Question 349 of 509

Attacks and Exploits →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is to use Docker to mount the entire host filesystem and modify the root password. This technique works because membership in the 'docker' group is effectively root-equivalent access on Linux; the Docker daemon runs as root, and any group member can issue commands to mount arbitrary host paths into a container. By running a container with the host filesystem mounted (e.g., `docker run -v /:/mnt --privileged -it alpine chroot /mnt`), you can directly edit `/etc/shadow` or reset the root password, escalating privileges without any additional exploit. On the CompTIA PenTest+ PT0-002 exam, this tests your understanding of Linux privilege escalation vectors and the dangerous misconfiguration of Docker group membership—a common trap is assuming Docker access is sandboxed, when in reality it bypasses standard user permissions. Memory tip: "Docker in the group? Root in the soup."

PT0-002 Attacks and Exploits Practice Question

This PT0-002 practice question tests your understanding of attacks and exploits. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.

During a penetration test, a tester gains shell access on a Linux server as a low-privileged user. The user is identified to be a member of the 'docker' group. Which technique is most effective for escalating privileges to root?

Question 1mediummultiple choice

Full question →

A
Use docker to mount the entire host filesystem and modify the root password.
Running 'docker run -v /:/mnt -it ubuntu bash' mounts the host root filesystem. From inside the container, the attacker can chroot to /mnt and modify /etc/shadow or add an SSH authorized key, gaining full root access.
B
Use docker to run a container with network host mode to access internal services.
Why wrong: While network host mode can be useful for reconnaissance, it does not directly escalate privileges to root. It allows network-level access but not file system control.
C
Use docker to pull a malicious image from the internet to compromise other containers.
Why wrong: Pulling malicious images could affect the container ecosystem but does not automatically grant root access on the host. The goal is host-level privilege escalation.
D
Use docker to create a new user with root privileges inside a container.
Why wrong: Creating a root user inside a container only grants root within that container, not on the host. The attacker needs host-level access.

Full breakdown with real-world context →

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

✓

Use docker to mount the entire host filesystem and modify the root password.

Membership in the 'docker' group grants the user effective root-equivalent access because the Docker daemon runs as root and allows any member of the 'docker' group to issue commands that can mount arbitrary host paths. By running a container with the host filesystem mounted (e.g., `docker run -v /:/mnt --privileged -it alpine chroot /mnt`), the tester can directly modify the `/etc/shadow` file or the root password, thereby escalating privileges to root without needing any additional exploit.

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 docker to mount the entire host filesystem and modify the root password.
Why this is correct
Running 'docker run -v /:/mnt -it ubuntu bash' mounts the host root filesystem. From inside the container, the attacker can chroot to /mnt and modify /etc/shadow or add an SSH authorized key, gaining full root access.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use docker to run a container with network host mode to access internal services.
Why it's wrong here
While network host mode can be useful for reconnaissance, it does not directly escalate privileges to root. It allows network-level access but not file system control.
✗
Use docker to pull a malicious image from the internet to compromise other containers.
Why it's wrong here
Pulling malicious images could affect the container ecosystem but does not automatically grant root access on the host. The goal is host-level privilege escalation.
✗
Use docker to create a new user with root privileges inside a container.
Why it's wrong here
Creating a root user inside a container only grants root within that container, not on the host. The attacker needs host-level access.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may think Docker group membership only allows container management or network manipulation, overlooking the fact that the Docker socket grants full root-equivalent file system access via volume mounts.

Detailed technical explanation

How to think about this question

The Docker daemon runs with root privileges, and any user in the 'docker' group can communicate with the Docker API socket (`/var/run/docker.sock`). By using the `-v` flag to bind-mount the host's root filesystem into a container, the user gains read-write access to all host files, including `/etc/shadow` and `/etc/passwd`. A common real-world technique is to run `docker run -v /:/host -it alpine chroot /host` and then execute `passwd root` or directly edit the shadow file to set a known password hash, achieving immediate root access.

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.

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: Use docker to mount the entire host filesystem and modify the root password. — Membership in the 'docker' group grants the user effective root-equivalent access because the Docker daemon runs as root and allows any member of the 'docker' group to issue commands that can mount arbitrary host paths. By running a container with the host filesystem mounted (e.g., `docker run -v /:/mnt --privileged -it alpine chroot /mnt`), the tester can directly modify the `/etc/shadow` file or the root password, thereby escalating privileges to root without needing any additional exploit.

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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