- A
Use the `netcat` tool to establish a reverse shell back to the attacker
Why wrong: That would give another low-privileged shell, not escalation. Escalation requires gaining higher privileges.
- B
Search for and exploit a SUID binary that allows privilege escalation
SUID binaries execute with the owner's privileges. If a binary like `find` or `vim` has SUID set, it can be exploited to run commands as root.
- C
Use a password cracking tool like John the Ripper on the system's shadow file
Why wrong: You already have a shell; cracking passwords might help but is indirect; SUID exploitation is more direct and common for escalation.
- D
Perform a brute force attack on the root password
Why wrong: Brute forcing root password is noisy and time-consuming; SUID exploitation is more efficient.
Quick Answer
The answer is to search for and exploit a SUID binary that allows privilege escalation. This technique is effective because SUID (Set User ID) binaries execute with the file owner’s permissions, and on a misconfigured Linux system, a low-privileged user can run a SUID-root binary—such as `find`, `vim`, or `nmap—to spawn a root shell directly. On the Certified Ethical Hacker CEH exam, this concept tests your understanding of Linux privilege escalation techniques and common misconfigurations; a typical trap is assuming you need a kernel exploit or credentials, when a simple `find / -perm -4000` scan reveals the path to root. Remember the mnemonic “SUID Spawns Root” to recall that any binary with the SUID bit set and an interactive shell escape can escalate privileges instantly.
CEH Enumeration and System Hacking Practice Question
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.
During a penetration test, you successfully gain access to a web server with a low-privileged shell. You want to escalate privileges to root. Which of the following techniques is MOST likely to achieve privilege escalation on a misconfigured Linux system?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Search for and exploit a SUID binary that allows privilege escalation
Option B is correct because SUID (Set User ID) binaries execute with the privileges of the file owner, typically root. On a misconfigured Linux system, a low-privileged user can run a SUID-root binary (e.g., `find`, `vim`, `nmap`) to spawn a shell with root privileges, directly achieving privilege escalation without needing credentials or additional exploits.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use the `netcat` tool to establish a reverse shell back to the attacker
Why it's wrong here
That would give another low-privileged shell, not escalation. Escalation requires gaining higher privileges.
- ✓
Search for and exploit a SUID binary that allows privilege escalation
Why this is correct
SUID binaries execute with the owner's privileges. If a binary like `find` or `vim` has SUID set, it can be exploited to run commands as root.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use a password cracking tool like John the Ripper on the system's shadow file
Why it's wrong here
You already have a shell; cracking passwords might help but is indirect; SUID exploitation is more direct and common for escalation.
- ✗
Perform a brute force attack on the root password
Why it's wrong here
Brute forcing root password is noisy and time-consuming; SUID exploitation is more efficient.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse establishing a reverse shell (which maintains the current privilege level) with privilege escalation, or they assume password cracking is feasible without first obtaining the hashed password file.
Detailed technical explanation
How to think about this question
SUID binaries are identified with `find / -perm -4000 -type f 2>/dev/null`. A classic example is the `find` binary with SUID root: executing `find . -exec /bin/sh -p \;` spawns a root shell because the `-p` flag preserves the effective UID. In real-world engagements, misconfigured SUID binaries like `pkexec` (CVE-2021-4034) or custom scripts are common escalation vectors.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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
Questions learners often ask
What does this CEH question test?
Enumeration and System Hacking — This question tests Enumeration and System Hacking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Search for and exploit a SUID binary that allows privilege escalation — Option B is correct because SUID (Set User ID) binaries execute with the privileges of the file owner, typically root. On a misconfigured Linux system, a low-privileged user can run a SUID-root binary (e.g., `find`, `vim`, `nmap`) to spawn a shell with root privileges, directly achieving privilege escalation without needing credentials or additional exploits.
What should I do if I get this CEH question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Same concept, more angles
1 more ways this is tested on CEH
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A penetration tester successfully gains access to a Linux server as a low-privilege user. The goal is to escalate to root. Which THREE methods could the tester use to achieve privilege escalation?
easy- A.Enumerate SUID binaries with 'find / -perm -4000'
- ✓ B.Exploit a vulnerable SUID binary to spawn a root shell
- ✓ C.Use 'sudo -l' to list allowed commands and exploit misconfigurations
- D.Check /etc/shadow for weak password hashes
- ✓ E.Run a local kernel exploit that matches the kernel version
Why B: Options B, C, and D are correct. Exploiting SUID binaries, kernel exploits, and sudo misconfigurations are common Linux privilege escalation techniques. A and E are enumeration steps, not escalation methods.
Last reviewed: Jun 24, 2026
This CEH practice question is part of Courseiva's free EC-Council certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CEH exam.
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