The answer is time-based blind SQL injection. This technique is the most appropriate because it allows the tester to extract data from the database without generating any visible error messages or database output, which could trigger alerts from a Web Application Firewall (WAF) or Intrusion Detection System (IDS). Instead, the tester infers true or false conditions by observing response timing, using commands like WAITFOR DELAY in SQL Server or SLEEP() in MySQL to create measurable delays. On the CompTIA PenTest+ PT0-002 exam, this question tests your understanding of stealthy data exfiltration methods when error-based or union-based injections are too noisy. A common trap is choosing error-based SQL injection, which would immediately alert defenders. Remember the memory tip: “Time tells the truth”—if the server pauses, the condition is true.
PT0-002 Attacks and Exploits Practice Question
This PT0-002 practice question tests your understanding of attacks and exploits. 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.
During a web application penetration test, a tester identifies a potential SQL injection vulnerability in a search field. The tester wants to extract data from the database without generating error messages that could trigger an alert. Which technique is most appropriate?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Blind SQL injection (time-based)
Option C is correct because blind SQL injection (time-based) allows data extraction without generating visible error messages or database output. By using conditional time delays (e.g., IF condition THEN WAITFOR DELAY '0:0:5' in SQL Server or SLEEP(5) in MySQL), the tester can infer true/false conditions based on response timing, avoiding any error-based alerts that might be monitored by a WAF or IDS.
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.
✗
In-band SQL injection
Why it's wrong here
In-band SQL injection uses the same channel to return data, often resulting in visible output that may trigger alerts.
✗
Error-based SQL injection
Why it's wrong here
Error-based injection generates database error messages to extract data, which can be noisy and trigger alerts.
✓
Blind SQL injection (time-based)
Why this is correct
Time-based blind injection uses time delays to infer data without generating errors, making it stealthy.
Related concept
Read the scenario before looking for a memorised answer.
✗
Union-based SQL injection
Why it's wrong here
Union-based injection combines results with the original query, often displaying data in the application output, which may be detected.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose error-based or union-based injection because they are more familiar, failing to recognize that the question explicitly requires avoiding error messages and alerts, which only time-based blind injection achieves.
Trap categories for this question
Command / output trap
In-band SQL injection uses the same channel to return data, often resulting in visible output that may trigger alerts.
Detailed technical explanation
How to think about this question
Time-based blind SQL injection works by injecting a conditional statement that causes a measurable delay (e.g., 5 seconds) only when a condition is true. The tester can then iterate through characters of a database value (e.g., using SUBSTRING and ASCII comparisons) to exfiltrate data bit by bit. In real-world scenarios, this technique is critical when the application suppresses all output and error messages, such as in hardened environments with custom error pages or WAFs that block error-based payloads.
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 PT0-002 question in full detail.
Attacks and Exploits — This question tests Attacks and Exploits — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Blind SQL injection (time-based) — Option C is correct because blind SQL injection (time-based) allows data extraction without generating visible error messages or database output. By using conditional time delays (e.g., IF condition THEN WAITFOR DELAY '0:0:5' in SQL Server or SLEEP(5) in MySQL), the tester can infer true/false conditions based on response timing, avoiding any error-based alerts that might be monitored by a WAF or IDS.
What should I do if I get this PT0-002 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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Question Discussion
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