Quick Answer
The correct answer is that the binary will run with root privileges when executed by any user. This is because the SUID (Set User ID) bit, when set on a binary owned by root, forces the system to execute it with the effective user ID of the file owner—root—rather than the ID of the user launching it. On the Certified Ethical Hacker CEH exam, this concept tests your understanding of Linux privilege escalation vectors, a common focus in the system hacking domain. A frequent trap is confusing the SUID bit with the SGID bit or assuming the binary only runs with elevated privileges for the owner; in reality, any user inherits root’s effective permissions. To remember this, think of the ‘s’ in the permission string -rwsr-xr-x as “switch to owner,” meaning the binary swaps the user’s identity to root’s during execution.
This CEH practice question tests your understanding of enumeration and system hacking. 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 finds that a Linux binary has the SUID bit set and is owned by root. Which of the following does this indicate?
The binary is immutable and cannot be deleted
Why wrong: Immutable attribute is separate.
The binary can be executed only by the root user
Why wrong: SUID allows any user to run it with root privileges.
The binary is a symbolic link to a root-owned file
Why wrong: SUID is a permission, not a link.
The binary will run with root privileges when executed by any user
SUID bit causes the program to run with the file owner's permissions.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The binary will run with root privileges when executed by any user
When the SUID (Set User ID) bit is set on a binary owned by root, the binary executes with the effective user ID of the file owner (root), regardless of which user runs it. This allows any user to run the binary with root privileges, which is why option D is correct. The SUID bit is represented by an 's' in the owner's execute position (e.g., -rwsr-xr-x).
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.
The binary is immutable and cannot be deleted
Why it's wrong here
Immutable attribute is separate.
The binary can be executed only by the root user
Why it's wrong here
SUID allows any user to run it with root privileges.
The binary is a symbolic link to a root-owned file
Why it's wrong here
SUID is a permission, not a link.
The binary will run with root privileges when executed by any user
Why this is correct
SUID bit causes the program to run with the file owner's permissions.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse the SUID bit with execution restrictions (option B) or file immutability (option A), but the SUID bit specifically grants privilege escalation, not access control or file protection.
Detailed technical explanation
The SUID bit works at the kernel level by temporarily changing the effective UID (EUID) of the process to the file owner's UID during execution, as defined in the POSIX standard. A real-world scenario is the 'passwd' command, which has the SUID bit set so that non-root users can modify the /etc/shadow file (owned by root) to change their own passwords. A subtle behavior is that SUID does not work on interpreted scripts (e.g., shell scripts) on many Linux distributions due to security hardening, but it works on compiled binaries.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
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: The binary will run with root privileges when executed by any user — When the SUID (Set User ID) bit is set on a binary owned by root, the binary executes with the effective user ID of the file owner (root), regardless of which user runs it. This allows any user to run the binary with root privileges, which is why option D is correct. The SUID bit is represented by an 's' in the owner's execute position (e.g., -rwsr-xr-x).
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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