The answer is error-based SQL injection. This is the correct choice because error-based SQL injection is an in-band technique where the attacker leverages verbose database error messages displayed directly in the HTTP response to extract sensitive information like table names and column names. When a web application fails to handle exceptions properly, the database server returns detailed error output that reveals schema details, allowing the tester to map out the database structure without needing blind inference. On the Certified Ethical Hacker CEH exam, this question tests your ability to distinguish between in-band, inferential, and out-of-band injection types; a common trap is confusing error-based with blind SQL injection, but remember that blind techniques do not return visible error details. For a quick memory tip, think “errors expose the schema” — if you see database names in the response, it’s error-based, not blind.
CEH Web Application and Injection Attacks Practice Question
This CEH practice question tests your understanding of web application and injection 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 security analyst observes a web application returning database error messages containing table names and column names in the HTTP response. Which type of SQL injection is MOST likely being exploited?
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
✓
Error-based SQL injection
Error-based SQL injection (in-band) relies on error messages from the database to extract information. The presence of database details in errors indicates error-based injection.
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.
✗
Blind SQL injection (boolean-based)
Why it's wrong here
Boolean-based blind SQLi does not show error details; it relies on true/false responses.
✗
Union-based SQL injection
Why it's wrong here
Union-based SQLi uses UNION queries to retrieve data, but does not necessarily rely on errors.
✓
Error-based SQL injection
Why this is correct
Error-based SQL injection uses database error messages to extract information.
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.
✗
Out-of-band SQL injection
Why it's wrong here
Out-of-band SQLi uses alternate channels (e.g., DNS) and does not show errors in HTTP responses.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
Boolean-based blind SQLi does not show error details; it relies on true/false responses.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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.
Identify which CEH exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Web Application and Injection Attacks — This question tests Web Application and Injection Attacks — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Error-based SQL injection — Error-based SQL injection (in-band) relies on error messages from the database to extract information. The presence of database details in errors indicates error-based injection.
What should I do if I get this CEH question wrong?
Identify which CEH exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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