The answer is offline password cracking. This is the correct choice because the /etc/shadow file stores hashed user passwords, and when it is readable by a low-privilege user, those hashes can be copied and attacked locally using tools like John the Ripper or Hashcat, bypassing account lockout policies and network latency. On the CompTIA PenTest+ PT0-002 exam, this scenario tests your understanding of privilege escalation vectors and the distinction between online brute-force attacks and offline hash cracking—a common trap is confusing this with a live password-spraying attack. Remember that readable shadow files are a direct invitation to crack offline, not to guess passwords on the live system. A useful memory tip: "If you can read the shadow, crack it offline on your own meadow."
PT0-002 Attacks and Exploits Practice Question
This PT0-002 practice question tests your understanding of attacks and exploits. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A penetration tester has compromised a Linux server and gained a low-privilege shell. The tester discovers that the /etc/shadow file is readable by the tester's user. Which attack is most directly enabled by this finding?
Why wrong: Pass-the-hash is a Windows-specific attack that uses NTLM hashes to authenticate without the plaintext password. It is not applicable to Linux shadow hashes.
B
Password cracking offline
Reading /etc/shadow directly enables offline password cracking because the hashes can be extracted and attacked with tools like John the Ripper or Hashcat.
C
LLMNR poisoning
Why wrong: LLMNR poisoning is a Windows network attack that captures hashes by responding to name resolution requests. It does not leverage a readable shadow file.
D
Kerberoasting
Why wrong: Kerberoasting targets Kerberos service tickets in Active Directory environments, not Linux shadow hashes.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Password cracking offline
The /etc/shadow file contains the hashed passwords for all users on the system. If a low-privilege user can read this file, they can copy the password hashes and attempt to crack them offline using tools like John the Ripper or Hashcat. This directly enables an offline password cracking attack, as the tester can brute-force or use dictionary attacks against the hashes without needing to interact with the live system.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Pass-the-hash
Why it's wrong here
Pass-the-hash is a Windows-specific attack that uses NTLM hashes to authenticate without the plaintext password. It is not applicable to Linux shadow hashes.
✓
Password cracking offline
Why this is correct
Reading /etc/shadow directly enables offline password cracking because the hashes can be extracted and attacked with tools like John the Ripper or Hashcat.
Related concept
Read the scenario before looking for a memorised answer.
✗
LLMNR poisoning
Why it's wrong here
LLMNR poisoning is a Windows network attack that captures hashes by responding to name resolution requests. It does not leverage a readable shadow file.
✗
Kerberoasting
Why it's wrong here
Kerberoasting targets Kerberos service tickets in Active Directory environments, not Linux shadow hashes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse the ability to read a password hash file with a pass-the-hash attack, but pass-the-hash is a Windows-specific technique that requires NTLM hashes and a network authentication context, not a local file read on Linux.
Detailed technical explanation
How to think about this question
Linux password hashes in /etc/shadow typically use the $id$salt$hash format, where $id indicates the hash algorithm (e.g., $6$ for SHA-512). Offline cracking leverages the fact that the attacker can iterate through password guesses locally, hashing each with the same salt and comparing to the stored hash, which is orders of magnitude faster than online brute-force due to no network latency or account lockout policies. In real-world scenarios, misconfigured permissions (e.g., 644 on /etc/shadow) often result from legacy systems or container misconfigurations, making this a common finding in internal penetration tests.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A SOC analyst notices unusual lateral movement in the network at 2 AM. The IR playbook dictates: identify and contain (isolate the affected machine), then eradicate (remove the malware), then recover (restore from backup), then document. Skipping containment before eradication risks the attacker regaining access. Questions like this test the sequence and rationale of incident response phases.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PT0-002 question in full detail.
Attacks and Exploits — This question tests Attacks and Exploits — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Password cracking offline — The /etc/shadow file contains the hashed passwords for all users on the system. If a low-privilege user can read this file, they can copy the password hashes and attempt to crack them offline using tools like John the Ripper or Hashcat. This directly enables an offline password cracking attack, as the tester can brute-force or use dictionary attacks against the hashes without needing to interact with the live system.
What should I do if I get this PT0-002 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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