Most Common Interview Questions for Pen Testers

1

What is the difference between bruteforce and dictionary attacks?

Reference answer

Brute-force attacks try all possible combinations of characters, while dictionary attacks use a precompiled list of common passwords or phrases, making dictionary attacks faster but less comprehensive.

2

How can an ethical hacker stay up-to-date with the latest hacking techniques and security threats?

Reference answer

To stay up-to-date with the latest hacking techniques and security threats, it is important to regularly read industry publications, attend conferences and training sessions, and participate in online communities and forums.

3

What is XPath Injection in penetration testing?

Reference answer

XPath Injection is a security vulnerability that occurs when an application constructs insecure XPath queries based on user input. By injecting malicious data into these queries, an attacker can manipulate the XML data retrieval process, potentially gaining unauthorized access to sensitive information or bypassing authentication mechanisms. Proper input validation and parameterized queries can help prevent such attacks.

4

What are some common network protocols?

Reference answer

Common network protocols include TCP/IP, HTTP/HTTPS, FTP, SSH, DNS, DHCP, SMTP, POP3/IMAP, SNMP, and ARP. Each protocol has a specific function, such as transferring files, resolving domain names, or managing email.

5

What are the types of ethical hackers?

Reference answer

Some of the most common types of Ethical hacking professionals include - Grey Box hackers or Cyberwarrior - Black Box penetration Testers (Black Hat hackers) - White Box Penetration Testers (White Hat hackers) - Certified Ethical hacker

6

What tools would you use to inspect network packets?

Reference answer

The most common tools for packet inspection are Wireshark and Dig.

7

What is a Jump Box (or Jump Server)?

Reference answer

A Jump Box (also called Jump Server or Bastion Host) is a secure, hardened computer that acts as a single entry point to access devices in a separate security zone or network segment. It provides a controlled method for administrators and authorized users to connect to critical systems without exposing them directly to less secure networks. Jump boxes typically have enhanced logging, monitoring, and access controls to track all activities and prevent unauthorized access.

8

What is the role of ethics in ethical hacking careers

Reference answer

Ethics guide decisions even when access is possible. Trust is the main reason organizations allow ethical hackers near sensitive systems.

9

What is the Cross site scripting and what it do to users?

Reference answer

Cross site scripting is dangerous when a user's trust in a website is misplaced, which then unknowingly runs malicious code.It often impacts users directly by exposing sessions or manipulating what they see on a page.

10

How would you approach testing a Windows Active Directory environment for vulnerabilities?

Reference answer

My approach to AD testing is to map the domain first, then identify high-value targets and attack paths. I use BloodHound to ingest data from AD and visualize paths to Domain Admin. The graph usually reveals that you can get from any standard user to Domain Admin through a series of trust relationships or group memberships. I test Kerberoasting—request TGS tickets for service accounts and crack those offline. I look for user accounts where the password hasn't changed in years; those are often weaker. I test for credential stuffing with passwords I've found or common patterns. Once I have a foothold, I use Mimikatz to extract credentials from

11

What do you mean by vulnerabilities?

Reference answer

Vulnerabilities refer to weaknesses or flaws in a system, network, or application that can be exploited by attackers to gain unauthorized access, disrupt operations, or compromise data. These vulnerabilities can exist due to improper configurations, outdated software, coding errors, or even human factors such as inadequate security practices. Identifying and addressing vulnerabilities is a crucial aspect of maintaining a secure environment, as they represent potential entry points for cyber threats. Regular assessments and updates are essential to minimize risk and strengthen overall security posture.

12

What are honeypots?

Reference answer

Honeypots are decoy systems designed to attract attackers, allowing security teams to study attack patterns and divert threats from real assets.

13

What are the six phases of ethical hacking?

Reference answer

The six phases are: 1. Reconnaissance:- Gather information about the target system, such as IP addresses, open ports, and software versions. This can be done through passive or active means. 2. Scanning:- Use tools to scan the target system for vulnerabilities and open ports, and perform banner grabbing. 3. Gaining Access:- Attempt to gain access to the target system through various means such as network, OS, or application vulnerabilities. This may also include escalating privileges to gain higher access. 4. Maintaining Access:- Once access is gained, maintain access by injecting backdoors and trojans, using the system as a launchpad, sniffing/monitoring the network, and using resources. 5. Clearing Tracks:- Cover up any traces of the hacking activity by destroying proof and hiding any tools or files used during the hack. 6. Reporting:- Document the findings and recommend remediation steps to improve the security of the target system.

14

How do you stay up-to-date with the latest security vulnerabilities and attack techniques?

Reference answer

I use a mixture of passive and active learning to stay updated. Of course, I'm on social media sites like LinkedIn, Twitter and YouTube. I'm intentional about following people who post IT and cybersecurity-focused content. I also subscribe to newsletters like SANs NewsBites. I've found this method is faster than waiting on traditional news and media outlets. It is also fun as I may be sitting on the couch or relaxing while learning. My favorite resources to follow are: I also like active learning using sites like Hack The Box because this helps me realize the impact and reality of what is mentioned in the news. The Academy modules and Boxes that get released are often inspired by recent vulnerabilities that have been discovered in the industry. Exploit CVE-2023-4911 now - The TwoMillion machine is vulnerable to Looney Tunables, and is available to play on Hack The Box right now. Often I may come across a post on Twitter that links to a GitHub repo with a PoC exploit for a vulnerability found in Active Directory or something, and I'll try that PoC in my own home lab. I did this with NoPac when it was first announced. As soon as I saw it work on my lab domain controller, I immediately started notifying my friends and contacts who lead security teams so they could mitigate.

15

What is the difference between TCP and UDP?

Reference answer

TCP is a connection-oriented protocol and it uses a three-way handshake (SYN, SYN-ACK and ACK). UDP is a connectionless protocol and its speed is much faster than TCP.

16

What is penetration testing reporting?

Reference answer

Reporting documents vulnerabilities, exploitation steps, impact analysis, and remediation recommendations.

17

What makes a system vulnerable?

Reference answer

There are various ways a system can be vulnerable, generally falling into the categories of patch management, vulnerability management, and configuration management. Some common examples are as follows: Running an out-of-date service or application with a known vulnerability that has a public exploit proof-of-concept available. A misconfigured service or application that can be leveraged to gain unauthorized access (i.e., weak or default credentials, lack permissions, no authentication required, etc.) A web application that is vulnerable to web application vulnerabilities such as those covered under the OWASP Top 10. A system that is part of an Active Directory environment that can be accessed via credential reuse or any other myriad of Active Directory attacks. An end-of-life or unstable system that may be “fragile” and subject to a denial of service condition when stressed.

18

What is cryptojacking?

Reference answer

Cryptojacking is when an attacker secretly uses someone else's device to mine cryptocurrency. The victim has no idea their CPU is being drained. It usually gets in through malicious browser scripts or infected software. Detection signs include unusually high CPU usage, slow device performance, and overheating. Security teams look for suspicious outbound connections and abnormal resource consumption to catch it.

19

What tools do you use for continuous vulnerability management, and why?

Reference answer

Look for: Hands-on experience. What to Expect: Mention of tools like Nessus, OpenVAS, Qualys, and reasons for their use, such as accuracy, ease of integration, and comprehensive reporting.

20

What tool would you use to automate SQL injection attacks?

Reference answer

SQLmap is widely used to automate SQL injection attacks and database exploitation.

21

What is CSRF (Cross-Site Request Forgery)?

Reference answer

Cross-Site Request Forgery (CSRF) is a security vulnerability that tricks a user into unknowingly submitting a malicious request to a web application where they are authenticated. This can lead to unauthorized actions, such as changing account settings or making transactions, without the user's consent. CSRF attacks exploit the trust a website has in the user's browser, often by embedding malicious links or requests in websites, emails, or ads that target logged-in users. To prevent CSRF, websites can implement security measures like using anti-CSRF tokens, requiring re-authentication for sensitive actions, and enforcing SameSite cookie attributes.

22

What is a port scan, and how does it work?

Reference answer

A port scan is a technique used to identify open ports on a system, which can help penetration testers identify potential entry points.

23

What is Nmap, and how does it work?

Reference answer

Nmap is a network scanning tool that helps penetration testers identify open ports, services, and operating systems.

24

What is the exploit kit?

Reference answer

The exploit kit is a malicious Toolkit used by cybercriminals to automatically exploit vulnerabilities in Browsers or software. It also installs Malware attacks into the system.

25

What are the concepts of Pharming and web defacement?

