CKS Supply Chain Security Practice Question
You are auditing your cluster's supply chain security. You need to generate a Software Bill of Materials (SBOM) for a container image. Which tool should you use?
⚠ Common exam trap
Candidates often confuse vulnerability scanning (Trivy) with SBOM generation (Syft), leading them to choose Trivy because it is more widely known, even though Syft is the dedicated tool for producing a Software Bill of Materials.
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
✓
Syft
Syft is a CLI tool specifically designed to generate a Software Bill of Materials (SBOM) from container images and filesystems. It uses a pluggable cataloger engine to extract package metadata (e.g., dpkg, RPM, APK, Python, Java) and outputs the SBOM in standard formats like CycloneDX or SPDX, directly addressing the requirement for supply chain security auditing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Trivy
Why it's wrong here
Trivy is primarily a vulnerability scanner, not an SBOM generator. However, it can generate SBOMs in some versions, but the primary tool for SBOM generation is Syft.
- ✗
Kubesec
Why it's wrong here
Kubesec performs static risk analysis of Kubernetes manifests, scoring security contexts and resource settings; it never inspects image layers, so it cannot enumerate packages. It is the correct tool when hardening YAML before deployment, not when producing a component inventory from a container image.
- ✗
Checkov
Why it's wrong here
Checkov scans infrastructure-as-code templates such as Terraform and Kubernetes manifests for misconfigurations; it does not unpack image layers to list installed packages. It would be correct for policy checks on IaC in CI, but generating an SBOM requires a scanner that reads image contents directly.
- ✓
Syft
Why this is correct
Syft is an SBOM generation tool that inspects container image layers and outputs a package inventory in SPDX or CycloneDX formats. It directly satisfies the supply chain audit requirement to produce a Software Bill of Materials, unlike scanners such as Trivy or Grype, which report vulnerabilities rather than catalogue components.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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