Quick Answer
The correct answer is SUID/GUID abuse and kernel exploits, as both are foundational techniques for Linux privilege escalation. SUID/GUID abuse occurs when an executable file with the set-user-ID or set-group-ID bit set runs with the owner’s or group’s privileges, allowing a low-privileged user to execute it and gain elevated access if the binary is misconfigured or exploitable. Kernel exploits, on the other hand, target vulnerabilities in the Linux kernel—such as buffer overflows or race conditions—to execute arbitrary code with root privileges, bypassing all user-level security controls because the kernel operates at the highest system level. On the Certified Ethical Hacker CEH exam, this question tests your ability to distinguish between direct privilege escalation vectors and common distractors like password cracking or service misconfigurations. A frequent trap is confusing SUID abuse with simple file permissions; remember that only files with the SUID bit set (visible as an ‘s’ in the owner’s execute position) are relevant. For a memory tip, think “SUID sticks up privileges, kernel kicks down doors.”
This CEH practice question tests your understanding of enumeration and system hacking. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Which TWO techniques are commonly used for privilege escalation on Linux systems? (Select two.)
Kernel exploits
Exploiting kernel vulnerabilities to gain root.
SUID/GUID abuse
Exploiting binaries with SUID/GUID set.
Token impersonation
Why wrong: Token impersonation is more common on Windows.
DLL hijacking
Why wrong: DLL hijacking is a Windows technique.
Pass-the-hash
Why wrong: Pass-the-hash is for lateral movement, not privilege escalation.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Kernel exploits
Kernel exploits (A) are a common privilege escalation technique on Linux because they target vulnerabilities in the kernel itself, allowing an attacker to execute arbitrary code with root privileges. By exploiting flaws such as buffer overflows or race conditions in kernel modules, an attacker can elevate from a low-privileged user to full root access. This is a classic method because the kernel runs with the highest system privileges, and a successful exploit bypasses all user-level security controls.
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.
Kernel exploits
Why this is correct
Exploiting kernel vulnerabilities to gain root.
Related concept
Read the scenario before looking for a memorised answer.
SUID/GUID abuse
Why this is correct
Exploiting binaries with SUID/GUID set.
Related concept
Read the scenario before looking for a memorised answer.
Token impersonation
Why it's wrong here
Token impersonation is more common on Windows.
DLL hijacking
Why it's wrong here
DLL hijacking is a Windows technique.
Pass-the-hash
Why it's wrong here
Pass-the-hash is for lateral movement, not privilege escalation.
Common exam traps
EC-Council often tests the distinction between Windows-specific and Linux-specific privilege escalation techniques, and the trap here is that candidates may confuse token impersonation or pass-the-hash as cross-platform methods, when they are strictly tied to Windows authentication and security models.
Detailed technical explanation
SUID/GUID abuse (B) works by exploiting executables with the setuid or setgid bit set, which run with the file owner's or group's privileges (e.g., root) regardless of the calling user. Common examples include misconfigured binaries like 'passwd' or custom scripts with the SUID bit, which can be leveraged to spawn a root shell or read sensitive files. Under the hood, the kernel checks the effective UID (eUID) against the file's owner UID when the SUID bit is set, and tools like 'find / -perm -4000' are used to locate such binaries during enumeration.
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: Kernel exploits — Kernel exploits (A) are a common privilege escalation technique on Linux because they target vulnerabilities in the kernel itself, allowing an attacker to execute arbitrary code with root privileges. By exploiting flaws such as buffer overflows or race conditions in kernel modules, an attacker can elevate from a low-privileged user to full root access. This is a classic method because the kernel runs with the highest system privileges, and a successful exploit bypasses all user-level security controls.
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 30, 2026
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