Reference answer

Pharming and web defacement are both cyberattack techniques, but they differ in their methods and objectives. Pharming involves redirecting a legitimate website's traffic to a fraudulent site without the user's knowledge. Attackers achieve this by compromising DNS servers or infecting a user's device with malicious software that alters the routing of web traffic. The goal is often to steal sensitive information, such as login credentials or financial data, by making users believe they are visiting a trusted site. Web defacement, on the other hand, refers to the unauthorized alteration of a website's appearance, often replacing its content with offensive, political, or promotional messages. This is typically done by exploiting security vulnerabilities in the website's code or server to gain unauthorized access. The purpose of web defacement is usually to make a public statement or discredit the organization running the site. Both techniques compromise the integrity and trustworthiness of a website, but pharming focuses on data theft, while web defacement is more about altering a website's visual content.

26

What type of tools are there for packet sniffing?

Reference answer

Wireshark is the most common packet sniffing tool. It helps identify odd traffic across the network or programs sending silent traffic from a host.

27

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

Reference answer

A penetration test is a simulated attack performed by security professionals to identify and exploit vulnerabilities, providing in-depth insights into a system's security weaknesses. On the other hand, a vulnerability scan is an automated process that identifies known vulnerabilities and misconfigurations without actively exploiting them. Penetration testing is more comprehensive and manual, while vulnerability scanning is quicker and often used as a preliminary security measure.

28

Can you explain Kerberoasting as if I was 10 years old?

Reference answer

Kerberoasting is a common attack used against Active Directory environments. You will need to possess the ability to explain this attack (and others) to a non-technical audience, such as C-Level executives. By explaining this to a 10-year-old, you can demonstrate your ability to simplify complex topics into an easily digestible format for clients. To learn about Kerberoasting, read How to Perform Kerberoasting Attacks: The Ultimate Guide.

29

What is a buffer overflow?

Reference answer

A buffer overflow is a vulnerability that occurs when a program writes more data to a buffer than it can hold, causing the excess data to overflow into adjacent memory space. This can corrupt data, crash the program, or allow an attacker to execute arbitrary code.

30

What is the ISSAF (Information Systems Security Assessment Framework), and what are its standards?

Reference answer

The ISSAF is a framework for conducting information security assessments, providing standards and best practices for identifying vulnerabilities and risks.

31

How would you try to bypass an intrusion detection system you encounter on a penetration test?

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?

32

How to Sniffer Works in ethical hacking?

Reference answer

In ethical hacking, a sniffer is an application that collects data from the target system. Sniffers are used in order to gain access to systems and networks without being detected by the administrator or users of those systems. A sniffer examines packets that are being sent over a network.

33

What tool would you use to automate SQL injection attacks?

Reference answer

SQLMap is an open source penetration testing tool that automates the process of detecting and exploiting SQL injection attacks.

34

What is DDoS?

Reference answer

A distributed denial-of-service (DDoS) attack is a malicious attempt to disrupt the normal traffic of a targeted server, application or network by overwhelming the target with an amount of traffic that it is unable to handle. This attack targets availability rather than confidentiality or integrity.

35

What is a Trojan Horse, and how does it differ from other types of malware?

Reference answer

A Trojan Horse is a type of malware disguised as legitimate software. Unlike viruses, which self-replicate, or worms, which spread independently, Trojans rely on users to execute them, allowing attackers to gain unauthorized access or control over the system.

36

What is phishing, and how can it be prevented?

Reference answer

Phishing is a type of social engineering attack where an attacker tricks a user into revealing sensitive information through fraudulent emails, texts, or messages. It can be prevented by implementing security awareness programs, using two-factor authentication, and restricting access to sensitive information.

37

What is NTP in Ethical Hacking?

Reference answer

NTP (Network Time Protocol) is a protocol that is used to synchronize the clocks of networked computers. It is often used to ensure that all systems on a network have the same, accurate time. NTP uses UDP port 123 as its primary means of communication and can maintain time to within 10 milliseconds over the public internet. NTP is widely used on a variety of networks, including corporate, academic, and government networks. It is particularly important in environments where accurate time is critical, such as in financial or military applications.

38

What is a denial of service (DoS) attack?

Reference answer

A denial of service (DoS) attack aims to make a system, network, or service unavailable to its intended users by overwhelming it with excessive traffic or triggering a crash. This prevents legitimate users from accessing resources, causing disruption and potentially significant financial and operational damage.

39

What is the difference between an IP address and a Mac address?

Reference answer

With respect to the field of Ethical Hacking, an IP address is a numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication. It serves as the device's virtual address on the internet, allowing it to communicate with other devices and access online resources. Machine Access Control (MAC) is a security measure that controls access to a system or network based on the unique identifier of a device. In Ethical hacking, MAC addresses are often used as a form of authentication to allow or deny access to a network or system based on whether the device's MAC address is on a list of approved or denied addresses.

40

What is WPA, and how does it differ from WEP?

Reference answer

WPA (Wi-Fi Protected Access) is a wireless security protocol that uses a stronger encryption algorithm than WEP. It uses a pre-shared key (PSK) or an enterprise mode with a RADIUS server.

41

Explain the term Google hacking database?

Reference answer

Google Dorking Method or Google Hacking Database is a process by which someone accesses information that they are not authorized to obtain. The term “dork” was originally used within the online world to describe somebody who searched for unimportant and irrelevant information on the internet in order to liven up their search experience, often with humorous results. Dorks have become associated with those who use illegitimate methods such as hacking into databases and searching through private emails without permission.

42

What is URL Redirection Vulnerability?

Reference answer

URL Redirection vulnerability occurs when a web application accepts a user-controlled input that specifies a link to an external site and redirects users to it without proper validation. This can be exploited by attackers to redirect victims to malicious websites, leading to phishing attacks or unauthorized data exposure. Proper validation and restricting redirects to trusted domains can mitigate this risk.

43

What is the difference between Hacking and Ethical Hacking?

Reference answer

Hacking refers to the unauthorized access, modification, or destruction of information or systems. Ethical hacking, also known as 'white hat' hacking, is the practice of legally and ethically accessing and testing computer systems and networks to identify vulnerabilities.

44

What is Honeypot and network sniffing?

Reference answer

Honeypots are decoy systems used as traps to lure cyberattacks. They support security professionals in studying hackers' tricks and tactics. On the other hand, network sniffing is the practice of intercepting and inspecting network traffic. It also contributes to analyzing data packets elegantly over a network.

45

After gaining access to a vulnerable system, what are the privilege escalation vectors you first check for?

Reference answer

Additional situational questions include: - What is social engineering? Describe a situation you would use it to gain initial access during a penetration test. - After gaining access to a vulnerable system, what are the privilege escalation vectors you first check for? - You get simple command injection on a web server through the address bar. What would you do to get a shell?

46

Describe a time when you had to manage a zero-day vulnerability.

Reference answer

Look for: Crisis management skills. What to Expect: A specific example of discovering a zero-day, steps taken to mitigate the risk, and communication with stakeholders.

47

How would you secure the company's server?

Reference answer

To secure the company's server, I'll first need to ensure that all of the company's passwords – for both root and administrative users – are secure. After that, I'd create new users that I'll use to manage the system and take away remote access from root accounts and the default administrator. After completing this step, I'd create firewall boundaries for remote access.

48

What is Penetration Testing?

Reference answer

Penetration testing is a simulated cyberattack performed in an authorized environment to identify, exploit, and demonstrate real-world security weaknesses before malicious attackers can abuse them. Key elements to mention: Authorized & legal engagement Real attack simulation Manual + automated testing Proof of exploitation Business risk validation

49

What is Network Enumeration?

Reference answer

Network Enumeration is the process of identifying hosts/gadgets on a network. This is done by using protocols like ICMP and SNMP to gather information and scanning different ports on remote hosts to identify known services and further understand the function of a remote host.

50

How Do You Handle a Situation Where a Client Disagrees with Your Findings?

Reference answer

This question evaluates conflict resolution skills. Candidates should describe how they would provide evidence to support their findings, remain professional, and work collaboratively with the client to address concerns.

51

What methodologies do you follow when conducting a Penetration test?

Reference answer

Penetration testing methodology follows industry-standard frameworks like the Open Source Security Testing Methodology Manual (OSSTMM), Penetration Testing Execution Standard (PTES), and National Institute of Standards and Technology Special Publication 800-115 (NIST SP 800-115). It begins with defining the scope and rules of engagement, followed by passive and active reconnaissance. Vulnerabilities are then identified and assessed using tools such as Nmap, Nessus, or Burp Suite. Exploitation is performed using Metasploit or custom scripts, with privilege escalation and lateral movement as needed. The final phase includes reporting all findings, risks, and remediation recommendations.

52

You get simple command injection on a web server through the address bar. What would you do to get a shell?

Reference answer

Additional situational questions include: - What is social engineering? Describe a situation you would use it to gain initial access during a penetration test. - After gaining access to a vulnerable system, what are the privilege escalation vectors you first check for? - You get simple command injection on a web server through the address bar. What would you do to get a shell?

53

Tell me about a time you found a vulnerability that surprised you.

Reference answer

I tested a healthcare company, and while reviewing their network, I noticed they had a legacy Windows 7 machine on the network that wasn't supposed to be there anymore. Someone had just left it running 'temporarily' six months ago. It had no patches, no antivirus, and I compromised it in minutes. What surprised me wasn't the technical vulnerability—it was how easily organizational issues create security gaps. No one had documented it, so it fell through the cracks. From that point on, I learned to focus my reconnaissance not just on finding exploitable technical flaws, but on finding places where processes and technology don't align. I also discovered that after I reported it, the real problem wasn't fixing the machine; it was the client's struggle with asset management. That experience changed how I think about security testing. Now I look for patterns that indicate systemic issues, not just point vulnerabilities.

54

How would you bypass a firewall or IDS during a Penetration test?

Reference answer

To bypass firewalls or Intrusion Detection Systems (IDS), it's important to first understand how they work. Techniques like fragmentation or obfuscation can help avoid signature-based detection while encrypting or encoding payloads can evade IDS. Tunnelling methods, such as HTTP or DNS tunnels, can disguise malicious traffic as legitimate. Slow and low-volume attacks, like Slowloris, are also effective in evading detection by staying under bandwidth thresholds.

55

What is DNS Spoofing, and how can it be prevented?

Reference answer

DNS Spoofing, or DNS cache poisoning, is a technique where attackers manipulate DNS records, redirecting users to malicious sites. Prevention methods include DNSSEC (Domain Name System Security Extensions) and using encrypted DNS requests.

56

What is DNS?

Reference answer

The Domain Name System (DNS) is a service used to translate domain names to the numerical IP addresses needed for locating and identifying computer services, for example 142.250.69.196 is translated to www.google.com. It runs on port 53.

57

Why is penetration testing necessary?

Reference answer

Penetration testing is necessary to identify vulnerabilities in systems, networks, and applications before malicious attackers can exploit them. It helps organizations strengthen their security posture, comply with regulatory requirements, and protect sensitive data from breaches.

58

Explain the difference between symmetric and asymmetric encryption.

Reference answer

Symmetric encryption uses the same key for both encryption and decryption, making it faster but less secure for key exchange. Asymmetric encryption, on the other hand, uses a pair of keys—one for encryption and another for decryption—providing better security for key exchange.

59

Can you describe the differences between risk analysis and penetration testing?

Reference answer

Both risk analysis and penetration testing are important aspects of cybersecurity and can complement each other well. A risk analysis is the process of studying all potential threats and faults that could lead to vulnerabilities in software. It doesn't require any scanning tools or applications, instead, a risk analysis aims to identify assets, vulnerabilities, threats, and the overall impact on the company if the vulnerability were exploited. On the other hand, a penetration test is the act of lawfully attacking a system to identify any vulnerabilities. This tests whether existing systems and processes are actually working. Overall, a risk analysis is more practical, identifying potential risks and impacts. Whereas, a penetration test is more technical, going beneath the surface to uncover vulnerabilities.

60

What tool would you use to perform an ARP spoofing attack?

Reference answer

The main tools used for ARP spoofing are Arpspoof, Ettercap and Responder.

61

What is the difference between encoding, encryption, and hashing?

Reference answer

Encoding is transforming data into a different format for safe transmission; encryption secures data so only authorized users can decode it, while hashing produces a fixed-length value, or “hash,” that represents the data. Hashing is one-way, while encoding and encryption are reversible with the correct key or method.

62

What are some common tools used by ethical hackers? (e.g., Nmap, Metasploit, Wireshark)

Reference answer

Common ethical hacking tools include: - Nmap: for network discovery and port scanning. - Metasploit: for developing and executing exploit code against a remote target. - Wireshark: for network protocol analysis and packet capturing. - Burp Suite: for web application security testing. - John the Ripper/Hashcat: for password cracking. - Nessus/OpenVAS: for vulnerability scanning.

63

Write a Python function to detect if a given string is a valid IPv4 address.

Reference answer

Look for: Understanding of string manipulation and regex. import re def is_valid_ipv4(ip): pattern = re.compile(r"^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$") if pattern.match(ip): return all(0 <= int(num) <= 255 for num in ip.split('.')) return False # Example usage print(is_valid_ipv4("192.168.1.1")) # True print(is_valid_ipv4("256.256.256.256")) # False

64

What is Insecure Design Vulnerability?

Reference answer

Insecure Design Vulnerability refers to flaws in the initial design of an application or system that fail to consider necessary security measures. These vulnerabilities arise when security is not a priority during the planning and architecture phases, leaving the system susceptible to exploitation. Poor design choices can lead to weaknesses that attackers can exploit, such as inadequate validation, improper access controls, or lack of secure data handling practices.

65

Can you discuss a recent cyber-attack and its mitigation?

Reference answer

An instance of this is the Log4j vulnerability, which was leveraged for executing remote code. Organizations mitigated it by patching systems, using Web Application Firewalls (WAFs), and enhancing monitoring.

66

What is the difference between active and passive reconnaissance?

Reference answer

Active reconnaissance directly interacts with the target, while passive reconnaissance gathers information without direct contact.

67

At what point of an assessment would you start performing testing?

Reference answer

Only once a clear scope of work and timeline has been defined and agreed to by all parties, and once authorization to start the testing has been received.

68

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

Reference answer

Tools like Nessus or OpenVAS can be used to scan networks for known vulnerabilities.

69

What is a DoS/DDoS attack?

Reference answer

DoS (Denial of Service) and DDoS (Distributed Denial of Service) attacks involve overwhelming a server or network with excessive traffic, causing it to become unavailable to legitimate users.

70

What is whaling, and how does it differ from phishing?

Reference answer

Whaling is a type of phishing attack that targets high-level executives or officials. It's more sophisticated and convincing than traditional phishing attacks.

71

What are the Phases of a Network Penetration Test?

Reference answer

- Reconnaissance: Collecting target data. - Scanning: Identifying vulnerabilities. - Gaining Access: Exploiting vulnerabilities. - Maintaining Access: Extracting data stealthily. - Covering Tracks: Hiding evidence.

72

What are NetBIOS DoS attacks?

Reference answer

A NetBIOS attack is a method of engaging an attack from infected computers by sending packets of information that interfere with the victim. This can cause serious damage to businesses because they rely on their networks for communications, file sharing, and other essential functions. To attack a NetBIOS system by sending a large number of NetBIOS query requests, an attacker can use the targets of a NetBIOS DoS Attack are usually computers on a network that are used by the company or organization that is being attacked. The attacker's goal is to prevent these computers from working, and he or she does this by sending bogus name service requests to the computers.

73

What are your strengths and weaknesses as a cybersecurity professional?

Reference answer

My strengths include strong analytical skills, a deep understanding of network protocols, and persistence in solving complex problems. My weakness is that I can sometimes focus too much on technical details, potentially missing the broader picture. I actively work on this by seeking feedback and practicing strategic thinking.

74

What Is Web Application Scanning with w3af in Penetration Testing?

Reference answer

Web application scanning with w3af involves detecting vulnerabilities in web applications. It identifies security flaws like SQL injection, XSS, and insecure configurations. w3af automates vulnerability detection, helping penetration testers assess risks, strengthen security, and patch weaknesses before full-scale attacks occur.

75

How does privilege escalation work in system hacking?

Reference answer

Privilege escalation in system hacking allows an attacker to gain higher levels of access than they were originally granted. There are two types: - Vertical Privilege Escalation: The attacker moves from a lower privilege level (e.g., regular user) to a higher one (e.g., administrator or root). This is typically done by exploiting software vulnerabilities, weak configurations, or system flaws. - Horizontal Privilege Escalation: The attacker gains access to another user's resources or data at the same privilege level, usually through methods like session hijacking or exploiting weak passwords. Techniques used include exploiting unpatched vulnerabilities, default credentials, misconfigurations, or insecure applications to elevate access, giving the attacker full control over the system.

76

What is IDOR, what are its consequences and how can you prevent it?

Reference answer

Insecure direct object references (IDOR) are a type of access control vulnerability that arises when an application uses user-supplied input to access objects directly. If present, they can allow attackers to access unintended data on the database, including sensitive information such as passwords, potentially gaining full access to the web server. It can be prevented through input validation or by using indirect references.

77

List out some tools for network scanning and analysis?

