- A
Validate all input to ensure it meets length constraints
Correct: Input validation that enforces length constraints prevents data from exceeding buffer capacity, directly stopping buffer overflows.
- B
Implement stack canaries
Why wrong: Incorrect: Stack canaries detect buffer overflows at runtime but do not prevent the vulnerability from existing.
- C
Obfuscate the code to make exploitation harder
Why wrong: Incorrect: Obfuscation makes exploitation harder but does not address the underlying buffer overflow flaw.
- D
Enable Address Space Layout Randomization (ASLR)
Why wrong: Incorrect: ASLR randomizes memory addresses, making exploitation less reliable, but does not prevent the overflow.
- E
Use functions that perform bounds checking (e.g., strncpy instead of strcpy)
Correct: Using functions that perform bounds checking (e.g., strncpy) limits data copied and prevents buffer overflows.
Secure Coding Practices to Prevent Buffer Overflow
This SSCP practice question tests your understanding of input validation. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: input Validation. 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.
Which TWO of the following are effective measures to prevent buffer overflow attacks in software development?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Validate all input to ensure it meets length constraints
Options A and E are correct. Input validation with length constraints (A) directly prevents buffer overflows by ensuring data does not exceed buffer boundaries. Bounds-checking functions like strncpy (E) also prevent overflows by limiting data copy. Stack canaries (B) detect overflows but do not prevent them; code obfuscation (C) hinders exploitation but does not prevent the vulnerability; ASLR (D) randomizes memory addresses but does not stop the overflow itself.
Key principle: Input Validation
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Validate all input to ensure it meets length constraints
Why this is correct
Correct: Input validation that enforces length constraints prevents data from exceeding buffer capacity, directly stopping buffer overflows.
Related concept
Input Validation
- ✗
Implement stack canaries
Why it's wrong here
Incorrect: Stack canaries detect buffer overflows at runtime but do not prevent the vulnerability from existing.
- ✗
Obfuscate the code to make exploitation harder
Why it's wrong here
Incorrect: Obfuscation makes exploitation harder but does not address the underlying buffer overflow flaw.
- ✗
Enable Address Space Layout Randomization (ASLR)
Why it's wrong here
Incorrect: ASLR randomizes memory addresses, making exploitation less reliable, but does not prevent the overflow.
- ✓
Use functions that perform bounds checking (e.g., strncpy instead of strcpy)
Why this is correct
Correct: Using functions that perform bounds checking (e.g., strncpy) limits data copied and prevents buffer overflows.
Related concept
Input Validation
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.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Input Validation
- Bounds Checking
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
Input Validation
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.
Review input Validation, then practise related SSCP questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this SSCP question test?
Input Validation
What is the correct answer to this question?
The correct answer is: Validate all input to ensure it meets length constraints — Options A and E are correct. Input validation with length constraints (A) directly prevents buffer overflows by ensuring data does not exceed buffer boundaries. Bounds-checking functions like strncpy (E) also prevent overflows by limiting data copy. Stack canaries (B) detect overflows but do not prevent them; code obfuscation (C) hinders exploitation but does not prevent the vulnerability; ASLR (D) randomizes memory addresses but does not stop the overflow itself.
What should I do if I get this SSCP question wrong?
Review input Validation, then practise related SSCP questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Input Validation
About these practice questions
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Same concept, more angles
1 more ways this is tested on SSCP
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which TWO of the following are effective measures to prevent buffer overflow attacks in a custom-developed application?
easy- ✓ A.Input validation
- B.Using unpatched third-party libraries
- C.Running the application with least privilege
- D.Disabling ASLR
- ✓ E.Stack canaries
Why A: Input validation helps ensure data fits within buffer limits, and stack canaries detect and prevent stack-based buffer overflows. Using unpatched libraries increases vulnerability; disabling ASLR makes exploitation easier; running with least privilege limits damage but does not prevent the overflow itself.
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Last reviewed: Jun 24, 2026
This SSCP practice question is part of Courseiva's free ISC2 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 SSCP exam.
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