CVE-2022-31053: Signature forgery in Biscuit

June 17, 2022 (updated March 7, 2023)

The paper Cryptanalysis of Aggregate Γ-Signature and Practical Countermeasures in Application to Bitcoin defines a way to forge valid Γ-signatures, an algorithm that is used in the Biscuit specification version 1. It would allow an attacker to create a token with any access level.

As Biscuit v1 was still an early version and not broadly deployed, we were able to contact all known users of Biscuit v1 and help them migrate to Biscuit v2. We are not aware of any active exploitation of this vulnerability.

References

eprint.iacr.org/2020/1484
github.com/advisories/GHSA-75rw-34q6-72cr
github.com/biscuit-auth/biscuit
github.com/biscuit-auth/biscuit/security/advisories/GHSA-75rw-34q6-72cr
nvd.nist.gov/vuln/detail/CVE-2022-31053
pkg.go.dev/vuln/GO-2022-0564

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