Reference answer

Here are some common tools for network scanning and analysis: - Nmap: Nmap is one of the most popular tools for exploring the network and available security control. It has long been used for penetration testing, forensic analysis, security research, and privileged user identification (PUD). - Burpsuite: The burp suite tool is a command-line interface (CLI) to manage and monitor the security of systems. It automates many common tasks that are needed for penetration testing, such as gathering system information, performing reconnaissance scans, establishing vulnerabilities, installing exploits, and bypassing protection measures. The burp suite tool has been designed with the ethical hacker in mind and can help them achieve their goals while abiding by ethical hacking principles. - Wireshark: Wireshark is a network protocol analyzer and is mainly used for network troubleshooting but it can be used for ethical hacking as well. - Cain and Able: Cain and Able tools are ethical hacking tools that can be used by penetration testers to test the security of a computer system. Caine is a powerful automated vulnerability scanner that uses scanning techniques to find vulnerabilities in systems. The software also includes an exploit pack for finding zero-day exploits on vulnerable systems. Able is an auditing tool that helps administrators track changes made to files, Registry keys, Services, and startup items on computers. - NCAP: The NCAP tool is used for ethical hacking. The NCAP tool helps in identifying the different vulnerabilities on a computer system and can be used to exploit these vulnerabilities for data theft, online fraud or even attacking other systems. Ethical hackers use this software primarily to find out the weaknesses of networks, servers, and individual computers so that they can be fixed by security experts before attackers gain access to them.

78

What are Pharming and Defacement?

Reference answer

- Pharming: In this method, the hacker compromises the DNS servers or on the user's PC with the goal that traffic is headed toward a malicious site. - Defacement: In this strategy, the attacker replaces the firm's site with an alternate page. It contains the hacker's name, and images and may even incorporate messages also.

79

Discuss vulnerability in the Windows operating system?

Reference answer

A common vulnerability in Windows is the use of vulnerabilities in the operating system. These vulnerabilities are used to exploit the security of the computer. Once the attacker has exploited a vulnerability in the operating system, they can gain access to the computer. This type of attack is used to steal data or to install malware on the computer.

80

How do you ensure the confidentiality of the data you handle during a penetration test?

Reference answer

Candidates should describe measures such as non-disclosure agreements (NDAs), encrypted storage and transmission of data, and access controls to limit who can see the information. They might also discuss secure environments for analysis and regular audits of their processes. Look for responses that demonstrate a strong understanding of privacy laws and best practices.

81

Tell me about a time you failed in a penetration test or missed something important.

Reference answer

Early in my career, I tested a company's network and found only minor issues. I thought the test went well. Three months later, they experienced a breach through their domain controller, which had a patch available for six months but hadn't been applied. I'd actually discovered the missing patches during my scan, but I'd prioritized it as 'medium severity' instead of 'critical' because the client had accepted the risk. What I should have done was communicate more clearly about the danger. I should have said, 'Yes, you can accept this risk, but here's what it means: an attacker can compromise your entire network in under an hour.' If I'd been clearer about the true business impact, they might have changed their decision. Now, I make sure my risk communication is brutally clear, and I always follow up with high-risk accepted items to make sure the client still understands what they're accepting.

82

Write a simple Python script to scan a range of IP addresses for open ports.

Reference answer

To scan a range of IP addresses for open ports, you can use the socket library in Python. Here's a simple script that iterates through a range of IP addresses and checks for open ports on each.

83

What is a vulnerability scanner, and how does it work?

Reference answer

A vulnerability scanner is a tool that identifies potential vulnerabilities in a system or network, often using a database of known vulnerabilities.

84

What is "incident response"?

Reference answer

Incident response is the process of handling security incidents, such as breaches, attacks, or system failures. It involves detecting the incident, containing the damage, investigating the cause, and implementing corrective actions to prevent future incidents.

85

What is Privilege Escalation?

Reference answer

This type of attack involves exploiting a vulnerability in a system to gain higher-level privileges than are normally allowed for a user.

86

What is Cowpatty?

Reference answer

Cowpatty is implemented on an offline dictionary attack against WPA/WPA2 networks utilizing PSK-based verification (e.g. WPA-Personal). Cowpatty can execute an enhanced attack if a recomputed PMK document is accessible for the SSID that is being assessed.

87

What skills are required to become a penetration tester?

Reference answer

Skills include networking, Linux, scripting, web technologies, security concepts, and analytical thinking.

88

What are rogue access points?

Reference answer

Rogue access points are devices that have been deliberately added to a network without the knowledge or consent of the authorized person. These unauthorized devices can be used by attackers to gain an advantage over other networks and systems connected to them. Rogue access points can also provide an attacker with a way into networks protected by firewalls and intrusion detection/prevention systems (IDS/IPS).

89

What is an intrusion detection system (IDS)?

Reference answer

An intrusion detection system (IDS) is a security application or device that monitors a network to detect malicious activities or policy violations. Detected malicious activities or violations are reported or collected centrally with the help of a security information and event management system. IDS that can respond to intrusions upon discovery are classified as intrusion prevention systems (IPS).

90

What is the difference between passive and active reconnaissance?

Reference answer

Gathering information about targeted computers and networks without directly interacting with the systems is known as passive reconnaissance. Conversely, in active reconnaissance, the attacker interacts with the target system, usually by conducting a port scan to identify any open ports.

91

How would you protect against session hijacking?

Reference answer

Session hijacking occurs when an attacker takes over a valid user session. To prevent this, follow these steps: - Use HTTPS – Encrypt communication to prevent interception. - Secure Cookies – Set Secure, HttpOnly, and SameSite attributes. - Regenerate Session IDs – Create new IDs on login and privilege changes. - Set Expiry & Timeouts – Auto-log out inactive users. - Monitor Anomalies – Track IP/device changes for suspicious activity. - Enable MFA – Add an extra authentication layer. - Restrict IP/Device Access – Bind sessions to specific IPs/devices. - Use Token-Based Auth – Implement JWT/OAuth with short expirations. These measures can help prevent unauthorized access.

92

What is SQL injection?

Reference answer

SQL injection is a web application vulnerability that allows attackers to manipulate database queries through unsanitized user input.

93

What is a "zero-trust security model"?

Reference answer

A zero-trust security model assumes that no user or device can be trusted by default, regardless of its location or network access. It requires explicit verification and authorization for every access request, preventing unauthorized access and mitigating the impact of breaches.

94

Can you share an experience where you successfully used social engineering in a penetration test?

Reference answer

Look for: Ethical considerations. What to Expect: A detailed example of a social engineering attack, the approach taken, and the outcome.

95

How does a network sniffer function in ethical hacking?

Reference answer

In ethical hacking, a network sniffer functions by capturing and analyzing data packets traveling across a network. It operates by placing the network interface card (NIC) into promiscuous mode, allowing it to intercept all network traffic, not just packets addressed to that device. The sniffer then decodes the captured packets, providing detailed information about their contents. This includes source and destination addresses, protocols used, and payload data. Ethical hackers use this tool to identify network vulnerabilities, troubleshoot connectivity issues, monitor network performance, and detect potential security threats. By examining the captured traffic, they can uncover unencrypted sensitive information, detect unusual network behavior, and identify potential attack vectors. It can help them strengthen the network's security posture.

96

Do You Have Experience in Risk Analysis?

Reference answer

Yes, risk analysis involves identifying potential security threats, evaluating their impact, and applying mitigation strategies. It helps organizations prioritize vulnerabilities, strengthen their security framework, and allocate resources effectively. It also supports proactive threat management by reducing exposure to security risks.

97

What is a DNS reconnaissance tool, and how does it work?

Reference answer

A DNS reconnaissance tool is software that gathers information about a target's DNS infrastructure, such as domain names, IP addresses, and DNS servers.

98

What is a man-in-the-middle attack?

Reference answer

A man-in-the-middle attack occurs when an attacker intercepts communication between two parties to eavesdrop or modify the data.

99

What is cross-site scripting (XSS) and what are its different types?

Reference answer

Cross-site scripting (XSS) is a web security vulnerability. It allows attackers to inject malicious scripts into websites. These scripts then execute in a user's browser, potentially stealing data, hijacking sessions, or defacing web pages. Types of XSS Attacks: - Stored XSS – Malicious script is permanently stored on the server (e.g., in a database) and served to users when they visit affected pages. - Reflected XSS – Script is embedded in a URL or request and executed when a victim clicks on a malicious link. - DOM-Based XSS – The vulnerability exists in client-side JavaScript, where the browser dynamically modifies the DOM, allowing script execution. Proper input validation, output encoding, and Content Security Policy (CSP) help mitigate XSS risks.

100

What is a zero-day vulnerability?

