Quick Answer
The correct answer is SUID abuse. This technique works because the SUID (Set User ID) bit on a binary owned by root forces the system to execute that binary with the file owner’s privileges—root—regardless of which user launches it. When such a binary spawns a shell, that shell inherits root-level access, enabling immediate privilege escalation. On the Certified Ethical Hacker CEH exam, this concept tests your understanding of Linux permission misconfigurations, often appearing in scenario-based questions where you must identify why a standard user can suddenly run commands as root. A common trap is confusing SUID with SGID or sticky bits, so remember that SUID grants the owner’s permissions, not the group’s. For a quick memory tip, think “SUID = Super User ID” to recall that it escalates to the binary’s owner, typically root.
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.
During a security assessment, you find a Linux binary with the SUID bit set and owned by root. You execute it and obtain a root shell. This is an example of which privilege escalation technique?
DLL hijacking
Why wrong: DLL hijacking is a Windows technique; SUID is Linux-specific.
Kernel exploit
Why wrong: A kernel exploit targets kernel vulnerabilities; the scenario describes exploiting a SUID binary.
Token impersonation
Why wrong: Token impersonation is a Windows technique involving access tokens, not SUID abuse.
SUID abuse
Correct. SUID bit abuse allows executing a binary with the owner's (root) privileges.
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 abuse
Option D is correct because the SUID (Set User ID) bit on a binary owned by root allows it to execute with root privileges regardless of the user running it. When you execute such a binary and it spawns a shell, that shell inherits the elevated privileges, effectively granting you a root shell. This is a classic example of SUID abuse, a common privilege escalation technique on Linux systems.
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.
DLL hijacking
Why it's wrong here
DLL hijacking is a Windows technique; SUID is Linux-specific.
Kernel exploit
Why it's wrong here
A kernel exploit targets kernel vulnerabilities; the scenario describes exploiting a SUID binary.
Token impersonation
Why it's wrong here
Token impersonation is a Windows technique involving access tokens, not SUID abuse.
SUID abuse
Why this is correct
Correct. SUID bit abuse allows executing a binary with the owner's (root) privileges.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates may confuse SUID abuse with a kernel exploit, thinking any root shell from a binary must involve a kernel vulnerability, but SUID abuse is a misconfiguration-based technique that does not require exploiting kernel code.
Trap categories for this question
Scenario analysis trap
A kernel exploit targets kernel vulnerabilities; the scenario describes exploiting a SUID binary.
Detailed technical explanation
The SUID bit (chmod u+s) changes the effective user ID (EUID) to the file owner (root) during execution, as defined in the POSIX standard. When a binary like /bin/bash has the SUID bit set, it runs with EUID=0, and if it spawns a shell without dropping privileges (e.g., via system() or execve()), the resulting shell retains root access. A real-world example is the 'nmap --interactive' exploit, where older versions of nmap with SUID root allowed spawning a root shell.
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 abuse — Option D is correct because the SUID (Set User ID) bit on a binary owned by root allows it to execute with root privileges regardless of the user running it. When you execute such a binary and it spawns a shell, that shell inherits the elevated privileges, effectively granting you a root shell. This is a classic example of SUID abuse, a common privilege escalation technique on Linux systems.
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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