Ursa is a cryptographic library for use with blockchains. A weakness in the Hyperledger AnonCreds specification that is not mitigated in the Ursa and AnonCreds implementations is that the Issuer does not publish a key correctness proof demonstrating that a generated private key is sufficient to meet the unlinkability guarantees of AnonCreds. The Ursa and AnonCreds CL-Signatures implementations always generate a sufficient private key. A malicious issuer could in theory create a custom CL Signature implementation (derived from the Ursa or AnonCreds CL-Signatures implementations) that uses weakened private keys such that presentations from holders could be shared by verifiers to the issuer who could determine the holder to which the credential was issued. This vulnerability could impact holders of AnonCreds credentials implemented using the CL-signature scheme in the Ursa and AnonCreds implementations of CL Signatures. The ursa project has has moved to end-of-life status and no fix is expected.
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References
History
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published: 2024-01-16T21:35:31.306Z
Updated: 2024-08-03T07:03:40.258Z
Reserved: 2022-05-18T18:37:25.395Z
Link: CVE-2022-31021
Vulnrichment
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NVD
Status : Modified
Published: 2024-01-16T22:15:37.080
Modified: 2024-11-21T07:03:43.770
Link: CVE-2022-31021
Redhat
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