The answer is numeric injection, as it directly bypasses a single quote filter by exploiting parameters that expect numeric input. This technique works because SQL injection payloads like `OR 1=1` require no quote characters when the vulnerable field is an integer or numeric value, allowing the attacker to manipulate the query logic without triggering the filter. On the CompTIA PenTest+ PT0-002 exam, this concept tests your ability to recognize that input validation often targets string delimiters, but numeric fields remain exposed—a common trap is overcomplicating with encoded quotes when a simple numeric injection suffices. Remember that any time you see a filter blocking single quotes, check if the parameter expects a number; if so, you can inject directly with no quotes needed. A useful memory tip: "No quotes, no problem—numeric injection is the silent bypass."
PT0-002 Attacks and Exploits Practice Question
This PT0-002 practice question tests your understanding of attacks and exploits. 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 testing a web application that has input validation blocking single quotes. The tester wants to perform a SQL injection attack. Which of the following techniques would be MOST effective to bypass the filter?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Using a payload without quotes, such as numeric injection
Option D is correct because numeric injection does not require quotes at all, directly bypassing the single-quote filter. When the vulnerable parameter expects a numeric value (e.g., an ID), the tester can inject SQL logic like `OR 1=1` without any quotes, making it the most effective technique against input validation that blocks single quotes.
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.
✗
Using URL encoding for the single quote (%27)
Why it's wrong here
URL encoding is often decoded by the application before validation, so it may still be blocked.
✗
Using double quotes instead of single quotes
Why it's wrong here
SQL uses single quotes for string literals; double quotes are for identifiers and may not work in the same context.
✗
Using a second-order SQL injection
Why it's wrong here
Second-order injection requires another input to store malicious data, which may also be subject to the same filter.
✓
Using a payload without quotes, such as numeric injection
Why this is correct
If the input is used in a numeric context (e.g., WHERE id=5), quoting is not needed, allowing injection without single quotes.
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 assume URL encoding or alternative quote characters will bypass the filter, but they overlook that the filter operates on the decoded input or that SQL syntax strictly requires single quotes for string delimiters.
Detailed technical explanation
How to think about this question
Numeric injection works because the vulnerable parameter is used directly in a SQL query without quotes, e.g., `SELECT * FROM users WHERE id = $input`. The tester can inject `1 OR 1=1` to manipulate the query logic. In real-world scenarios, filters often block only specific characters like single quotes, but numeric contexts remain exploitable, making this a common bypass technique in SQL injection testing.
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 analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
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: Using a payload without quotes, such as numeric injection — Option D is correct because numeric injection does not require quotes at all, directly bypassing the single-quote filter. When the vulnerable parameter expects a numeric value (e.g., an ID), the tester can inject SQL logic like `OR 1=1` without any quotes, making it the most effective technique against input validation that blocks single quotes.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This PT0-002 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PT0-002 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.