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API Reference: Testing API for Broken Object Level Authorization
BOLA Test Types
| Test | Method | Severity |
|---|---|---|
| Horizontal read | GET victim's resource with attacker token | High |
| Horizontal write | PATCH/PUT victim's resource | Critical |
| Horizontal delete | DELETE victim's resource | Critical |
| ID enumeration | Sequential/predictable ID access | High |
| Method bypass | Different HTTP methods on same resource | High |
| Batch request | Include victim IDs in batch endpoint | High |
| Nested resource | Access child via parent swap | High |
Object ID Types
| Type | Example | Predictability |
|---|---|---|
| Sequential integer | /orders/1042 |
High |
| UUID v4 | /orders/550e8400-... |
Low |
| Encoded/base64 | /orders/MTAwMg== |
Medium |
| Composite | /users/42/orders/1042 |
High |
| Slug | /profiles/john-doe |
Medium |
OWASP API1:2023 Checks
| Check | Description |
|---|---|
| Per-object authorization | Every object access checks ownership |
| Data-layer enforcement | WHERE user_id = authenticated_user.id |
| Rate limiting | Slow enumeration attempts |
| UUID over sequential | Reduce predictability |
| Batch endpoint auth | Validate all IDs in arrays |
Automated Tools
| Tool | Purpose |
|---|---|
| Autorize (Burp) | Automated BOLA detection |
| OWASP ZAP Access Control | Authorization boundary testing |
| ffuf | ID enumeration at scale |
| Postman | Manual BOLA testing |
Python Libraries
| Library | Version | Purpose |
|---|---|---|
requests |
>=2.28 | HTTP API calls |
json |
stdlib | Response parsing |
References
- OWASP API Security: https://owasp.org/API-Security/editions/2023/en/0xa1-broken-object-level-authorization/
- Autorize: https://github.com/Quitten/Autorize