The answer is deploying application-layer input validation and sanitization for barcode scanner inputs. This is the most appropriate risk mitigation strategy because the vulnerability stems directly from unvalidated input, which allows malware injection into the POS system. By implementing input validation at the application layer, the system ensures that only expected, safe data is processed, effectively neutralizing injection attacks at their point of entry. On the CRISC exam, this scenario tests your understanding of risk response options—specifically, the difference between preventive controls like input validation and compensating or detective controls. A common trap is choosing network segmentation or encryption, which address data in transit but not the root cause of malicious input. Remember the memory tip: “Validate at the gate, not the wall”—fix the input source, not just the network perimeter.
CRISC IT Risk Identification Practice Question
This CRISC practice question tests your understanding of it risk identification. 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.
A retail company recently deployed a point-of-sale (POS) system that processes credit card transactions. The system is connected to the corporate network and transmits transaction data to a payment processor over the internet. During a risk assessment, the IT risk manager identifies that the POS system is vulnerable to malware injection via unvalidated input from barcode scanners. Which of the following is the MOST appropriate risk mitigation strategy?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deploy application-layer input validation and sanitization for barcode scanner inputs.
Option D is the most appropriate risk mitigation strategy because the vulnerability is specifically malware injection via unvalidated input from barcode scanners. Application-layer input validation and sanitization directly addresses the root cause by ensuring that only expected, safe data is processed by the POS system, preventing injection attacks at the point of entry.
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.
✗
Encrypt all transaction data in transit using TLS 1.2.
Why it's wrong here
Encryption protects data during transmission, not input validation.
✗
Install a next-generation firewall at the internet boundary.
Why it's wrong here
Firewalls at the perimeter do not inspect internal traffic to the POS system.
✗
Implement network segmentation to isolate the POS system from the corporate network.
Why it's wrong here
Network segmentation reduces impact but does not prevent injection.
✓
Deploy application-layer input validation and sanitization for barcode scanner inputs.
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 network-level controls like firewalls or encryption, overlooking that the vulnerability originates from local input that never traverses the network boundary.
Detailed technical explanation
How to think about this question
Input validation and sanitization should be implemented at the application layer, often using allowlists (whitelists) of acceptable characters or patterns, and rejecting any input that does not conform. For barcode scanners, this means validating that the scanned data matches expected formats (e.g., UPC-A, EAN-13) and encoding, and stripping or escaping any control characters or executable code. In real-world scenarios, attackers have used malicious barcodes to inject SQL commands or shellcode into POS systems, bypassing network-level defenses.
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 practitioner preparing for the CRISC exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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.
IT Risk Identification — This question tests IT Risk Identification — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy application-layer input validation and sanitization for barcode scanner inputs. — Option D is the most appropriate risk mitigation strategy because the vulnerability is specifically malware injection via unvalidated input from barcode scanners. Application-layer input validation and sanitization directly addresses the root cause by ensuring that only expected, safe data is processed by the POS system, preventing injection attacks at the point of entry.
What should I do if I get this CRISC 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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