Florianbuetow Claude Code Misconfig

Security Misconfiguration Analysis

Analyze application and infrastructure configuration for security misconfigurations that could expose the system to attack. Covers missing security headers, debug modes left enabled, overly permissive CORS, default credentials, verbose error handling, unnecessary features, and directory listing.

Supported Flags

Read ../../shared/schemas/flags.md for full flag documentation. This skill supports all cross-cutting flags.

Key flags for this skill:

Framework Context

OWASP Top 10 2021 -- A05: Security Misconfiguration

Security misconfiguration is the most commonly seen issue. This is commonly a result of insecure default configurations, incomplete or ad hoc configurations, open cloud storage, misconfigured HTTP headers, unnecessary HTTP methods, permissive CORS, and verbose error messages containing sensitive information.

CWE Mappings:

• CWE-16: Configuration
• CWE-2: Environment
• CWE-388: Error Handling
• CWE-497: Exposure of System Data to an Unauthorized Control Sphere
• CWE-611: Improper Restriction of XML External Entity Reference
• CWE-614: Sensitive Cookie in HTTPS Session Without 'Secure' Attribute
• CWE-756: Missing Custom Error Page
• CWE-942: Permissive Cross-domain Policy with Untrusted Domains

STRIDE Mapping: All categories -- misconfigurations can enable spoofing, tampering, information disclosure, denial of service, and elevation of privilege.

Detection Patterns

Read references/detection-patterns.md before running analysis. It contains Grep regex patterns, language-specific examples, scanner coverage, and false positive guidance for each detection category.

Workflow

Step 1 -- Determine Scope

1. Parse --scope flag (default: changed).
2. Resolve to a concrete file list.
3. Filter to configuration-relevant files:
   • Application config: *.yaml, *.yml, *.toml, *.ini, *.cfg, *.conf, *.json, *.properties, *.env, *.env.*
   • Server config: nginx.conf, httpd.conf, apache2.conf, Caddyfile, traefik.yml
   • Framework config: settings.py, config/*.rb, application.properties, next.config.*, nuxt.config.*
   • IaC: *.tf, *.hcl, Dockerfile, docker-compose*.yml, *.k8s.yml, k8s/*.yaml
   • CI/CD: .github/workflows/*.yml, .gitlab-ci.yml, Jenkinsfile, .circleci/config.yml
   • Source files that set headers or configure middleware
4. Also include source files that import/configure security middleware or set HTTP headers.

Step 2 -- Check for Scanners

Detect available scanners in priority order:

If no scanners are found, proceed with Claude analysis only and note this in output.

Step 3 -- Run Available Scanners

For each detected scanner, run against the scoped files:

• checkov: checkov -d <target> -o json --quiet
• tfsec: tfsec <target> --format json
• kics: kics scan -p <target> --type json
• trivy: trivy fs --format json --scanners misconfig <target>
• semgrep: semgrep scan --config auto --json --quiet <target>

Normalize scanner output to the findings schema per ../../shared/schemas/scanners.md.

Step 4 -- Claude Analysis

Using Grep and Read, search for patterns from references/detection-patterns.md. For each match:

1. Read surrounding context (10-20 lines) to determine if the pattern is a true finding.
2. Check for compensating controls (e.g., a reverse proxy may set headers upstream).
3. Determine if the configuration is for production or development.
4. Assign severity based on the criteria in detection-patterns.md.
5. Avoid duplicating scanner findings -- deduplicate by file and line.

Step 5 -- Report Findings

Output findings using the schema from ../../shared/schemas/findings.md.

Use the MSCFG prefix for finding IDs (e.g., MSCFG-001, MSCFG-002).

What to Look For

1. Debug mode enabled in production -- DEBUG=True, NODE_ENV=development, FLASK_DEBUG=1, RAILS_ENV=development in production-bound configs.
2. Missing security headers -- No Content-Security-Policy, X-Frame-Options, Strict-Transport-Security, X-Content-Type-Options, Permissions-Policy, or Referrer-Policy in HTTP responses.
3. CORS wildcard or overly permissive origins -- Access-Control-Allow-Origin: * or reflecting arbitrary Origin headers without validation.
4. Default credentials -- Unchanged admin/admin, root/root, or well-known default passwords in configuration files.
5. Verbose error handling -- Stack traces, internal paths, database details, or framework version numbers exposed to end users in error responses.
6. Unnecessary features enabled -- Directory listing, HTTP TRACE/TRACK methods, admin panels exposed without authentication, phpinfo() pages.
7. Insecure cookie attributes -- Missing Secure, HttpOnly, or SameSite flags on session or authentication cookies.
8. Permissive file permissions -- World-readable secrets, 777 permissions on sensitive directories, overly broad IAM policies.
9. TLS/SSL misconfiguration -- Weak cipher suites, outdated TLS versions (< 1.2), self-signed certificates in production, missing HSTS.
10. Missing rate limiting -- No rate limiting on authentication endpoints, API routes, or form submissions.

Scanner Integration

See ../../shared/schemas/scanners.md for full scanner invocation details. This skill primarily uses:

When scanners are unavailable, Claude falls back to Grep-based detection using the patterns in references/detection-patterns.md and reports findings with confidence: medium.

Output Format

All findings use the schema defined in ../../shared/schemas/findings.md.

ID Prefix: MSCFG (e.g., MSCFG-001)

References for each finding:

• references.owasp: A05:2021
• references.cwe: Appropriate CWE from the list above
• references.stride: Relevant STRIDE category
• metadata.tool: misconfig
• metadata.framework: owasp
• metadata.category: A05

Summary table after all findings:

| Severity | Count |
|----------|-------|
| CRITICAL | N     |
| HIGH     | N     |
| MEDIUM   | N     |
| LOW      | N     |

Followed by top 3 priorities and an overall assessment paragraph.

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