated permissions. On Linux, I check for common issues like sudo misconfiguration, capabilities on binaries, SUID binaries with known exploits, and kernel vulnerabilities. I also use scripts like LinPEAS to automate discovery. What's important is understanding the 'why' behind each escalation technique. If I find that a service is running as SYSTEM and I can write to its executable, I understand that I can replace the executable and execute arbitrary code at SYSTEM level when the service restarts. That understanding helps me spot similar patterns across different systems.

161

What are the different types of hackers?

Reference answer

White Hat: Ethical hackers who work legally and with permission Black Hat: Malicious hackers who break in for personal gain or damage Grey Hat: Somewhere in between; they may hack without permission but don't cause damage, sometimes reporting vulnerabilities afterward

162

What is Penetration Testing?

Reference answer

Penetration testing, often referred to as pen testing, is a simulated cyberattack on a computer system, network, or application, performed to identify vulnerabilities that could be exploited by attackers. This security assessment is conducted by ethical hackers who use a variety of tools and techniques to probe for weaknesses in the system's defenses. By identifying flaws before malicious attackers can exploit them, penetration testing plays a critical role in proactive cybersecurity strategies.

163

What is the difference between a black box, white box, and grey box penetration test?

Reference answer

A black box test is a simulation of an attack from an external attacker, a white box test is a comprehensive review of an application's source code, and a grey box test is a combination of black box and white box testing.

164

What is the OSI model, and why is it important in cybersecurity?

Reference answer

The OSI (Open Systems Interconnection) model is a framework that categorizes network functions into seven layers (from Physical to Application). Understanding these layers helps cybersecurity professionals identify where specific security measures should be applied and how attacks might exploit each layer.

165

Why is privilege escalation dangerous

Reference answer

Escalating privileges enables an attacker to go from having restricted access, to gaining permanent administrative control, and ultimately compromising the whole machine.

166

What do you mean by dumpster diving?

Reference answer

Dumpster diving describes the practice used for retrieving information, computer data, or other confidential information, by searching through waste receptacles that are not intended for public inspection. Dumpster diving can be done legally or illegally. However, it is most commonly conducted illegally. Dumpsters are often placed near businesses in order to collect discarded material from employees and customers who have left their personal belongings behind as they leave work. This material may include files containing private information such as credit card numbers and login credentials for online accounts.

167

What tools would you use for network scanning?

Reference answer

Common network scanning tools include: - Nmap for port scanning and service detection - Wireshark for packet analysis - Nessus for vulnerability scanning - Metasploit for exploitation - Burp Suite for web application testing

168

What's your experience with network penetration testing and lateral movement?

Reference answer

I've done plenty of network testing, and lateral movement is often where the real damage happens. After initial compromise, I focus on enumeration—understanding the network topology, identifying trust relationships between systems, and finding weak points. I use tools like Bloodhound for Active Directory environments; it visualizes attack paths and helps identify high-value targets. I'm comfortable with privilege escalation techniques on both Windows and Linux. On Windows, I often look for unquoted service paths, weak registry permissions, or stored credentials. On Linux, I check for sudo misconfiguration, SUID binaries, and kernel exploits. I've learned that lateral movement rarely happens through one dramatic exploit; it's usually a series of smaller steps—finding a shared credential, exploiting a trust relationship, using default passwords on admin tools. I document the entire attack chain carefully because that's what the client needs to understand—not just that I got in, but the path I took and which controls could have stopped me at each stage.

169

What is a firewall? How does it work?

Reference answer

A firewall is a network security device or software that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It works by inspecting packets and deciding whether to allow or block them based on factors like source/destination IP addresses, port numbers, and protocols.

170

What is HIPAA, and what are its security requirements?

Reference answer

HIPAA (Health Insurance Portability and Accountability Act) is a regulation that requires healthcare organizations to protect electronic protected health information (ePHI).

171

What is Spoofing in network attacks?

Reference answer

Spoofing attacks involve forging the source address of a network packet to trick the target into thinking the packet is coming from a trusted source.

172

Secure and HTTPOnly flags

Reference answer

The Secure flag ensures cookies are only sent over HTTPS, preventing interception. The HTTPOnly flag prevents client-side scripts from accessing cookies, mitigating XSS attacks.

173

What is the difference between Ethical Hacking and Cybersecurity?

Reference answer

Ethical Hackers perform Ethical Hacking to assess and provide a report based on the insights gained during the hack. Cyber Security is managed by Cyber Security experts whose responsibility is to defend the system from malicious activities and attacks.

174

What is brute force attack and when does it succeed

Reference answer

A brute force attack works by trying many password combinations. It usually succeeds when weak passwords or no lockout policies are in place.

175

What Is Cross-Site Scripting (XSS)?

Reference answer

Cross-site scripting (XSS) is a web vulnerability where attackers inject malicious scripts into web pages. It allows hackers to steal sensitive data, hijack user sessions, and manipulate website content. Implementing input validation, sanitizing user inputs, and applying security filters prevent XSS attacks.

176

What is Hijacking Execution in pen testing?

Reference answer

Hijacking execution in penetration testing involves taking control of an active session or process within a system to simulate a real-world attack. This technique allows testers to identify vulnerabilities that could enable attackers to execute unauthorized commands, manipulate processes, or escalate privileges within the target environment.

177

What is a Physical Attack?

Reference answer

This type of attack involves physically accessing a device or computer to steal or damage data.

178

What is ARP Poisoning?

Reference answer

ARP poisoning is a Man-in-the-Middle (MITM) attack where an attacker sends fake ARP replies, associates their MAC with victim IP, and intercepts traffic. Used for credential sniffing, session hijacking, and traffic manipulation. Tools example: Ettercap, Bettercap, Arpspoof.

179

What are some typical ports to concentrate on when conducting a Penetration test?

Reference answer

- FTP (port 20 & 21) - HTTP (port 80) - HTTPS (port 443) - NTP (port 123) - SMTP (port 25) - SSH (port 22) - Telnet (port 23)

180

What are the types of hackers?

Reference answer

- White Hat Hackers (Ethical Hackers) – Work legally to protect systems. - Black Hat Hackers (Crackers) – Hack systems illegally for malicious purposes. - Grey Hat Hackers – Hack without permission but report vulnerabilities later.

181

How would you handle discovering a SQL injection vulnerability in a client's database?

Reference answer

You document the SQL injection vulnerability and explain how it could be exploited without compromising actual data. You advise the client to implement parameterized queries, validate inputs, and follow secure coding practices. After remediation, you retest to ensure the vulnerability is fixed. You also suggest monitoring the database for unusual activity and conducting periodic security checks to prevent future issues.

182

Name some steganography technologies used in system hacking?

Reference answer

Steganography technology is used in system hacking for different reasons such as hiding malicious files, making viruses, and causing mischief by modifying the content of seemingly infected documents. There are different types of steganography technologies given below: - Text Steganography - Audio Steganography - Video Steganography - Image Steganography - Network Steganography

183

What is the real difference between active and passive reconnaissance

Reference answer

Passive reconnaissance is quiet and indirect while active reconnaissance talks to the target system. One focuses on staying invisible and the other focuses on getting accurate live responses.

184

What is a Red Team in cybersecurity?

Reference answer

A red team is a group of security experts who simulate the tactics, techniques, and procedures of real-world attackers to test an organization's security defenses and identify weaknesses. The goal of a red team is to identify security gaps before attackers do and help organizations improve their overall security posture.

185

What is "public key infrastructure (PKI)"?

Reference answer

Public key infrastructure (PKI) is a system that uses digital certificates to manage and verify identities for users and devices. It provides a secure and trusted way to establish and verify digital identities, enabling secure communication and data exchange.

186

What is SQL injection in Ethical Hacking?

Reference answer

SQL injection is a technique used by attackers to steal sensitive data from organizations. It involves injecting malicious content into a SQL query string, which can alter the syntax of the query in unintended ways. This technique exploits a flaw in the application code, which allows the attacker to gain unauthorized access to the database and potentially extract sensitive information. SQL injection attacks can be launched through a variety of vectors, such as web forms, search fields, and URLs. They can be difficult to detect, as they often involve manipulating legitimate queries in subtle ways. For example, an attacker might inject a piece of code into a login form that allows them to bypass the authentication process and gain access to the system. To prevent SQL injection attacks, it is important to properly validate and sanitize user input. This can involve using prepared statements and parameterized queries, which help to ensure that only valid data is inserted into the database. It is also important to keep application and database software up to date with the latest patches and security updates. Overall, SQL injection is a serious threat to organizations and can lead to the theft of sensitive data, financial losses, and damage to reputation. Implementing effective security measures is essential to protect against these types of attacks.

187

How do you tailor your approach for cloud, containers, or CI/CD environments?

Reference answer

Mention tools (ScoutSuite, Prowler, kube-hunter), understanding of IAM misconfigurations, API security, and pipeline vulnerabilities. Discuss the need for specialized knowledge in cloud/network architecture.

188

How do you approach social engineering as part of a penetration test?

Reference answer

Social engineering is often the path of least resistance. When I'm authorized to include it in scope, I approach it carefully and ethically. I might craft a phishing email based on the client's industry—something that looks legitimate but contains a link to a test infrastructure I control. I track who clicks and who enters credentials. I also might do pretexting—calling IT as a new employee with a password reset request. I've been surprised how often it works. The key is that this is always in scope with clear rules of engagement, and I always test with the client's explicit permission. I never target individuals in ways that could cause permanent embarrassment or harm. And I always report back with specific guidance on how to reduce human risk—training is important, but so is building systems and processes that assume people will make mistakes. For instance, MFA defeats most credential harvesting attacks regardless of how convincing the phishing email is. I focus on findings that are actionable; it's not just 'your employees clicked a link,' it's 'implement MFA and your risk from phishing drops significantly.'

