biscuit-rust vulnerable to public key confusion in third party block
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Privilege escalation
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-269.
Summary
biscuit-rust is the Rust implementation of Biscuit, an authentication and authorization token for microservices architectures. Third-party blocks can be generated without transferring the whole token to the third-party authority. Instead, a ThirdPartyBlock request can be sent, providing only the necessary info to generate a third-party block and to sign it, which includes the public key of the previous block (used in the signature) and the public keys part of the token symbol table (for public key interning in datalog expressions). A third-part block request forged by a malicious user can trick the third-party authority into generating datalog trusting the wrong keypair.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| biscuit-auth | biscuit-rust | before 5.0.0 | 5.0.0 | Patch available | CNA |
| — | biscuit-auth (crates.io) | 4.0.0 to before 5.0.0 | 5.0.0 | Patch available | GHSA-p9w4-585h-g3c7 |
- biscuit-rust Vendorbiscuit-auth Affected before 5.0.0 Fixed in 5.0.0 Patch available CNA
- biscuit-auth (crates.io) Vendor— Affected 4.0.0 to before 5.0.0 Fixed in 5.0.0 Patch available GHSA-p9w4-585h-g3c7
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:biscuitsec:biscuit-auth:*:*:*:*:*:rust:*:* | before 5.0.0 | Vulnerable | biscuit-auth |
- cpe:2.3:a:biscuitsec:biscuit-auth:*:*:*:*:*:rust:*:* Versions before 5.0.0 Vulnerable ·biscuit-auth
Remediation
- Fix · CNA biscuit-rust (biscuit-auth) Fixed in 5.0.0
- Fix · GHSA-p9w4-585h-g3c7 biscuit-auth (crates.io) Fixed in 5.0.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2024-41949
- 2026-10-03 Alias added: GHSA-p9w4-585h-g3c7
References
More Biscuit-auth vulnerabilities
- TI-2022-13098 Signature forgery in Biscuit CVSS 3.1CRITICAL 9.8
Sources
- CVE-2024-41949 · CVE Program
- CVE-2024-41949 · NVD
- FIRST EPSS
- GHSA-p9w4-585h-g3c7 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences