{"id":"CVE-2024-21670","state":"PUBLISHED","title":"CL-Signatures Revocation Scheme in Ursa has flaws that allow a holder to demonstrate non-revocation of a revoked credential","description":"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 A verifier may verify a credential from a holder as being \"not revoked\" when in fact, the holder's credential has been revoked.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.","publishedAt":"2024-01-16T21:44:05.572Z","updatedAt":"2024-08-01T22:27:35.720Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["hyperledger-archives ursa"],"affected":[{"vendor":"hyperledger-archives","product":"ursa","versions":[{"version":"<= 0.3.7","status":"affected"}]}],"references":["https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4"],"weaknesses":["CWE-327"],"ingestedAt":"2026-10-29T20:06:59.846Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/21xxx/CVE-2024-21670.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2024-21670","state":"PUBLISHED","datePublished":"2024-01-16T21:44:05.572Z","dateUpdated":"2024-08-01T22:27:35.720Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2023-12-29T16:10:20.368Z"},"containers":{"cna":{"title":"CL-Signatures Revocation Scheme in Ursa has flaws that allow a holder to demonstrate non-revocation of a revoked credential","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"hyperledger-archives","product":"ursa","versions":[{"version":"<= 0.3.7","status":"affected"}]}],"references":[{"url":"https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4","name":"https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"PHYSICAL","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-327","lang":"en","description":"CWE-327: Use of a Broken or Risky Cryptographic Algorithm","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2024-01-16T21:44:05.572Z"},"source":{"advisory":"GHSA-r78f-4q2q-hvv4","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","affected":[{"vendor":"hyperledger","product":"ursa","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThanOrEqual":"0.3.7","versionType":"custom"}],"cpes":["cpe:2.3:a:hyperledger:ursa:*:*:*:*:*:*:*:*"]}],"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2024-21670","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2024-05-20T20:46:39.280934Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-06-04T17:37:45.919Z"}},{"title":"CVE Program Container","references":[{"url":"https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4","name":"https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4","tags":["x_refsource_CONFIRM","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-01T22:27:35.720Z"}}]}}}