CVE-2022-31053
The Biscuit specification version 1 contains a vulnerable algorithm that allows malicious actors to forge valid Γ-signatures.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.01%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Biscuit is an authentication and authorization token for microservices architectures. The Biscuit specification version 1 contains a vulnerable algorithm that allows malicious actors to forge valid Γ-signatures. Such an attack would allow an attacker to create a token with any access level. The version 2 of the specification mandates a different algorithm than gamma signatures and as such is not affected by this vulnerability. The Biscuit implementations in Rust, Haskell, Go, Java and Javascript all have published versions following the v2 specification. There are no known workarounds for this issue.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.01% probability · 61th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-347
- Affected
- biscuitsec/biscuit-auth · biscuitsec/biscuit-go · biscuitsec/biscuit-haskell · clever-cloud/biscuit-java
- Source
- security-advisories@github.com
References
- https://eprint.iacr.org/2020/1484Exploit, Technical Description, Third Party Advisory
- https://github.com/biscuit-auth/biscuit/security/advisories/GHSA-75rw-34q6-72crExploit, Third Party Advisory
- https://eprint.iacr.org/2020/1484Exploit, Technical Description, Third Party Advisory
- https://github.com/biscuit-auth/biscuit/security/advisories/GHSA-75rw-34q6-72crExploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.