Reference answer

A zero-day vulnerability is a software flaw unknown to the vendor, leaving no patch available at the time of discovery.

101

What is privilege escalation?

Reference answer

Privilege escalation is the act of exploiting a bug or vulnerability to gain elevated access to resources that are normally protected.

102

How do you monitor and detect Kerberoasting?

Reference answer

Windows event ID 4769 is logged on Domain controllers whenever a service ticket is requested. An unsophisticated attacker will request tickets for all service accounts at once, which is an unusual, detectable pattern that the Security Information and Event Management (SIEM) can be configured to alert on. Honeypot service accounts accomplish this goal of detecting a Kerberoast attack across all service accounts as well. For more OPSEC conscious attacks, that target individual service accounts, more correlations will have to be drawn to deduce suspicious activity such as requests for RC4 encryption, monitoring process creation logs and command line arguments for Rubeus or Impacket tools with Endpoint Detection and Response (EDR).

103

What are the steps involved in performing enumeration?

Reference answer

Enumeration is the process of identifying all devices connected to a network, system, Organization, or individual. In ethical hacking, enumeration is used to probe the security of an organization's systems by identifying any potential vulnerabilities that may be exploited during attacks. The vulnerability assessment process begins with making a determination about what constitutes the system under assessment. It is the goal of Security Operations Center/Security Operations Programs (SOC/SOP) programs to analyze and effectively deal with security vulnerabilities. Eventually, those action plans may even result in companies.

104

What is footprinting?

Reference answer

Footprinting is the process of gathering information about a target organization or system to identify potential security weaknesses. This reconnaissance phase involves collecting data such as domain names, IP addresses, network infrastructure, and employee details. The goal is to build a complete profile of the target to plan further actions, whether for ethical hacking or malicious intent.

105

What is SQL Injection?

Reference answer

SQL injection is when an attacker inserts malicious SQL code into an input field, like a login form, to manipulate the database behind it. For example, entering ' OR '1'='1 can bypass login authentication entirely. The fix? Use parameterized queries (also called prepared statements), which treat user input as data, not code.

106

What are the strengths and differences between Windows and Linux for web application testing?

Reference answer

Windows and Linux both have strengths and weaknesses when it comes to web application testing. For beginners, Windows can be more user-friendly than Linux, which is more challenging to use. However, Linux is much more reliable and secure in comparison to Windows. This is because inexperienced users often use Windows, making the OS more vulnerable to attackers. In terms of usability for web application testing, Linux has a wider variety of native penetration testing tools, as well as a high degree of customization. The command-line interface in Linux is ideal for scripting and automation. Having said this, Windows can be easier to navigate and offers many commercial tools. It's also important to consider that many organizations use Windows, meaning that pentesting from a Windows machine will much better mimic those real-world scenarios. I personally advocate for a hybrid approach, upskilling my web application testing using both machines, enabling me to benefit from both.

107

What is "IoT security"?

Reference answer

IoT security focuses on protecting Internet of Things (IoT) devices from cyberattacks and unauthorized access. It addresses the unique challenges of securing a vast network of interconnected devices, often with limited processing power and security features.

108

Why is continuous learning necessary in ethical hacking

Reference answer

Attack techniques evolve constantly. Staying updated matters more than relying on what worked in the past.

109

Give examples of some automated penetration testing tools?

Reference answer

Here are some automated penetration testing tools: - Nessus - Metasploit - Astra vulnerability scanner - Openvas - BurpSuite - Nikto - Nmap - SQLmap

110

What tools are used for network sniffing beyond Wireshark?

Reference answer

Wireshark is the most popular, but there are others worth knowing: Tcpdump: Command-line packet analyzer, great for remote servers Dsniff: A collection of tools designed specifically for sniffing passwords and sensitive data over a network Ettercap: Used for MitM attacks and live sniffing on switched networks NetworkMiner: Focused on passive capture and host analysis

111

What is "encryption"?

Reference answer

Encryption is the process of converting data into an unreadable format using an algorithm and a secret key. Only individuals with the correct key can decrypt the data back to its original form, protecting it from unauthorized access and disclosure.

112

What are the different stages of hacking in Ethical Hacking?

Reference answer

Stages of Ethical hacking include: - Gaining access: This is the first stage of a hacking attack, where the attacker tries to gain access to the target system or network. This might involve exploiting a vulnerability, guessing a password, or using social engineering techniques to trick the user into giving away their login credentials. - Escalating privileges: Once the attacker has gained access to the system, they may try to escalate their privileges so that they have more control over the system. This might involve exploiting a privilege escalation vulnerability, or using stolen credentials to log in as a higher-privileged user. - Executing applications: After gaining sufficient privileges, the attacker may try to execute malicious code or applications on the system in order to achieve their goals (e.g., stealing data, and installing malware). - Hiding files: In order to maintain their access and avoid detection, the attacker may try to hide files or evidence of their presence on the system. This might involve creating hidden directories or modifying file attributes to make them appear as normal system files. - Covering tracks: After completing their attack, the attacker may try to cover their tracks by deleting log files, modifying system timestamps, or disguising their actions as normal system activity. This makes it harder for defenders to identify and track the attack.

113

What are the primary methods used in reconnaissance during an ethical hacking engagement?

Reference answer

Look for: Understanding of both passive and active reconnaissance techniques. What to Expect: The candidate should mention methods like open-source intelligence (OSINT), network enumeration, and footprinting, and be familiar with tools like Nmap, Maltego, and Google Dorks.

114

How do you keep up-to-date with the latest developments in penetration testing and cybersecurity?

Reference answer

I stay updated by engaging in continuous learning through training and certifications, reading security blogs, participating in cybersecurity communities, and practicing skills on platforms that simulate real-world scenarios.

115

What is the principle of least privilege?

Reference answer

The principle of least privilege (PoLP), requires that in a given system, application or network, a user must be able to access only the information and resources that are necessary for its legitimate purpose.

116

What is DNS Spoofing?

Reference answer

DNS Spoofing involves altering DNS records to redirect users to malicious sites, often for stealing sensitive information.

117

What's your experience with web application penetration testing?

Reference answer

Web applications are where I spend a lot of my testing time. I'm comfortable with the OWASP Top 10, and I've found real examples of most of them in client environments. My approach typically starts with Burp Suite—I set up the proxy, explore the application normally to understand the functionality, and then start probing input fields systematically. I test for injection vulnerabilities (SQL, command, template), XSS, CSRF, broken authentication, and insecure deserialization. I also look at API endpoints carefully because they're often less protected than the web interface. I recently found a critical vulnerability in a fintech app where the API was returning sensitive user data in error messages—it wasn't even an intentional backdoor, just careless error handling. I've also tested for business logic vulnerabilities, not just technical flaws. For example, I found a discount code system that allowed unlimited application of the same coupon. That's not a technical vulnerability, but it could bankrupt the client. I think good web app testing requires understanding both the technical layer and the business logic.

118

How do you handle stress and pressure in a high-pressure situation?

Reference answer

I handle stress by prioritizing tasks based on urgency and impact, breaking down complex problems into manageable steps. I maintain open communication with my team to share the workload and stay focused. I also take short breaks to clear my mind and rely on my training and experience to remain calm and methodical under pressure.

119

What are some of the most common vulnerabilities?

Reference answer

Some of the most common vulnerabilities are injection, deserialization, file inclusion, weak encryption, security misconfigurations, weak password policies.

120

What are common cloud security issues?

Reference answer

Cloud computing has revolutionized the way businesses operate, but it also introduces a myriad of security challenges. - Data breaches: Sensitive information stored in the cloud can be exposed due to weak security measures or misconfigurations. - Lack of proper access controls: Lack of proper access controls may allow unauthorized users to gain entry to critical systems or data. - Misconfigured cloud settings: Misconfigured cloud settings, such as exposed storage buckets, remain a frequent vulnerability that attackers exploit. - Shared environments and multi-tenancy: Shared environments and multi-tenancy can give rise to potential risks such as data leakage or cross-tenant attacks. - Insecure APIs and interfaces: Organizations also face threats from insecure APIs and interfaces, which can become points of entry for attackers if not adequately secured. - Compliance and regulatory concerns: Compliance and regulatory concerns arise when cloud providers fail to meet necessary international and industry-specific standards, leaving businesses vulnerable to legal and financial repercussions. Addressing these issues requires a combination of robust policies, regular audits, encryption, and vigilant monitoring.

121

How do you conduct an external penetration test?

Reference answer

An external penetration test involves simulating an attack from outside the network. The process typically includes reconnaissance, scanning and enumeration, gaining access, maintaining access, and covering tracks. The goal is to identify vulnerabilities that an external attacker could exploit.

