Description
Sim before 0.8.14 classifies tool requests as internal based on URL prefix matching without scheme normalization, skipping SSRF validation and minting internal authentication tokens. Authenticated workflow authors can bypass external URL validation by supplying paths starting with /api/ in HTTP blocks to reach internal-only endpoints like POST /api/function/execute.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| simstudioai | sim | < 0.8.14 | 0.8.14 |
References
- Researcher write-up technical-description
- isInternalRoute prefix check and addInternalAuthIfNeeded technical-description
- checkInternalAuth accepts the minted internal JWT technical-description
- refactor(tools): execute internal operations in process (#7179) patch issue-tracking
- https://github.com/simstudioai/sim product
- VulnCheck Advisory: Sim before 0.8.14 Confused Deputy in Tool URL Routing Mints an Internal Token for a User-Supplied /api/ Path third-party-advisory