CAS-004 Secure container scanning script Practice Question
This CAS-004 practice question tests your understanding of scripting, containers and automation. 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 security analyst is writing a script to scan container images for known vulnerabilities before deployment. Which of the following best practices should the analyst implement to ensure the script runs securely?
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
✓
Use parameterized queries or input sanitization for any user-supplied data
Option B is correct because input sanitization and parameterized queries prevent injection attacks when the script processes user-supplied data, such as image names or tags. In the context of container scanning, unsanitized input could lead to command injection or SQL injection if the script queries a vulnerability database. This aligns with secure coding practices for automation scripts, ensuring that the script does not inadvertently execute malicious commands or expose sensitive data.
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.
✗
Hardcode API keys into the script for simplicity
Why it's wrong here
Hardcoding credentials is a major security risk; they can be exposed in version control.
✗
Run the script with root privileges to ensure it has access to all images
Why it's wrong here
Running with least privilege is a security best practice; root access increases the attack surface.
✗
Store credentials in a world-readable configuration file
Why it's wrong here
Credentials should be stored securely (e.g., vault, environment variables), not world-readable.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The CAS-004 exam frequently reuses these exact scenarios with slightly different constraints.
✓Use parameterized queries or input sanitization for any user-supplied dataCorrect answer▾✗Hardcode API keys into the script for simplicityWrong answer — click to see why▾
Why this is wrong here
Hardcoding credentials is a major security risk; they can be exposed in version control.
✗Run the script with root privileges to ensure it has access to all imagesWrong answer — click to see why▾
Why this is wrong here
Running with least privilege is a security best practice; root access increases the attack surface.
✗Store credentials in a world-readable configuration fileWrong answer — click to see why▾
Why this is wrong here
Credentials should be stored securely (e.g., vault, environment variables), not world-readable.
Analysis generated from the official CAS-004blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the principle of least privilege and secure credential handling in automation contexts, and the trap here is that candidates may choose root privileges (Option C) thinking it ensures full access to all images, overlooking the security risk of excessive permissions.
Detailed technical explanation
How to think about this question
Parameterized queries separate SQL logic from data, preventing attackers from injecting malicious SQL via user input; in scripting languages like Python, this is achieved using libraries such as `sqlite3` with placeholders (`?` or `%s`). For command-line tools like `docker scan`, input sanitization might involve validating image names against a regex pattern (e.g., `^[a-z0-9]+(?:[._-][a-z0-9]+)*$`) to avoid shell injection. A real-world scenario is a CI/CD pipeline where a user-supplied image tag like `latest; rm -rf /` could cause catastrophic damage if not sanitized.
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 junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
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.
Scripting, Containers and Automation — This question tests Scripting, Containers and Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use parameterized queries or input sanitization for any user-supplied data — Option B is correct because input sanitization and parameterized queries prevent injection attacks when the script processes user-supplied data, such as image names or tags. In the context of container scanning, unsanitized input could lead to command injection or SQL injection if the script queries a vulnerability database. This aligns with secure coding practices for automation scripts, ensuring that the script does not inadvertently execute malicious commands or expose sensitive data.
What should I do if I get this CAS-004 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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