Description
Tencent BrowserSkill through 0.4.2 contains a missing authentication vulnerability that allows local attackers to impersonate the bsk daemon because remoteSocket() connects to the loopback WebSocket without credentials or peer verification. Attackers who bind the daemon port before it starts or after it exits receive the extension's full tool surface, including evaluate, to run JavaScript through CDP in logged-in browser tabs.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Tencent | BrowserSkill | ≤ 0.4.2 | — |
References
- GitHub Issue #402 issue-tracking
- https://github.com/Tencent/BrowserSkill product
- https://github.com/Tencent/BrowserSkill/blob/ext-v0.4.2/apps/extension/src/transport/remote-endpoint.ts#L79-L85 technical-description
- https://github.com/Tencent/BrowserSkill/commit/7e862a44d19d0c1e492901fe29562cc7d79af590 patch
- VulnCheck Advisory: Tencent BrowserSkill through 0.4.2 Missing Authentication in Local WebSocket Transport third-party-advisory