Software Composition Analysis (SCA)

SCA tools inventory dependencies and match them against vulnerability databases like CVE and NVD.

Why SCA matters

• Modern applications use 80-90% open-source code.
• One vulnerable library affects all applications using it.
• Log4Shell (CVE-2021-44228) demonstrated supply chain risk.
• License compliance requirements in regulated industries.

What SCA analyzes

• Package manager manifests (package.json, requirements.txt, pom.xml).
• Lock files for exact version detection.
• Container images and base image layers.
• Binary artifacts and compiled dependencies.

Popular SCA tools

• Commercial: Snyk, Sonatype Nexus, Black Duck, Mend (WhiteSource).
• Open source: OWASP Dependency-Check, Trivy, Grype.

CI/CD integration

• Scan on every build.
• Block deployments with critical vulnerabilities.
• Auto-create pull requests for updates (Dependabot, Renovate).
• Generate SBOM (Software Bill of Materials).

Remediation strategies

1. Upgrade: Update to patched version.
2. Patch: Apply security patch if upgrade not possible.
3. Mitigate: Implement compensating controls.
4. Replace: Switch to alternative library.
5. Accept: Document risk for low-impact findings.

Best practices

• Establish vulnerability SLAs (critical: 24h, high: 7d).
• Monitor for new CVEs in production dependencies.
• Audit transitive (indirect) dependencies.
• Maintain SBOM for incident response.