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Implement comprehensive API security testing using the 42Crunch platform to perform static audit and dynamic conformance scanning of OpenAPI specifications.
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Detecting and exploiting HTTP request smuggling vulnerabilities caused by Content-Length and Transfer-Encoding parsing discrepancies between front-end and back-end servers.
Identifying and exploiting OAuth 2.0 and OpenID Connect misconfigurations including redirect URI manipulation, token leakage, and authorization code theft during security assessments.
Identifying and exploiting dangling DNS records pointing to unclaimed cloud services, enabling subdomain takeover for phishing, cookie stealing, and authentication bypass during authorized penetration tests.
SOC 職業分類に基づく
SKILL.md を表示中
| 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"] |
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.
additionalProperties/readOnly gaps: Audit flags these but they must be enforced at runtime (API Protect or backend), not just documented.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.
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:
Security Score Categories:
Running API Audit via VS Code Extension:
Example OpenAPI Definition with Security Controls:
openapi: 3.0.3
info:
title: Secure User API
version: 1.0.0
servers:
- url: https://api.example.com/v1
description: Production server (HTTPS only)
security:
- BearerAuth: []
paths:
/users/{userId}:
get:
operationId: getUserById
summary: Retrieve user by ID
parameters:
- name: userId
in: path
required: true
schema:
type: string
format: uuid
pattern: '^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$'
maxLength: 36
responses:
'200':
description: User details
content:
application/json:
schema:
$ref: '#/components/schemas/User'
'400':
description: Invalid request
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'401':
description: Unauthorized
'404':
description: User not found
components:
securitySchemes:
BearerAuth:
type: http
scheme: bearer
bearerFormat: JWT
schemas:
User:
type: object
required:
- id
- email
properties:
id:
type: string
format: uuid
readOnly: true
email:
type: string
format: email
maxLength: 254
name:
type: string
maxLength: 100
pattern: '^[a-zA-Z\s\-]+$'
additionalProperties: false
Error:
type: object
required:
- code
- message
properties:
code:
type: integer
format: int32
message:
type: string
maxLength: 256
additionalProperties: false
The conformance scan dynamically tests a running API against its OpenAPI contract to detect runtime vulnerabilities including OWASP API Security Top 10 issues:
Scan v2 Configuration:
# 42c-conf.yaml
version: "2.0"
scan:
target:
url: https://api.example.com/v1
authentication:
- type: bearer
token: "${API_TOKEN}"
in: header
name: Authorization
settings:
maxScanTime: 3600
requestsPerSecond: 10
followRedirects: false
tests:
owasp:
- bola
- bfla
- injection
- ssrf
- massAssignment
- excessiveDataExposure
Running Conformance Scan via CLI:
# Install the 42Crunch CLI
npm install -g @42crunch/cicd-cli
# Run conformance scan
42crunch-cli scan \
--api-definition ./openapi.yaml \
--target-url https://api.example.com/v1 \
--token $CRUNCH_TOKEN \
--min-score 70 \
--report-format sarif \
--output scan-report.sarif
GitHub Actions Integration:
name: API Security Testing
on:
push:
paths:
- 'api/**'
- 'openapi/**'
jobs:
api-security:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- name: 42Crunch API Audit
uses: 42Crunch/api-security-audit-action@v3
with:
api-token: ${{ secrets.CRUNCH_API_TOKEN }}
collection-name: "my-api-collection"
min-score: 75
upload-to-code-scanning: true
- name: 42Crunch Conformance Scan
if: github.ref == 'refs/heads/main'
uses: 42Crunch/api-conformance-scan@v1
with:
api-token: ${{ secrets.CRUNCH_API_TOKEN }}
target-url: ${{ secrets.STAGING_API_URL }}
scan-config: ./42c-conf.yaml
Jenkins Pipeline Integration:
pipeline {
agent any
stages {
stage('API Security Audit') {
steps {
script {
def auditResult = sh(
script: '''
42crunch-cli audit \
--api-definition openapi.yaml \
--token ${CRUNCH_TOKEN} \
--min-score 75 \
--report-format json \
--output audit-report.json
''',
returnStatus: true
)
if (auditResult != 0) {
error("API Security Audit failed - score below threshold")
}
}
}
}
stage('Conformance Scan') {
when { branch 'main' }
steps {
sh '''
42crunch-cli scan \
--api-definition openapi.yaml \
--target-url ${STAGING_URL} \
--token ${CRUNCH_TOKEN} \
--scan-config 42c-conf.yaml
'''
}
}
}
post {
always {
archiveArtifacts artifacts: '*-report.*'
publishHTML([
reportDir: '.',
reportFiles: 'audit-report.html',
reportName: 'API Security Report'
])
}
}
}
API Protect deploys as a micro-gateway in front of API endpoints to enforce the OpenAPI contract at runtime:
# api-protect-config.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: api-protect-config
data:
protection-config.json: |
{
"apiDefinition": "/config/openapi.yaml",
"enforcement": {
"validateRequests": true,
"validateResponses": true,
"blockOnFailure": true,
"logLevel": "warn"
},
"rateLimit": {
"enabled": true,
"requestsPerMinute": 100,
"burstSize": 20
},
"allowlist": {
"contentTypes": ["application/json"],
"methods": ["GET", "POST", "PUT", "DELETE"]
}
}
When 42Crunch identifies issues, follow this remediation process:
Common Audit Findings and Fixes:
| Finding | Severity | Fix |
|---|---|---|
| No authentication defined | Critical | Add securitySchemes and security requirements |
| Missing input validation | High | Add type, format, pattern, maxLength constraints |
| Server URL uses HTTP | High | Change server URLs to HTTPS |
| No error responses defined | Medium | Add 4xx and 5xx response definitions |
| additionalProperties not restricted | Medium | Set additionalProperties: false on object schemas |
| Missing rate limiting | Medium | Add x-rateLimit extension or use API Protect |
42Crunch evaluates APIs against these critical security areas: