The correct answer is to rewrite the legacy module to use parameterized queries. This is the definitive defense because parameterized queries, also known as prepared statements, enforce a strict separation between SQL logic and user-supplied data, ensuring that input is always treated as a literal value rather than executable code. By eliminating the dangerous practice of concatenating user input directly into a query, you remove the root cause of the vulnerability at the application layer. On the Systems Security Certified Practitioner SSCP exam, this question tests your understanding of secure coding practices and the principle of defense in depth; a common trap is choosing input validation or escaping as the best fix, but those are secondary controls that can be bypassed. Remember the mnemonic: “Separate to sanitize”—parameterized queries separate data from commands, which is why they are the gold standard for SQL injection prevention.
SSCP Systems and Application Security Practice Question
This SSCP practice question tests your understanding of systems and application security. 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 notices that a web application is vulnerable to SQL injection. The application uses parameterized queries for most inputs but concatenates user input directly into a query for a legacy module. Which is the BEST immediate remediation?
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
✓
Rewrite the legacy module to use parameterized queries.
Option B is correct because parameterized queries (prepared statements) are the definitive defense against SQL injection, as they separate SQL logic from user data by design. Rewriting the legacy module to use parameterized queries eliminates the root cause of the vulnerability at the code level, ensuring that user input is never concatenated into the SQL statement. This is the most secure and permanent fix, as it directly addresses the injection point in the application layer.
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.
✗
Disable the legacy module until a full rewrite is completed.
Why it's wrong here
May cause business disruption; immediate fix is possible.
✓
Rewrite the legacy module to use parameterized queries.
Why this is correct
Parameterized queries prevent SQL injection by separating code from data.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Deploy a web application firewall (WAF) to block SQL injection patterns.
Why it's wrong here
WAF can be bypassed and is not a permanent fix.
✗
Implement input validation to reject special characters.
Why it's wrong here
Input validation is not sufficient; it can be bypassed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the misconception that a WAF or input validation is sufficient to prevent SQL injection, but the trap here is that only parameterized queries (or stored procedures with parameterized calls) eliminate the vulnerability at the code level, making them the best immediate remediation over compensating controls.
Detailed technical explanation
How to think about this question
Parameterized queries work by pre-compiling the SQL statement with placeholders (e.g., '?' or ':param') and then binding user input as data, not executable code. This ensures that even if an attacker supplies malicious input like ' OR 1=1 --, it is treated as a literal string value, not as SQL syntax. In contrast, input validation alone fails because it relies on blacklisting patterns, which can be evaded with techniques such as hex encoding, Unicode normalization, or using SQL comments to bypass filters.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Systems and Application Security — This question tests Systems and Application Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Rewrite the legacy module to use parameterized queries. — Option B is correct because parameterized queries (prepared statements) are the definitive defense against SQL injection, as they separate SQL logic from user data by design. Rewriting the legacy module to use parameterized queries eliminates the root cause of the vulnerability at the code level, ensuring that user input is never concatenated into the SQL statement. This is the most secure and permanent fix, as it directly addresses the injection point in the application layer.
What should I do if I get this SSCP 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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