122

What are the different types of security testing?

Reference answer

Security testing encompasses various methodologies to assess the security posture of systems and applications. Some common types include: - Penetration testing: Simulates real-world attacks to identify vulnerabilities and assess the system's resilience. - Vulnerability scanning: Automatically checks systems for known vulnerabilities using a database of security flaws. - Code review: Manual or automated inspection of code to identify security flaws and coding errors. - Security audit: Comprehensive assessment of an organization's security controls and practices. - Red teaming: A simulated adversarial attack exercise to test the effectiveness of an organization's security defenses. - Security awareness training: Educating users about security best practices and threats.

123

What are some intrusion detection systems and evasion techniques in hacking?

Reference answer

Intrusion Detection Systems (IDS) are used to detect unauthorized access to networks or systems. Common types include: - Signature-based IDS: Detects known attack patterns (e.g., Snort, Suricata). - Anomaly-based IDS: Identifies unusual traffic patterns (e.g., OSSEC, Bro/Zeek). - Hybrid IDS: Combines both methods (e.g., Prelude IDS). Evasion Techniques are methods used by attackers to bypass IDS detection. Common types include: - Packet Fragmentation: Breaks packets to bypass signature detection. - Encoding: Hides payloads with encoding (e.g., Base64). - Traffic Padding: Adds random data to mask malicious traffic. - Spoofing: Alters packet headers to disguise attack origin. - Tunneling: Hides attacks within legitimate protocols (e.g., HTTP). - Polymorphism: Changes attack payloads to avoid signature detection. - Timing Attacks: Slows down attacks to evade anomaly-based IDS. These evasion techniques help attackers bypass detection and maintain a stealthy presence.

124

What role does networking knowledge play in ethical hacking

Reference answer

Most attacks move through networks at some point. Without understanding traffic flow attackers behavior and protocols testing stays incomplete.

125

Difference Between Nmap and Masscan

Reference answer

Nmap: Slower but detailed, service detection, script engine, OS detection. Masscan: Extremely fast, port discovery only, no NSE, OS detection not supported. Masscan is used for large-scale internet scanning. Nmap is used for deep enumeration.

126

How would you protect against session hijacking?

Reference answer

To protect against session hijacking, use HTTPS to encrypt all communication and prevent interception. Secure session management by setting short expiration times and regenerating session IDs after login or privilege changes. Enable HttpOnly and Secure flags on cookies to prevent client-side access. Implement multi-factor authentication (MFA) for an extra layer of security. Monitor session activity to detect abnormal behavior and trigger re-authentication if needed. Periodically rotate session tokens to reduce the risk of stolen tokens being used. Finally, set reasonable session timeouts to minimize the window for hijacking. These steps help ensure secure session handling.

127

What is DHCP Rogue Server in Ethical Hacking?

Reference answer

A rogue DHCP server is a network device that is configured to act as a DHCP (Dynamic Host Configuration Protocol) server but is not authorized or controlled by the network administrator. This can pose a significant security risk, as the rogue server can offer IP addresses, default gateways, and WINS servers to users as soon as they log in, potentially intercepting all traffic sent by the client to other networks. To prevent rogue DHCP servers from creating security vulnerabilities on a network, it is important for organizations to implement strong security measures and to monitor network activity for any unauthorized DHCP servers. This may involve implementing network access control policies, regularly updating and patching network devices, and using tools like firewall protection and intrusion detection systems to detect and respond to threats. By taking these and other precautions, organizations can help to protect their networks and keep sensitive data secure.

128

Write a Python script to encrypt a string using a simple Caesar cipher with a shift of 3.

Reference answer

Look for: Understanding of basic encryption techniques. def caesar_cipher(text, shift): encrypted = [] for char in text: if char.isalpha(): shift_base = 65 if char.isupper() else 97 encrypted.append(chr((ord(char) - shift_base + shift) % 26 + shift_base)) else: encrypted.append(char) return ''.join(encrypted) # Example usage print(caesar_cipher("Hello, World!", 3)) # Khoor, Zruog!

129

How would you advise other employees in the organization to avoid identity theft?

Reference answer

I would offer them the following tips: - Make sure you use a strong password including letters, numbers, and special characters - Only shop via popular and trusted websites - Don't share any passwords with anyone - Install advanced spyware and malware protection tools on your computers - Keep your system and software up-to-date - Don't share confidential information online or on social media - Make sure your browser is up-to-date

130

How would you test an API for security vulnerabilities?

Reference answer

API testing is different from web app testing, and I approach it methodically. First, I document the API—what endpoints exist, what they're supposed to do, what authentication they require. I check if there's API documentation available, but I also explore the actual behavior because documentation is often incomplete or inaccurate. I test for broken object level authorization—can I access resources that belong to other users just by changing an ID? I test for injection attacks in API parameters. I look at authentication mechanisms—are tokens validated properly? Can I reuse old tokens? I test rate limiting—can I brute force API keys? I also check for information disclosure through error messages and verbose responses. I recently tested an API that returned detailed error messages including database queries when something went wrong. An attacker could use that information to craft SQL injection attacks. I use tools like Postman or curl for detailed testing, and I write custom scripts to automate API calls and look for patterns. The key is treating the API as a user interface in itself, not as something that's automatically secure because it's not a web browser.

131

Elaborate Ethical Hacking.

Reference answer

Ethical hacking is the practice of probing computer structures to explore vulnerabilities, weaknesses, and potential threats. It also improves cybersecurity defenses and shields against malicious attacks.

132

How can penetration testing support risk management and governance?

Reference answer

Penetration testing can help organizations identify and prioritize risks, and develop strategies to manage and mitigate them.

133

What is the difference between a data leak and a data breach?

Reference answer

A data leak is when unauthorized information is released either through an unauthorized person or because the information was accessed by a hacker. A data breach is part of a cyberattack and involves a cybercriminal attacking a system, server, or email.

134

What Is SSL Stripping in Penetration Testing?

Reference answer

SSL stripping is an attack that downgrades HTTPS connections to HTTP, removing encryption. It allows attackers to intercept, view, and modify sensitive data transmitted in plaintext. This method is used for man-in-the-middle (MITM) attacks to steal login credentials and personal information.

135

What is Ethical Hacking?

Reference answer

Ethical Hacking is the practice of bypassing system security legally and with the permission of the owner to identify potential threats and vulnerabilities in a network.

136

Where would you got to find out if a software you encounter has any security vulnerabilities you can exploit?

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?

137

What is a golden ticket attack?

Reference answer

A golden ticket attack exploits Kerberos by forging a Ticket-Granting Ticket (TGT) using domain admin credentials, granting persistent, unauthorized access to network resources.

138

What do you mean by cybersecurity?

Reference answer

Cybersecurity refers to the practice of protecting systems, networks, and data from digital attacks, unauthorized access, or damage. It involves implementing technologies, processes, and practices designed to safeguard sensitive information and maintain the integrity, confidentiality, and availability of data. Cybersecurity encompasses various domains, including application security, network security, endpoint protection, and identity management. By addressing threats such as malware, phishing, ransomware, and other forms of cyberattacks, cybersecurity ensures the safety of individuals, organizations, and governments in the increasingly connected digital landscape.

139

What is Active Directory?

Reference answer

Active Directory is a centralized identity & access management system used in Windows domains. It manages users, groups, computers, policies, and authentication. Compromising AD often means compromising the entire organization.

140

What are some entry-level cybersecurity certifications?

Reference answer

Entry-Level: CompTIA Security+ (vendor-neutral basics), CEH (Certified Ethical Hacker) for penetration testing fundamentals.

141

What is a Payload in the context of malware?

Reference answer

A payload is the portion of malware or exploit that carries out the malicious action. It is typically a piece of code or data that is delivered through the exploit and executed on the target system. The payload can take many forms, such as a script, software program, or command, and it can be used to perform a variety of malicious actions, such as stealing sensitive information, installing backdoors, or disrupting system operations.

142

How do you ensure that your penetration testing activities do not disrupt normal business operations?

Reference answer

To ensure that penetration testing activities do not disrupt normal business operations, careful planning and communication are key. Testing is typically scheduled during non-peak hours, and all stakeholders are notified in advance. Additionally, detailed scoping is conducted to define boundaries and avoid critical systems. Backup plans and monitoring are also implemented to quickly address any unexpected issues.

143

What is a reverse shell?

Reference answer

A reverse shell allows a compromised system to initiate a connection back to the attacker, bypassing firewall restrictions.

144

What is a "digital certificate"?

Reference answer

A digital certificate is an electronic document that binds a public key to an entity, such as a user or a website. It is issued by a trusted certificate authority (CA) and serves as a digital identity that verifies the authenticity and ownership of the certificate holder.

