{"id":"CVE-2024-21670","summary":"CL-Signatures Revocation Scheme in Ursa has flaws that allow a holder to demonstrate non-revocation of a revoked credential","details":"Ursa is a cryptographic library for use with blockchains. 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. A verifier may verify a credential from a holder as being \"not revoked\" when in fact, the holder's credential has been revoked. Ursa has moved to end-of-life status and no fix is expected.","aliases":["GHSA-r78f-4q2q-hvv4"],"modified":"2026-08-12T03:51:35.311118988Z","published":"2024-01-16T21:44:05.572Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/21xxx/CVE-2024-21670.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-327"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/21xxx/CVE-2024-21670.json"},{"type":"ADVISORY","url":"https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-21670"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/hyperledger-archives/ursa","events":[{"introduced":"28e9f632793bedb566efb5527d43b55aa904bafa"},{"last_affected":"34ef3926b633a5eaff5b220c40005bbc8cd04861"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"0.3.7"},{"introduced":"0.1.0"},{"last_affected":"0.1.0"}],"source":["AFFECTED_FIELD","CPE_STRING"],"cpe":"cpe:2.3:a:hyperledger:ursa:0.1.0:*:*:*:*:rust:*:*"}}],"versions":["0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-21670.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N"}]}