Quick Answer
The answer is SUID/GUID abuse, as the command output showing `uid=0(root)` confirms the attacker has escalated to root privileges. This technique works because SUID (Set User ID) and GUID (Group ID) bits allow an executable to run with the permissions of its owner—typically root—rather than the user who launches it. When a standard user executes a misconfigured SUID binary, such as a vulnerable custom script or a system tool like `passwd`, the process inherits root-level UID and GID, enabling command execution with full system access. On the Certified Ethical Hacker CEH exam, this scenario tests your understanding of Linux privilege escalation vectors, often appearing in practical lab questions where you must identify the exploitation method from a simple `id` or `whoami` output. A common trap is confusing SUID with sticky bits or misreading the permission string; remember that `rws` in the owner’s execute field indicates SUID. Memory tip: “SUID gives you the owner’s ID—if root owns it, you’re root.”
This CEH practice question tests your understanding of enumeration and system hacking. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 security analyst reviews the following command output from a Linux system: `uid=0(root) gid=0(root) groups=0(root)`. The analyst suspects a privilege escalation attack. Which of the following techniques could have been used to achieve root access from a standard user account?
Token impersonation
Why wrong: Token impersonation is a Windows technique, not Linux.
Pass-the-hash attack
Why wrong: Pass-the-hash is a Windows network authentication attack.
LLMNR/NBT-NS poisoning
Why wrong: This is a network attack for credential harvesting, not local privilege escalation.
SUID/GUID abuse
Exploiting a SUID binary can elevate privileges to root.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
SUID/GUID abuse
The command output shows the current user has UID 0, which is the root user. On Linux, SUID (Set User ID) and GUID (Group ID) bits allow executables to run with the permissions of the file owner (e.g., root). A standard user can exploit a misconfigured SUID binary (like `passwd` or a custom script) to execute commands with root privileges, achieving privilege escalation. This is a classic Linux privilege escalation technique directly tied to the UID/GID output shown.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Token impersonation
Why it's wrong here
Token impersonation is a Windows technique, not Linux.
Pass-the-hash attack
Why it's wrong here
Pass-the-hash is a Windows network authentication attack.
LLMNR/NBT-NS poisoning
Why it's wrong here
This is a network attack for credential harvesting, not local privilege escalation.
SUID/GUID abuse
Why this is correct
Exploiting a SUID binary can elevate privileges to root.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates confuse Windows-specific attacks (token impersonation, pass-the-hash, LLMNR poisoning) with Linux privilege escalation, failing to recognize that the `uid=0` output is a direct indicator of root access achieved via SUID/GUID abuse.
Detailed technical explanation
SUID abuse works because when the SUID bit is set on an executable (e.g., `chmod u+s`), the kernel temporarily elevates the effective UID to the file owner's UID during execution. Common misconfigurations include SUID binaries owned by root that allow arbitrary command execution (e.g., `nmap --interactive` or custom scripts with `#!/bin/bash`). The `find / -perm -4000` command is often used to enumerate such binaries, and tools like GTFOBins document known exploitable SUID binaries.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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FAQ
Enumeration and System Hacking — This question tests Enumeration and System Hacking — Read the scenario before looking for a memorised answer..
The correct answer is: SUID/GUID abuse — The command output shows the current user has UID 0, which is the root user. On Linux, SUID (Set User ID) and GUID (Group ID) bits allow executables to run with the permissions of the file owner (e.g., root). A standard user can exploit a misconfigured SUID binary (like `passwd` or a custom script) to execute commands with root privileges, achieving privilege escalation. This is a classic Linux privilege escalation technique directly tied to the UID/GID output shown.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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