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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
90 lines
2.3 KiB
Markdown
90 lines
2.3 KiB
Markdown
# API Reference: Broken Function Level Authorization (BFLA)
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## OWASP API5:2023 — Broken Function Level Authorization
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### Description
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API endpoints expose functions that should be restricted to specific roles.
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Low-privileged users can invoke admin-level functionality.
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### Common Patterns
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| Pattern | Example |
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|---------|---------|
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| Guessable admin paths | `/api/admin/users` |
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| Method switching | POST allowed but PUT bypasses auth |
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| Role parameter manipulation | `{"role": "admin"}` in request |
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| Vertical privilege escalation | User accessing admin endpoints |
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## Testing Methodology
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### Step 1: Discover Endpoints
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```bash
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# From OpenAPI spec
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curl https://api.target.com/swagger.json | jq '.paths | keys'
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# From JavaScript source
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grep -oP '["'"'"']/api/[^"'"'"']+' app.js
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```
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### Step 2: Test with Low-Priv Token
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```bash
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curl -H "Authorization: Bearer <low_priv_token>" \
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https://api.target.com/api/admin/users
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```
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### Step 3: Test HTTP Method Switching
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```bash
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# If GET returns 403, try POST/PUT/DELETE
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curl -X PUT -H "Authorization: Bearer <low_priv_token>" \
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https://api.target.com/api/admin/users/1
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```
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## Python requests Library
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### Request with Token
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```python
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headers = {"Authorization": f"Bearer {token}"}
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resp = requests.get(url, headers=headers, timeout=10, verify=False)
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```
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### Method Switching
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```python
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for method in ["GET", "POST", "PUT", "DELETE", "PATCH"]:
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resp = requests.request(method, url, headers=headers, timeout=10)
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if resp.status_code < 400:
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print(f"Accessible via {method}: {resp.status_code}")
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```
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## Common Admin Endpoints to Test
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```
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/admin
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/api/admin
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/api/v1/admin/users
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/api/internal
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/manage
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/api/config
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/api/debug
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/api/users/all
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/api/system/settings
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/graphql (with admin mutations)
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```
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## Burp Suite — Authorization Testing
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### Autorize Extension
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1. Install Autorize from BApp Store
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2. Set low-privilege cookie/token
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3. Browse application as admin
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4. Autorize replays requests with low-priv token
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5. Compare responses for authorization bypass
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## Response Analysis
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| Indicator | Meaning |
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|-----------|---------|
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| 200 with data | Full access (vulnerability) |
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| 200 empty body | Possible partial bypass |
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| 403 Forbidden | Properly restricted |
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| 401 Unauthorized | Auth required |
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| 405 Method Not Allowed | Method restricted |
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