145

What Is Data Packet Sniffing?

Reference answer

Data packet sniffing is a technique used to monitor and capture network traffic. It helps identify suspicious activity, unauthorized access, and data leaks. Tools like Wireshark and Tcpdump are commonly used for packet sniffing to analyze network behavior and detect security threats.

146

How can penetration testing support DevOps and DevSecOps?

Reference answer

Penetration testing can be integrated into DevOps and DevSecOps practices to identify vulnerabilities early in the development cycle and improve the security of software releases.

147

What Is Reflected XSS Vulnerability?

Reference answer

Reflected XSS (Cross-Site Scripting) occurs when malicious scripts are injected into web pages through user inputs. The script is reflected in the browser, allowing attackers to steal cookies, session tokens, or manipulate web content. Proper input validation and sanitization prevent XSS attacks.

148

What is Pharming and Defacement?

Reference answer

- Pharming: In this technique, the attacker compromises the DNS, i.e., Domain Name System servers or on the user's computer, such that traffic is routed toward the malicious site. - Defacement: The act of replacing a company's website with something else. It normally features the hacker's name and images while, in some cases, carrying messages and accompanied by background music.

149

What is SSL and how is it used?

Reference answer

SSL stands for Secure Sockets Layer. It's a type of technology used to protect the information in online payments and transactions by creating and using encrypted connections between a web browser and a web server. SSL certificates are used to provide data privacy.

150

What tool would you use to bruteforce passwords, online and offline?

Reference answer

Hydra and Patator are used for online cracking, where as John the Ripper and Hashcat are used for offline cracking.

151

Describe the permission system used in Linux file systems

Reference answer

Linux file permissions use three categories: owner, group, and others, each with read (r), write (w), and execute (x) permissions, represented as numeric values (e.g., 755).

152

Explain the concept of a zero-day vulnerability.

Reference answer

An amazing answer would clearly define a zero-day vulnerability as a security flaw that is unknown to the software vendor. It is called 'zero-day' because developers have zero days to fix it before it can be exploited.

153

What is the difference between Asymmetric and Symmetric encryption?

Reference answer

Asymmetric encryption: Asymmetric encryption uses different keys for encryption and decryption. Asymmetric on the other hand is more secure but slow. Hence, a hybrid approach should be preferred. Symmetric encryption: Symmetric encryption uses the same key for both encryption and decryption. Symmetric is usually much faster but the key needs to be transferred over an unencrypted channel.

154

What tool would you use to inspect the route between a host and a destination?

Reference answer

Traceroute (Linux) or tracert (Windows) is used to inspect the route and measure packet transit times.

155

How often do you conduct patch management?

Reference answer

I like to perform patch management as soon as it's released. From experience, I know that Windows patches are released monthly. I'd apply the patch to all of the organization's networks, devices, and servers within a month at most.

156

What is a TCP three-way handshake?

Reference answer

A TCP three-way handshake is a process that establishes a TCP connection between two devices. It involves a SYN packet, a SYN-ACK packet, and an ACK packet.

157

What is the difference between a penetration test and a security audit?

Reference answer

A penetration test focuses on simulating real-world cyberattacks to identify and exploit vulnerabilities in an organization's systems, providing insight into potential entry points for attackers. On the other hand, a security audit is a comprehensive review of an organization's policies, procedures, and controls to ensure compliance with regulatory standards and best practices, without actively attempting to exploit vulnerabilities. While both aim to improve security, a penetration test emphasizes practical exploitation, whereas a security audit focuses on strategic evaluation.

158

What is a CTF (Capture The Flag) competition?

Reference answer

CTF (Capture The Flag) is a cybersecurity competition where participants solve security-related challenges to find hidden 'flags' (text strings) that prove they've successfully completed a task. These challenges cover various domains including web exploitation, cryptography, reverse engineering, forensics, and binary exploitation. CTFs help develop practical hacking skills, problem-solving abilities, and teamwork, making them popular learning tools at conferences and in cybersecurity education.

159

You're Given One Domain & One IP. What's Your Approach?

Reference answer

Step 1 – Reconnaissance: WHOIS lookup, subdomain enumeration, ASN mapping, certificate transparency logs. Step 2 – Port & Service Scanning: Full port scans, service detection, version enumeration. Step 3 – Web Enumeration: Directory brute forcing, parameter discovery, API mapping. Step 4 – Vulnerability Mapping: CVE correlation, misconfigurations, default credentials. Step 5 – Exploitation & Pivoting: Initial access, privilege escalation, internal enumeration.

160

What is a Blue Team in cybersecurity?

Reference answer

A blue team is a group of security professionals who are responsible for defending an organization against cyber threats. The blue team is focused on detecting, responding to, and mitigating security incidents. They are the first line of defense in an organization's security strategy.

161

What types of penetration testing assessments are there?

Reference answer

Types of penetration testing assessments include Internal/External Infrastructure Penetration Testing, Wireless Penetration Testing, Web Application Penetration Testing, and Mobile Application Penetration Testing.

162

What are NetBIOS-based DoS (Denial of Service) attacks?

Reference answer

NetBIOS-based DoS (Denial of Service) attacks target the NetBIOS protocol, which is used for network communication in Windows systems. These attacks exploit vulnerabilities in NetBIOS services to disrupt or disable access to shared resources. Common methods include: - Flooding: Attackers send a large volume of requests to overwhelm the NetBIOS service, causing the system to become unresponsive. - Name Spoofing: By sending misleading or incorrect NetBIOS names, attackers can confuse the system or cause it to misroute data. - Port Scanning: Attackers scan NetBIOS ports (e.g., 137-139) to identify vulnerable systems and launch targeted DoS attacks. These attacks can cause network congestion, prevent access to shared resources, and disrupt communication between systems on the network. To defend against them, disabling unnecessary NetBIOS services and using firewalls to block suspicious traffic is recommended.

163

What is the principle of least privilege?

Reference answer

The principle of least privilege states that users and systems should be granted only the minimum permissions necessary to perform their tasks, reducing the risk of unauthorized access or damage.

164

What is lateral movement?

Reference answer

Lateral movement is the technique attackers use to move across systems within a network after initial access.

165

How would you describe Script kiddies?

Reference answer

Script kiddies are inexperienced hackers with limited technical skills who rely on pre-written scripts and tools developed by others. Typically young and impulsive, they are motivated more by thrill-seeking or causing disruption than by specific malicious goals or financial gain. These individuals use readily available hacking tools and exploits found online, often targeting vulnerable systems indiscriminately. They are generally viewed with contempt by more skilled hackers for their lack of originality and understanding of the techniques they employ.

166

How do you conduct a risk assessment for an organization?

Reference answer

Conducting a risk assessment starts with identifying and documenting all assets and their potential vulnerabilities. Next, evaluating the possible threats to these assets and the likelihood of these threats materializing is essential. Assessing the impact of each threat, in terms of both severity and likelihood, follows. After identifying and evaluating the risks, prioritizing them based on their potential impact and developing mitigation strategies is the next step. This may involve implementing new security measures, updating existing ones, or even redesigning certain systems.

167

How do you test the security of wireless networks?

Reference answer

Additional technical questions include: - Explain what cross site scripting (XSS) is and how you would test for it. - List three ways of maintaining access to a system during a penetration test. - How do you test the security of wireless networks?

168

What are some techniques to escalate privileges after gaining initial access in a network?

Reference answer

After gaining initial access, techniques to escalate privileges include identifying vulnerabilities such as weak configurations or outdated software. On Windows systems, token impersonation can be used, while on Linux, searching for misconfigured sudo privileges or SUID binaries is effective. In Active Directory environments, techniques like Kerberoasting or Pass-the-Hash attacks can escalate privileges by abusing the Kerberos protocol.

169

What is RDP?

Reference answer

The Remote Desktop Protocol (RDP) is a proprietary protocol developed by Microsoft which provides a user with a graphical interface to connect to another computer over a network connection. It runs on port 3389.

170

What are the phases of penetration testing?

Reference answer

The phases include planning and reconnaissance, scanning, exploitation, post-exploitation, and reporting.

171

What is cross-site scripting (XSS), and how can it be prevented?

Reference answer

XSS is a type of attack where an attacker injects malicious JavaScript code into a web application. It can be prevented by validating user input, using output encoding, and implementing content security policies.

172

Explain what Buffer Overflow is and how it's exploited.

Reference answer

Buffer Overflow happens when data exceeds memory limits, potentially allowing attackers to inject malicious code. Defense methods include proper validation, using safe functions, and employing ASLR (Address Space Layout Randomization).

