Quick Answer
The answer is mounting partitions like /tmp and /var with the nosuid option, as this directly prevents privilege escalation by neutralizing SUID and SGID binaries. This configuration blocks the set-user-identifier and set-group-identifier bits from taking effect on any files stored in those directories, which is critical because attackers frequently place malicious SUID binaries in world-writable locations to gain elevated privileges. On the Systems Security Certified Practitioner SSCP exam, this concept tests your understanding of Linux hardening controls and common attack vectors; a frequent trap is assuming that removing all SUID binaries is more effective, but that approach can break legitimate system functionality and is less sustainable. The nosuid mount option proactively neutralizes the threat without requiring constant maintenance. Memory tip: think “no SUID on shared spaces” — if a directory is writable by anyone, it should never honor SUID bits.
This SSCP practice question tests your understanding of systems and application security. 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 system administrator needs to ensure that a Linux server is hardened against common attacks. Which configuration change is MOST effective in preventing privilege escalation via SUID binaries?
Enable auditd to log all SUID executions.
Why wrong: Logging is detective, not preventive.
Set the umask to 077 for all users.
Why wrong: Controls default file permissions but does not affect existing SUID binaries.
Mount the /tmp and /var partitions with the 'nosuid' option.
Prevents execution of SUID binaries on those partitions.
Remove all SUID binaries from the system.
Why wrong: May break functionality; not practical.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Mount the /tmp and /var partitions with the 'nosuid' option.
Mounting partitions like /tmp and /var with the 'nosuid' option prevents SUID and SGID bits from taking effect on files stored there. Since attackers often place malicious SUID binaries in world-writable directories to escalate privileges, this configuration blocks the execution of such binaries regardless of their permissions. This is more effective than logging or removing all SUID binaries, as it proactively neutralizes a common attack vector without breaking system functionality.
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.
Enable auditd to log all SUID executions.
Why it's wrong here
Logging is detective, not preventive.
Set the umask to 077 for all users.
Why it's wrong here
Controls default file permissions but does not affect existing SUID binaries.
Mount the /tmp and /var partitions with the 'nosuid' option.
Why this is correct
Prevents execution of SUID binaries on those partitions.
Related concept
Read the scenario before looking for a memorised answer.
Remove all SUID binaries from the system.
Why it's wrong here
May break functionality; not practical.
Common exam traps
The trap here is that candidates may think logging (auditd) or removing all SUID binaries is a viable solution, but the exam tests the understanding that 'nosuid' is a practical, targeted control that prevents exploitation without breaking legitimate system functionality.
Detailed technical explanation
The SUID (Set User ID) bit allows a binary to execute with the privileges of its file owner (typically root) rather than the user who runs it. Attackers frequently place SUID binaries in world-writable directories like /tmp to exploit this. The 'nosuid' mount option is enforced at the filesystem level by the kernel's VFS layer, ignoring the SUID and SGID bits on any executable within that mount point. This is defined in the mount(2) system call and is a standard hardening practice per CIS benchmarks and DISA STIGs for Linux systems.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
What to study next
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FAQ
Systems and Application Security — This question tests Systems and Application Security — Read the scenario before looking for a memorised answer..
The correct answer is: Mount the /tmp and /var partitions with the 'nosuid' option. — Mounting partitions like /tmp and /var with the 'nosuid' option prevents SUID and SGID bits from taking effect on files stored there. Since attackers often place malicious SUID binaries in world-writable directories to escalate privileges, this configuration blocks the execution of such binaries regardless of their permissions. This is more effective than logging or removing all SUID binaries, as it proactively neutralizes a common attack vector without breaking system functionality.
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 11, 2026
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