The answer is to check the application logs for database error messages. This is the correct immediate action because SQL injection attempts, such as those containing the "1=1--" payload, often trigger verbose database errors—like MySQL syntax errors or ODBC codes—that confirm the injection point by correlating the WAF alert with actual backend behavior. On the CISSP exam, this scenario tests your understanding of passive validation versus active exploitation; a common trap is to recommend re-scanning or probing the live system, which violates the principle of due care and could cause damage. Instead, the exam emphasizes using existing evidence—like application logs—to validate SQL injection via logs without introducing risk. Memory tip: think "Logs before exploits"—always check the backend breadcrumbs before touching the live system.
CISSP Security Assessment and Testing Practice Question
This CISSP practice question tests your understanding of security assessment and testing. 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 is reviewing logs from a web application firewall (WAF) and notices multiple requests containing the payload "1=1--" in the query string. The analyst suspects a SQL injection attack. Which of the following is the BEST immediate action to validate the suspicion?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check the application logs for database error messages.
Checking the application logs for database error messages is the best immediate action because SQL injection attempts often trigger verbose database errors (e.g., MySQL syntax errors, ODBC error codes) that confirm the injection point. This passive validation requires no additional tools and directly correlates the WAF alert with backend behavior, avoiding the risk of actively exploiting a live system.
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 a manual SQL injection tool like sqlmap to test the application.
Why it's wrong here
Using automated SQL injection tools can cause damage or be considered intrusive without proper authorization.
✗
Implement prepared statements in the application code.
Why it's wrong here
This is a permanent fix, not an immediate validation step.
✗
Run a vulnerability scan with a SQL injection detection module.
Why it's wrong here
Vulnerability scanning is not immediate and may not be the best first step.
✓
Check the application logs for database error messages.
Why this is correct
Application logs may show database errors that confirm successful injection.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose an active testing tool (Option A) or a remediation step (Option B) instead of recognizing that passive log review is the safest and most immediate validation method in a security assessment context.
Detailed technical explanation
How to think about this question
When a SQL injection payload like '1=1--' is submitted, the WAF may log the request but cannot confirm if the backend database processed it. Database error messages (e.g., 'Incorrect syntax near '1'') in application logs provide definitive proof that the input reached the SQL interpreter and caused a parse failure, which is a hallmark of a successful injection attempt. In a real-world scenario, analysts often correlate WAF logs with web server error logs (e.g., Apache error_log or IIS HTTPERR) to distinguish between blocked requests and those that bypassed the WAF.
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 security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CISSP question in full detail.
Security Assessment and Testing — This question tests Security Assessment and Testing — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Check the application logs for database error messages. — Checking the application logs for database error messages is the best immediate action because SQL injection attempts often trigger verbose database errors (e.g., MySQL syntax errors, ODBC error codes) that confirm the injection point. This passive validation requires no additional tools and directly correlates the WAF alert with backend behavior, avoiding the risk of actively exploiting a live system.
What should I do if I get this CISSP 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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