The answer is the server returning a 200 OK status code, as this indicates the HTTP request was processed without a server-side error, which is a hallmark of a successful SQL injection. When an attacker’s injected SQL statements execute correctly, the database often returns unexpected data or verbose error messages embedded directly in the response body, confirming that the malicious input was interpreted and output was retrieved. On the Certified Ethical Hacker CEH exam, this concept tests your ability to distinguish between a failed injection (which typically triggers a 500 Internal Server Error) and a successful one where the server accepts the payload and returns data. A common trap is assuming any error code confirms success, but a 200 OK with anomalous content—like database dumps or login bypasses—is the true indicator. Memory tip: “200 with content, the injection was meant; 500 with noise, avoid the decoys.”
CEH Network and Web Application Attacks Practice Question
This CEH practice question tests your understanding of network and web application attacks. 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.
A penetration tester is analyzing a captured TCP session that includes a successful SQL injection attack. Which TWO of the following indicators would most likely confirm that the attack was successful?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The response contains database error messages or unexpected data
Option C is correct because a successful SQL injection often results in the database returning error messages or unexpected data directly in the HTTP response, confirming that the attacker's injected SQL statements were executed and returned results. This is a direct indicator of a successful attack, as the server processes the malicious input and includes database output in the response body.
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.
✗
The server redirects to a login page (302)
Why it's wrong here
A redirect to login usually occurs after a failed authentication, not a successful SQL injection.
✗
The server returns a 500 Internal Server Error
Why it's wrong here
500 error typically indicates a syntax or runtime error, which may mean the injection failed or caused an error.
✓
The response contains database error messages or unexpected data
Why this is correct
Database error messages or extra data in the response are strong indicators of successful injection.
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.
✓
The server returns a 200 OK status code
Why this is correct
200 OK often indicates the injected query executed successfully and returned data.
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.
✗
The client receives no response (timeout)
Why it's wrong here
No response often indicates the injection caused a crash or infinite loop, not success.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often mistake a 500 Internal Server Error (Option B) as a sign of success, but in CEH and real-world analysis, a 500 error usually indicates a failed or crashing injection, not a successful data extraction.
Detailed technical explanation
How to think about this question
Under the hood, a successful SQL injection exploits improper input sanitization in SQL queries, allowing an attacker to break out of the intended query structure and execute arbitrary SQL commands. The server's response may include database error messages (e.g., MySQL's 'You have an error in your SQL syntax') or unexpected data rows (e.g., UNION-based injection returning extra records), which are visible in the HTTP response body. In real-world scenarios, attackers often use blind SQL injection techniques when error messages are suppressed, but here the presence of error messages or unexpected data in the response is a clear sign of a successful in-band injection.
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 practitioner preparing for the CEH exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CEH question in full detail.
Network and Web Application Attacks — This question tests Network and Web Application Attacks — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The response contains database error messages or unexpected data — Option C is correct because a successful SQL injection often results in the database returning error messages or unexpected data directly in the HTTP response, confirming that the attacker's injected SQL statements were executed and returned results. This is a direct indicator of a successful attack, as the server processes the malicious input and includes database output in the response body.
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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Question Discussion
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