- A
Use cron job misconfigurations to execute a reverse shell
Why wrong: Cron misconfigurations are another privilege escalation vector, but this requires writable cron scripts or directories. The question specifically indicates docker group membership, which is a more direct and reliable privilege escalation method.
- B
Exploit kernel vulnerabilities using a local exploit suggester
Why wrong: Kernel exploits can be used, but they rely on unpatched vulnerabilities and may impact system stability. The docker group escalation is a simpler, more reliable method.
- C
Run a Docker container with the host filesystem mounted and access it as root
By running a Docker container with the host filesystem mounted (e.g., `docker run -v /:/mnt -it alpine chroot /mnt`), the user can access all host files as root because Docker effectively runs as root. This bypasses normal privilege restrictions.
- D
Abuse SETUID binaries to execute commands as root
Why wrong: Exploiting SETUID binaries is a privilege escalation technique, but it requires a vulnerable binary. Docker group membership provides a more direct path.
Quick Answer
The answer is to run a Docker container with the host filesystem mounted and access it as root. This technique works because membership in the 'docker' group grants the user permission to execute Docker commands without sudo, and by default, containers run as the root user. Using the `-v /:/mnt` flag mounts the entire host filesystem into the container, giving the tester full read/write access to critical host files from inside the container, such as `/mnt/etc/shadow` or `/mnt/root/.ssh/authorized_keys`. On the CompTIA PenTest+ PT0-002 exam, this scenario tests your understanding of Linux privilege escalation vectors tied to group memberships, specifically the dangerous default of Docker’s root-equivalent access. A common trap is assuming you need to break out of the container first; instead, the mount bypasses that entirely. Memory tip: think “Docker group = root group” and remember the flag `-v /:/mnt` as “volume the whole host into the container.”
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 gains a low-privileged shell on a Linux server and discovers that the user is a member of the 'docker' group. The tester wants to escalate privileges to root. Which technique is most effective?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Run a Docker container with the host filesystem mounted and access it as root
Option C is correct because members of the 'docker' group can run Docker containers with the `-v /:/mnt` flag to mount the host filesystem into the container. Inside the container, the user effectively has root privileges (since the container runs as root by default) and can access the host's `/mnt` directory, allowing them to modify files like `/mnt/etc/shadow` or add an SSH key to `/mnt/root/.ssh/authorized_keys` to gain root access on the host.
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.
- ✗
Use cron job misconfigurations to execute a reverse shell
Why it's wrong here
Cron misconfigurations are another privilege escalation vector, but this requires writable cron scripts or directories. The question specifically indicates docker group membership, which is a more direct and reliable privilege escalation method.
- ✗
Exploit kernel vulnerabilities using a local exploit suggester
Why it's wrong here
Kernel exploits can be used, but they rely on unpatched vulnerabilities and may impact system stability. The docker group escalation is a simpler, more reliable method.
- ✓
Run a Docker container with the host filesystem mounted and access it as root
Why this is correct
By running a Docker container with the host filesystem mounted (e.g., `docker run -v /:/mnt -it alpine chroot /mnt`), the user can access all host files as root because Docker effectively runs as root. This bypasses normal privilege restrictions.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Abuse SETUID binaries to execute commands as root
Why it's wrong here
Exploiting SETUID binaries is a privilege escalation technique, but it requires a vulnerable binary. Docker group membership provides a more direct path.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the misconception that kernel exploits are always the fastest path to root, but the trap here is that membership in the 'docker' group is a trivial and reliable escalation vector that bypasses the need for kernel exploitation or other complex techniques.
Detailed technical explanation
How to think about this question
Under the hood, Docker's default behavior runs containers with root privileges inside the container, and the `--privileged` flag or volume mounts like `-v /:/host` bypass user namespace remapping. In real-world assessments, this technique is often used in CTFs and penetration tests because it requires no additional exploits—just a single `docker run -v /:/mnt -it alpine` command, followed by `chroot /mnt` to become root on the host. A subtle behavior is that even without the `--privileged` flag, a volume mount of the host root gives full write access to the host filesystem, which is sufficient for privilege escalation.
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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this PT0-002 question test?
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: Run a Docker container with the host filesystem mounted and access it as root — Option C is correct because members of the 'docker' group can run Docker containers with the `-v /:/mnt` flag to mount the host filesystem into the container. Inside the container, the user effectively has root privileges (since the container runs as root by default) and can access the host's `/mnt` directory, allowing them to modify files like `/mnt/etc/shadow` or add an SSH key to `/mnt/root/.ssh/authorized_keys` to gain root access on the host.
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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Last reviewed: Jun 30, 2026
This PT0-002 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PT0-002 exam.
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