ISC2 Certified Secure Software Lifecycle Professional (CSSLP) Practice Question

During a CI/CD pipeline, developers execute automated functional tests against a containerized REST service. They want a vulnerability scanner that watches live HTTP traffic and instruments the code to correlate requests with exact lines where flaws occur, avoiding offline source scans. Which automated technique fulfills these needs?

Dynamic application security testing (DAST)
Runtime application self-protection (RASP)
Static application security testing (SAST)
Interactive application security testing (IAST)

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Answer Description

Interactive application security testing (IAST) inserts an agent or instrumentation inside the running application and monitors real HTTP requests generated by functional or integration tests. Because the agent can observe both the request data and the internal execution flow, it can map a vulnerability to the specific file, method, and line of code in real time. Dynamic application security testing (DAST) is limited to observing external behavior and lacks code-level context. Static application security testing (SAST) analyzes source or byte code at rest rather than during execution. Runtime application self-protection (RASP) focuses on blocking attacks in production rather than systematically cataloging vulnerabilities during testing. Therefore, IAST best satisfies the stated requirements.

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What is the key advantage of Interactive Application Security Testing (IAST) over Dynamic Application Security Testing (DAST)?

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How does IAST differ from Static Application Security Testing (SAST)?

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What type of testing is Runtime Application Self-Protection (RASP) designed for, and why doesn’t it fit in CI/CD pipelines?

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How does Interactive Application Security Testing (IAST) work in real-time?

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How is IAST different from Dynamic Application Security Testing (DAST)?

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How does IAST compare to Static Application Security Testing (SAST)?

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ISC2 Certified Secure Software Lifecycle Professional (CSSLP)

Secure Software Testing

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