The correct choice is to craft a request with a local file inclusion parameter pointing to /etc/passwd, as this safely confirms an RFI vulnerability without causing damage. This approach works because the tester is leveraging the same underlying file inclusion mechanism—user-supplied input processed by the server—but using a local file instead of a remote one. If the server returns the contents of /etc/passwd, it proves the application dynamically includes files based on user input, which is the core behavior of both LFI and RFI flaws. On the CEH exam, this question tests your understanding of safe validation techniques; a common trap is assuming you must use a remote URL to test RFI, which could trigger malicious downloads or server-side requests. Instead, remember that proving the inclusion logic exists is sufficient, and using a harmless local file avoids network risks. Memory tip: "Local proof, remote risk"—test the inclusion mechanism locally to confirm the vulnerability before ever attempting a remote exploit.
CEH Vulnerability Analysis and System Hacking Practice Question
This CEH practice question tests your understanding of vulnerability analysis and system hacking. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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.
An ethical hacker is assessing a Linux web server running Apache. The server is suspected to have a remote file inclusion (RFI) vulnerability. Which testing approach is most appropriate to confirm the vulnerability without causing damage?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Craft a request with a local file inclusion parameter pointing to /etc/passwd
Option A is correct because it uses a local file inclusion (LFI) parameter to test for file inclusion without causing damage. By attempting to include /etc/passwd, the tester can verify if the server processes user-supplied input to include files, which is a direct indicator of an RFI vulnerability if the server returns the file contents. This approach is safe and non-destructive, as it only reads a standard system file.
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.
✓
Craft a request with a local file inclusion parameter pointing to /etc/passwd
Why this is correct
This safely confirms RFI by reading a local file, proving the vulnerability.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use SQLMap to test for SQL injection
Why it's wrong here
SQLMap tests for SQLi, not RFI.
✗
Scan the server with Nikto to detect known RFI signatures
Why it's wrong here
Nikto can detect potential RFI, but manual verification is needed.
✗
Attempt to include a remote URL containing a web shell
Why it's wrong here
This could compromise the server and is not a safe test.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse RFI with LFI or think that using a web shell is acceptable for confirmation, but the CEH exam emphasizes non-destructive testing and ethical boundaries, making a local file inclusion test the correct first step.
Detailed technical explanation
How to think about this question
Remote file inclusion (RFI) vulnerabilities occur when an application dynamically includes external files based on user input without proper sanitization, often via PHP's include() or require() functions. Testing with a local file like /etc/passwd leverages the same underlying mechanism but uses a local resource, avoiding the need for an external server and reducing risk. In real-world scenarios, RFI can be chained with other vulnerabilities, such as log poisoning, to achieve code execution, but initial confirmation should always be non-destructive.
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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CEH question in full detail.
Vulnerability Analysis and System Hacking — This question tests Vulnerability Analysis and System Hacking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Craft a request with a local file inclusion parameter pointing to /etc/passwd — Option A is correct because it uses a local file inclusion (LFI) parameter to test for file inclusion without causing damage. By attempting to include /etc/passwd, the tester can verify if the server processes user-supplied input to include files, which is a direct indicator of an RFI vulnerability if the server returns the file contents. This approach is safe and non-destructive, as it only reads a standard system file.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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