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 A verifier may verify a credential from a holder as being "not revoked" when in fact, the holder's credential has been revoked.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.
History

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2024-01-16T21:44:05.572Z

Updated: 2024-08-01T22:27:35.720Z

Reserved: 2023-12-29T16:10:20.368Z

Link: CVE-2024-21670

cve-icon Vulnrichment

Updated: 2024-08-01T22:27:35.720Z

cve-icon NVD

Status : Analyzed

Published: 2024-01-16T22:15:45.810

Modified: 2024-01-24T18:14:10.497

Link: CVE-2024-21670

cve-icon Redhat

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