PT0-002 Timed Practice Test 4 — 10 Questions

Question 1

A penetration tester wants to discover all subdomains of a target domain without directly querying the target's DNS servers to avoid detection. Which technique is most appropriate?

Accepted Answer

Passive DNS enumeration using public data sources. Passive DNS enumeration leverages public data sources such as certificate transparency logs, search engine caches, and passive DNS databases (e.g., VirusTotal, SecurityTrails) to discover subdomains without sending any queries to the target's authoritative DNS servers. This approach avoids generating DNS traffic that could be logged or detected by the target's monitoring systems, making it ideal for stealthy reconnaissance.

Answer

DNS zone transfer

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Brute-force subdomain enumeration using a wordlist

Answer

SNMP community string enumeration

Question 2

A penetration testing firm is scoping a test for a client that has a hybrid infrastructure with on-premises servers and cloud-based virtual machines. The client insists on testing only the on-premises systems due to budget constraints. Which of the following should the penetration tester emphasize during the scoping discussion?

Accepted Answer

Limiting the scope to on-premises may result in an incomplete risk picture because cloud systems are part of the attack surface.. Option C is correct because the client's hybrid infrastructure means that cloud-based virtual machines are part of the overall attack surface, and limiting the scope to on-premises systems ignores potential attack vectors such as misconfigured cloud APIs, insecure inter-VPC routing, or compromised cloud credentials that could lead to lateral movement into on-premises systems. A penetration test must assess all components that can be exploited to provide a complete risk picture, as cloud systems often serve as entry points or pivot points into the on-premises environment.

Answer

The on-premises systems are more critical, so testing them is sufficient.

Answer

Cloud systems are generally more secure and do not require testing.

Answer

Testing cloud systems would violate the shared responsibility model.

Question 3

During a penetration test, a tester gains access to a Linux server as a low-privileged user. The server has a cron job that executes a script owned by root but writable by the tester's group. Which privilege escalation technique should the tester use?

Accepted Answer

Cron job exploitation via script modification. The cron job executes a script owned by root but writable by the tester's group. This means the tester can modify the script's contents. When the cron job runs (as root), the modified script executes with root privileges, allowing the tester to gain a root shell or execute arbitrary commands as root. This is a classic cron job exploitation via script modification.

Answer

Kernel exploit

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Misconfigured sudo permissions

Answer

Path hijacking in the cron job

Question 4

A penetration tester is attempting a pass-the-hash (PtH) attack against a Windows domain-joined machine. The tester has obtained the NTLM hash of a local administrator account. Which tool can be used directly to authenticate using the hash to gain remote command execution?

Accepted Answer

Metasploit's psexec module. Metasploit's psexec module (exploit/windows/smb/psexec) directly accepts an NTLM hash via the 'SMBPass' option and uses it to authenticate over SMB, then creates a service on the target to execute commands. This is a classic pass-the-hash technique against Windows systems, as the module leverages the SMB protocol and Windows service control manager without needing the plaintext password.

Answer

John the Ripper

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Mimikatz

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Nmap

Question 5

A penetration tester is performing active reconnaissance on a target network. The tester sends TCP SYN packets to a range of ports on a target host. Only a few ports respond with SYN-ACK packets. What does this indicate?

Accepted Answer

The ports that responded with SYN-ACK are open.. The TCP three-way handshake begins with a SYN packet; a SYN-ACK response indicates that the target port received the SYN and is willing to establish a connection, meaning the port is open and listening. Only ports that respond with SYN-ACK are confirmed open, while others may be closed or filtered, but the presence of any SYN-ACK replies directly indicates open ports.

Answer

The host is protected by a firewall that drops all packets.

Answer

The host is running a stealthy IDS.

Answer

The network is using IPv6.

Question 6

A penetration tester is conducting passive reconnaissance on a target organization. The tester wants to identify all publicly accessible cloud storage buckets that might belong to the target without directly interacting with the target's infrastructure. Which of the following techniques would be most effective for this purpose?

Accepted Answer

Search for exposed cloud storage buckets using search engine dorks (e.g., 'site:s3.amazonaws.com target-company'). Option B is correct because search engine dorks allow a penetration tester to query publicly indexed content on cloud storage platforms like AWS S3 without sending any traffic to the target's infrastructure. By using a dork such as 'site:s3.amazonaws.com target-company', the tester leverages the search engine's pre-cached index to identify buckets that may be misconfigured or publicly accessible, which aligns perfectly with passive reconnaissance requirements.

Answer

Perform DNS enumeration using tools like `dnsrecon` to discover subdomains pointing to cloud storage services

Answer

Query certificate transparency logs to find SSL certificates issued to the target's cloud storage endpoints

Answer

Perform a WHOIS lookup to find IP ranges owned by the target and then scan those ranges for open storage services

Question 7

A penetration tester is testing a web application that uses JSON Web Tokens (JWTs) for authentication. The tester discovers that the server does not verify the JWT signature properly. The tester crafts a JWT with an arbitrary payload and sets the algorithm to 'none'. Which attack does this enable?

Accepted Answer

Authentication bypass. Option C is correct because setting the JWT algorithm to 'none' removes all cryptographic verification. If the server does not validate the signature, it will accept a token with an arbitrary payload, allowing the attacker to impersonate any user without knowing the secret key. This directly results in an authentication bypass, as the server trusts the forged token.

Answer

SQL injection

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Server-side request forgery

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Cross-site request forgery

Question 8

A penetration tester is using Burp Suite to test a web application. The tester notices that the application relies on client-side JavaScript validation to restrict input. To bypass this validation and test for server-side vulnerabilities, which Burp Suite feature is MOST useful for automatically modifying requests before they are sent to the server?

Accepted Answer

Proxy (with Match and Replace rules). The Proxy's Match and Replace rules allow the tester to automatically modify HTTP requests in transit, such as stripping or altering client-side validation parameters (e.g., maxlength, pattern attributes) before they reach the server. This bypasses client-side JavaScript restrictions because the modifications occur after the browser's validation but before the request is forwarded to the server, enabling direct testing of server-side input handling.

Answer

Intruder

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Repeater

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Decoder

Question 9

A penetration tester is writing a Bash script to enumerate users from the /etc/passwd file on a compromised Linux system. Which command will efficiently print only the usernames?

Accepted Answer

cut -d: -f1 /etc/passwd. Option A is correct because the `cut` command with `-d:` sets the field delimiter to colon (the separator in /etc/passwd) and `-f1` extracts the first field, which is the username. This is the most efficient and straightforward method for this specific task, as it directly isolates the username column without pattern matching or processing overhead.

Answer

awk -F: '{print $1}' /etc/passwd

Answer

grep -o '^[^:]*' /etc/passwd

Answer

sed 's/:.*//' /etc/passwd

Question 10

A penetration tester is performing a vulnerability scan on a web server that uses HTTPS. The tester wants to identify the server's SSL/TLS configuration weaknesses without overwhelming the server. Which Nmap command is most appropriate?

Accepted Answer

nmap -sV --script ssl-enum-ciphers -p 443 target. Option A is correct because the `ssl-enum-ciphers` NSE script enumerates all supported SSL/TLS ciphers and protocols on the target, providing a detailed assessment of cryptographic weaknesses (e.g., weak ciphers, outdated TLS versions). The `-sV` flag enables version detection, and `-p 443` targets the HTTPS port, while the script itself is designed to be lightweight and not overwhelm the server, making it ideal for a non-intrusive vulnerability scan.

Answer

nmap -sT -A -T4 -p 443 target

Answer

nmap -sU -p 443 target

Answer

nmap -sC -p 443 target