| name | implementing-api-security-testing-with-42crunch |
| description | Implement comprehensive API security testing using the 42Crunch platform to perform static audit and dynamic conformance scanning of OpenAPI specifications. |
| domain | cybersecurity |
| subdomain | api-security |
| tags | ["api-security","42crunch","openapi","api-audit","api-scan","conformance-testing","shift-left","ci-cd-security","owasp-api-top-10"] |
| version | 1.0 |
| author | mahipal |
| license | Apache-2.0 |
| nist_csf | ["PR.PS-01","ID.RA-01","PR.DS-10","DE.CM-01"] |
Implementing API Security Testing with 42Crunch
Overview
42Crunch is an API security platform that combines Shift-Left security testing with Shield-Right runtime protection. It provides API Audit for static security analysis of OpenAPI definitions, API Conformance Scan for dynamic vulnerability detection, and API Protect for real-time threat prevention. The platform integrates into CI/CD pipelines and IDEs to identify OWASP API Security Top 10 vulnerabilities before and after deployment.
When to Use
- When deploying or configuring implementing api security testing with 42crunch capabilities in your environment
- When establishing security controls aligned to compliance requirements
- When building or improving security architecture for this domain
- When conducting security assessments that require this implementation
Common Misconfigurations & Verification
- Audit score without a dynamic scan: a high static audit score on the OAS says nothing about the running API - always pair Audit with a Conformance Scan against a live target.
- Spec does not equal implementation: the deployed API may expose endpoints/fields absent from the audited spec; scan the real instance and reconcile.
additionalProperties/readOnly gaps: Audit flags these but they must be enforced at runtime (API Protect or backend), not just documented.- CI gate that doesn't fail the build: a min-score set too low or an ignored exit code lets regressions merge.
- Auth misconfigured for the scan: a scan running unauthenticated reports a false "clean" - supply valid tokens in
42c-conf.yaml.
How to verify it works: run Audit and confirm it flags missing auth/constraints; run the Conformance Scan against staging with valid auth and confirm OWASP checks (BOLA/BFLA/injection) execute; intentionally break the spec (remove a constraint) and confirm the CI min-score gate fails the build; diff scanned endpoints against the OAS to catch undocumented routes.
Prerequisites
- 42Crunch platform account (free tier available for evaluation)
- OpenAPI Specification (OAS) v2.0, v3.0, or v3.1 definitions for target APIs
- IDE with 42Crunch extension (VS Code, IntelliJ, or Eclipse)
- CI/CD pipeline (Jenkins, GitHub Actions, Azure DevOps, or GitLab CI)
- Running API instance for dynamic scanning (conformance scan)
- Node.js or Python environment for CLI tooling
Core Concepts
API Audit (Static Analysis)
API Audit performs static security analysis of OpenAPI definitions without requiring a running API. It evaluates the specification against 300+ security checks organized into categories:
