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- Add scripts/agent.py and references/api-reference.md to all remaining skills - Update all 648 LICENSE files: copyright now reads 'Mahipal' - Add implementing-security-monitoring-with-datadog (new skill with full anatomy) - All 649 skills now have: SKILL.md, LICENSE, scripts/agent.py, references/api-reference.md
60 lines
1.9 KiB
Markdown
60 lines
1.9 KiB
Markdown
# API Reference: Testing for JSON Web Token Vulnerabilities
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## JWT Attack Types
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| Attack | Severity | Description |
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|--------|----------|-------------|
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| alg:none bypass | Critical | Remove signature verification |
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| Weak HMAC secret | Critical | Brute-force signing key |
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| Algorithm confusion | Critical | RS256 -> HS256 with public key |
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| kid injection | High | Path traversal/SQLi in kid |
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| jku spoofing | High | Point JWKS to attacker server |
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| Claim tampering | High | Modify role/sub without re-sign |
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| Missing exp | High | Token never expires |
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## JWT Structure
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| Part | Content | Example |
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|------|---------|---------|
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| Header | Algorithm, type, kid | `{"alg":"HS256","typ":"JWT"}` |
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| Payload | Claims (sub, exp, iat, iss) | `{"sub":"1001","role":"user"}` |
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| Signature | HMAC or RSA signature | Base64url encoded |
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## JWT Testing Tools
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| Tool | Purpose |
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|------|---------|
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| jwt_tool | 12+ attack modes for JWT testing |
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| hashcat -m 16500 | GPU JWT HMAC secret cracking |
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| Burp JWT Editor | Interactive JWT manipulation |
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| jwt.io | Online JWT decoder |
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| john | CPU-based JWT secret cracking |
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## Standard Claims
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| Claim | Required | Purpose |
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|-------|----------|---------|
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| iss | Yes | Issuer identifier |
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| sub | Yes | Subject (user ID) |
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| aud | Yes | Intended audience |
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| exp | Yes | Expiration time |
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| iat | Recommended | Issued at time |
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| nbf | Optional | Not before time |
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| jti | Optional | JWT ID (replay prevention) |
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## Python Libraries
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| Library | Version | Purpose |
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|---------|---------|---------|
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| `base64` | stdlib | JWT encoding/decoding |
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| `hmac` | stdlib | HMAC signature generation |
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| `hashlib` | stdlib | Hash functions |
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| `json` | stdlib | JSON parsing |
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| `requests` | >=2.28 | Token testing against APIs |
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## References
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- jwt_tool: https://github.com/ticarpi/jwt_tool
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- PortSwigger JWT: https://portswigger.net/web-security/jwt
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- RFC 7519: https://www.rfc-editor.org/rfc/rfc7519
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