CVE-2024-21670: CL-Signatures Revocation Scheme in Ursa has flaws that allow a holder to demonstrate non-revocation of a revoked credential

January 16, 2024 (updated January 19, 2024)

The revocation schema that is part of the Ursa CL-Signatures implementations has a flaw that could impact the privacy guarantees defined by the AnonCreds verifiable credential model, allowing a malicious holder of a revoked credential to generate a valid Non-Revocation Proof for that credential as part of an AnonCreds presentation.

References

github.com/advisories/GHSA-r78f-4q2q-hvv4
github.com/hyperledger-archives/ursa
github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4
nvd.nist.gov/vuln/detail/CVE-2024-21670

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