173

Why is patch management critical for security

Reference answer

Unpatched systems often contain known vulnerabilities which attackers exploit easily without advanced skills.

174

How would you approach a penetration test for a small business versus a large enterprise?

Reference answer

A strong candidate will explain that the approach differs based on the organization's size, industry, and risk profile. For instance, financial institutions may require more rigorous testing due to regulatory requirements, while small businesses might need a more budget-conscious approach. They should discuss tailoring their methodology to address specific threats relevant to the industry, such as compliance standards for financial institutions or resource constraints for small businesses.

175

What is a DMZ?

Reference answer

A DMZ, or Demilitarized Zone, is a buffer network that sits between an internal network and external networks, such as the internet. It adds an extra layer of security by isolating sensitive systems from direct exposure to external threats. Services like web servers, email servers, or DNS servers are often placed in the DMZ to allow access from external users while keeping the internal network safeguarded.

176

Describe symmetric and asymmetric encryption.

Reference answer

Additional knowledge based questions include: - What is the difference between intrusion detection systems (IPS) and intrusion prevention systems (IDS)? Name an example of each. - Describe symmetric and asymmetric encryption. - What is a threat modeling system?

177

What would you do if you accidentally caused a denial of service?

Reference answer

Own your mistake. Immediately notify the client, stop further testing, and assist with recovery. Transparency and accountability are crucial.

178

What Is Identification and Authentication Failures Vulnerability?

Reference answer

Identification and authentication failures occur when security mechanisms fail to properly verify user identities. This vulnerability allows attackers to bypass authentication and gain unauthorized access to sensitive data. Penetration testers exploit these weaknesses to assess credential security, session management, and the effectiveness of authentication controls.

179

What are DDoS Trojans?

Reference answer

DDoS Trojans are a specific category of malware designed to turn infected machines into bots that launch DDoS attacks on command. Unlike standard DDoS tools, which are run deliberately by an attacker, DDoS Trojans spread themselves and quietly recruit devices, often without the device owner ever knowing. This is how large botnets are built.

180

What is WPA3, and how does it differ from WPA2?

Reference answer

WPA3 is the latest wireless security protocol, using a stronger encryption algorithm and improving individualized data encryption.

181

What is salting and what is it used for

Reference answer

Salting is a technique used to add random data that is used as an additional input when hashing data. Salting makes it harder for attackers to crack a hash as the is appended to the password before it is hashed, creating a much longer hash.

182

What is Sniffing in network security?

Reference answer

Sniffing is the process of capturing and analyzing network traffic for sensitive information.

183

What is the purpose of Penetration testing?

Reference answer

Penetration testing assists in identifying security flaws in the system before a hacker might exploit them or a user could discover them and report them. Finding flaws as quickly as possible during the software development lifespan is also simpler and more affordable.

184

How have you communicated complex ideas with other teams, departments, or clients in the past?

Reference answer

Communication is a key part of being a penetration tester. You will need to write reports and give presentations that communicate the findings of your testing to your client. A good way to demonstrate this skill is to draw on previous experiences where you have had to communicate with others and how you were effective at this. You can learn how to communicate with the SOC team in this article on What Is a Purple Team? (And How It Can Strengthen Security).

185

How Does DNS Enumeration Work?

Reference answer

DNS enumeration extracts domain intelligence like subdomains, name servers, mail servers, and IP mappings. Techniques include zone transfer attempts, brute-force subdomains, and reverse DNS lookup. Tools: DNSrecon, Amass, Sublist3r.

186

What is a security operations center (SOC)?

Reference answer

A security operations center (SOC) is a dedicated facility that houses a team of information security professionals. This team is responsible for continuously monitoring and analyzing an organization's security posture, and for detecting, analyzing, and responding to cybersecurity incidents in a timely manner. The SOC team may include security analysts, engineers, and managers who work closely with the incident response team and use various technology solutions and processes to protect the organization from cyber threats.

187

What is a cross-site scripting (XSS) attack, and how does it work?

Reference answer

A cross-site scripting (XSS) attack is a type of vulnerability that occurs when an attacker injects malicious JavaScript code into a web application, potentially allowing access to user data.

188

What is the difference between active and passive network sniffing?

Reference answer

Here's a table outlining the differences between Active and Passive network sniffing: Aspect | Active Network Sniffing | Passive Network Sniffing | | Definition | Involves actively injecting traffic into the network to capture data. | Involves monitoring network traffic without injecting any data. | | Impact on Network | Can disrupt or slow down the network due to injected traffic. | No impact on the network as it only observes traffic. | | Detection | Easier to detect since it generates additional traffic. | Harder to detect as it only observes traffic without interference. | | Tools | Tools like ARP spoofing or man-in-the-middle (MITM) attacks. | Tools like Wireshark or tcpdump. | | Usage | Often used for active attacks (e.g., intercepting, modifying data). | Commonly used for passive monitoring and traffic analysis. | | Risks | Higher risk of detection and legal consequences. | Lower risk of detection and safer for legitimate monitoring. | Active sniffing involves injecting packets into the network, while passive sniffing only observes traffic, making the latter more discreet.

189

How do you approach a full penetration test?

Reference answer

A professional pen test follows a clear structure: Reconnaissance: Passive and active information gathering Scanning & Enumeration: Identifying live hosts, open ports, and running services Exploitation: Attempting to exploit discovered vulnerabilities Post-Exploitation: Assessing what an attacker could do once inside Reporting: Documenting findings, risk ratings, and remediation steps The final report is just as important as the technical work, it's what the client actually acts on.

190

How are penetration testing skills evaluated in interviews?

Reference answer

Interviews assess conceptual knowledge, tool familiarity, real-world scenarios, and ethical judgment.

191

What is the difference between RPO and RTO?

Reference answer

The recovery point objective (RPO) deals with the backup frequency and the recovery time objective (RTO) with the recovery timeline. During a system outage, RPO and RTO can determine the impact of the downtime on business operations. RPO is a measure of how frequently you take backups and indicates the amount of data that will be lost or needed to be reentered after an outage. RTO, on the other hand, is the amount of downtime a business can afford. It determines how long it might take for a system to recover after a business disruption.

192

What is an Advanced Persistent Threat (APT)?

Reference answer

APTs are prolonged, targeted cyber attacks aimed at stealing sensitive information. They often go undetected for long periods, with attackers using advanced techniques to evade detection.

193

What is cross-site scripting (XSS)?

Reference answer

Cross-site scripting (XSS) is a web security vulnerability that allows attackers to inject malicious scripts into web pages viewed by other users. When a vulnerable website accepts user input without proper sanitization, attackers can embed JavaScript code that executes in the victim's browser, potentially stealing sensitive information or hijacking their accounts.

194

What Are the Different Penetration Testing Methodologies?

Reference answer

There are three main methodologies: black-box, white-box, and gray-box testing. Black-box testing provides no prior knowledge of the system, making it realistic. White-box testing offers full access to the internal structure. Gray-box testing gives partial information, balancing realism and efficiency for identifying vulnerabilities.

195

What is the importance of penetration testing in identifying indicators of compromise (IOCs)?

Reference answer

Penetration testing can help organizations identify IOCs, which are signs of potential security incidents, and develop strategies to respond to them.

196

What is Defense in Depth?

Reference answer

Defense in Depth (DiD) in Cybersecurity involves a series of defensive mechanisms that are layered for the purpose of securing valuable data and information. In case one mechanism fails, another one will start to work immediately to thwart unprecedented attacks. DiD's multi-layered approach, which is also referred to as the castle approach, tightens up the security of a system.

197

How do you use Nmap effectively?

Reference answer

Effective Nmap usage includes: - Proper timing options - Service detection - Script scanning - OS fingerprinting - Output formats

198

What tools would you use to perform testing against WiFi networks

Reference answer

Tools for WiFi testing include Aircrack-ng, Reaver, Kismet, and Wifite.

199

What is NTLM Relay?

Reference answer

NTLM relay captures authentication requests and relays them to another service. Used when SMB signing disabled, LDAP signing weak, or HTTP relay possible. Leads to unauthorized authentication and privilege escalation.

200

How would you handle finding a vulnerable web application during a penetration test?

Reference answer

If you find a vulnerable web application, you would first examine the vulnerability to understand what it affects and how it could be exploited. You document all observations clearly, noting the steps to reproduce the issue and its potential risks. Then you report this to the client or supervisor and suggest practical ways to fix it, such as updating the software, changing configurations, and strengthening access controls. Throughout testing, you ensure that the application continues to function and that no damage occurs.

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Most Common Interview Questions for Pen Testers | SPOTO

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Most Common Interview Questions for Pen Testers | SPOTO

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