189

What tools would you use to inspect network packets?

Reference answer

Tools for inspecting network packets include Wireshark, tcpdump, and TShark.

190

Describe how you would prevent session hijacking?

Reference answer

Here are some tips and advice to protect against session hijacking: - We can use Content security policy ( CSP ) and Cross-site Scripting protection headers. - We can use directive HTTP only for session cookies and by avoiding cookie reuse. - We can use server-side cookie invalidation on logout. - By using HTTPS and HSTS on any website. - By using anti-CSRF( Cross-site request forgery) tokens on sensitive actions

191

What are some of the best practices for penetration testing?

Reference answer

Following best practices can enhance the effectiveness and efficiency of penetration testing: - Clearly define the scope and objectives: Determine the target systems, testing methodologies, and desired outcomes. - Obtain explicit consent: Conduct tests only with the client's informed consent. - Respect privacy and confidentiality: Avoid unnecessary disruption to user activities and maintain confidentiality of test findings. - Use a structured methodology: Follow a recognized penetration testing framework or standard. - Prioritize vulnerabilities: Focus on the most critical vulnerabilities and prioritize remediation efforts. - Document findings thoroughly: Provide detailed reports with clear recommendations for remediation. - Communicate effectively: Clearly communicate test results and recommendations to stakeholders.

192

How do students benefit from cybersecurity conferences?

Reference answer

Students benefit from cybersecurity conferences by gaining exposure to cutting-edge research, real-world attack scenarios, and industry best practices not typically covered in academic curricula. These events provide opportunities to learn from experts, discover new tools, participate in capture-the-flag competitions, network with potential employers, and understand current industry trends. Many conferences offer student discounts or free community events, making them accessible learning platforms.

193

What's a denial of service (DOS) attack and what are the common forms?

Reference answer

DOS attacks involve flooding servers, systems, or networks with traffic to cause over-consumption of victim resources. This makes it troublesome or not possible for legitimate users to access or use targeted sites. Common DOS attacks include: [content not fully provided in source]

194

How does encryption work in HTTPS?

Reference answer

- HTTPS uses TLS to encrypt data transmitted between your browser and the web server to secure your web traffic. - A TLS Handshake starts, during which, the browser and web server negotiate encryption algorithms(cipher suites and max TLS version) and exchange keys. - The web server verifies it's identity by providing the browser with a digital certificate, containing information about the website but most importantly the certificates public key and digital signature. - The browser checks if it can trust the digital certificate using a Certificate Authority, completing the TLS Handshake. - Then the browser and the web server agree on a symmetric key using the servers public/private (asymmetric encryption) keys. - Finally the HTTP data can be exchanged between browser and web server using this symmetric encryption, securing the web traffic.

195

What is cloud penetration testing?

Reference answer

Cloud penetration testing evaluates the security of cloud infrastructure, configurations, and services.

196

What is a firewall and how does it work?

Reference answer

A firewall is a network security device that has the ability to either monitor or filter incoming or outgoing network traffic based on pre-defined rules.

197

What is the impact of a Directory Traversal Attack?

Reference answer

A Directory Traversal Attack can have severe consequences for an organization, including unauthorized access to sensitive data, system compromise, and information disclosure. Attackers can potentially read, modify, or delete critical files, causing system outages or corrupting data. This vulnerability can also facilitate further attacks by exposing system architecture details or credentials. The impact can range from minor information leaks to complete system takeover. It can also potentially result in significant financial losses, compliance violations, and long-term security threats if attackers establish persistent access.

198

What is Cross-Site Scripting (XSS)?

Reference answer

Cross-Site Scripting (XSS) is a type of security vulnerability that occurs when an attacker injects malicious scripts into trusted websites. These scripts are then executed in the browser of a user who visits the compromised site, allowing attackers to steal sensitive information, manipulate web content, or hijack user sessions. XSS typically exploits weaknesses in a website's handling of user input, enabling the injection of unauthorized code. It can be classified into three main types: Stored XSS, Reflected XSS, and DOM-based XSS. To prevent XSS, developers should implement proper input sanitization, use Content Security Policies (CSP), and encode output to ensure user input is not executed as code.

199

During a penetration test, you discover a lack of data protection around a company's cryptographic keys and can steal these keys. How could you exploit these keys to access other network devices or cloud services?

Reference answer

Additional problem solving questions include: - How would you try to bypass an intrusion detection system you encounter on a penetration test? - Where would you got to find out if a software you encounter has any security vulnerabilities you can exploit? - During a penetration test, you discover a lack of data protection around a company's cryptographic keys and can steal these keys. How could you exploit these keys to access other network devices or cloud services?

200

What is zero-day exploitation, and how can organizations protect against it?

Reference answer

Zero-day refers to an undiscovered vulnerability that hackers exploit before a patch is available. Regular security updates, intrusion detection systems, and monitoring are vital for zero-day defense.

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