The answer is exploiting kernel vulnerabilities, such as the Dirty Cow (CVE-2016-5195) race condition, which is a classic Linux privilege escalation technique. This works because the Linux kernel operates at the highest privilege level (ring 0), so a flaw like a use-after-free or race condition in a syscall handler allows an attacker to execute arbitrary code with kernel-level privileges, effectively granting root access. On the CompTIA PenTest+ PT0-002 exam, this concept tests your ability to identify post-exploitation vectors beyond simple misconfigurations; a common trap is confusing kernel exploits with user-space attacks like SUID binary abuse. Remember that kernel exploits target the core of the OS, not just its permissions. Memory tip: “Kernel cracks give root access—Dirty Cow is the classic hack.”
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.
Which THREE of the following are example of privilege escalation techniques on Linux systems? (Select THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Exploiting kernel vulnerabilities
Exploiting kernel vulnerabilities (Option A) is a privilege escalation technique because the Linux kernel operates with the highest system privileges (ring 0). A vulnerability in the kernel, such as a use-after-free or race condition in a syscall handler, can allow an attacker to execute arbitrary code with kernel-level privileges, effectively gaining root access. Common examples include the Dirty Cow (CVE-2016-5195) vulnerability, which exploited a race condition in the memory subsystem to achieve local privilege escalation.
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.
✓
Exploiting kernel vulnerabilities
Why this is correct
Kernel exploits can grant root-level access.
Related concept
Read the scenario before looking for a memorised answer.
✓
Exploiting SUID binary vulnerabilities
Why this is correct
SUID binaries run with elevated privileges; misconfigurations can allow escalation.
Related concept
Read the scenario before looking for a memorised answer.
✗
Token manipulation
Why it's wrong here
Token manipulation is specific to Windows access tokens.
✓
Sudo misconfiguration exploitation
Why this is correct
If a user has sudo rights on vulnerable commands, root access can be gained.
Related concept
Read the scenario before looking for a memorised answer.
✗
Pass-the-hash
Why it's wrong here
Pass-the-hash is a Windows lateral movement technique.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the distinction between Windows-specific and Linux-specific privilege escalation techniques, so the trap here is that candidates may mistakenly apply Windows concepts like token manipulation or pass-the-hash to Linux environments, where they are not valid.
Detailed technical explanation
How to think about this question
SUID binaries (Option B) are a Linux-specific mechanism where the set-user-ID permission bit (chmod u+s) allows a binary to run with the privileges of its owner (often root). Exploiting a vulnerable SUID binary, such as one with a buffer overflow or insecure environment variable handling (e.g., PATH injection), can grant an attacker a root shell. Sudo misconfiguration (Option D) often involves granting excessive privileges via the /etc/sudoers file, such as allowing a user to run commands like /bin/su or /usr/bin/vi as root without a password, which can be trivially exploited to spawn a root shell.
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 security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
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: Exploiting kernel vulnerabilities — Exploiting kernel vulnerabilities (Option A) is a privilege escalation technique because the Linux kernel operates with the highest system privileges (ring 0). A vulnerability in the kernel, such as a use-after-free or race condition in a syscall handler, can allow an attacker to execute arbitrary code with kernel-level privileges, effectively gaining root access. Common examples include the Dirty Cow (CVE-2016-5195) vulnerability, which exploited a race condition in the memory subsystem to achieve local privilege escalation.
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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Question Discussion
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