Vulnerability Description
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.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Hyperledger | Ursa | < 0.3 |
Related Weaknesses (CWE)
References
- https://github.com/hyperledger/ursa/security/advisories/GHSA-2q6j-gqc4-4gw3Vendor Advisory
- https://www.brics.dk/RS/98/29/BRICS-RS-98-29.pdfExploitThird Party Advisory
- https://github.com/hyperledger/ursa/security/advisories/GHSA-2q6j-gqc4-4gw3Vendor Advisory
- https://www.brics.dk/RS/98/29/BRICS-RS-98-29.pdfExploitThird Party Advisory
FAQ
What is CVE-2022-31021?
CVE-2022-31021 is a vulnerability with a CVSS score of 3.3 (LOW). 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 ...
How severe is CVE-2022-31021?
CVE-2022-31021 has been rated LOW with a CVSS base score of 3.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-31021?
Check the references section above for vendor advisories and patch information. Affected products include: Hyperledger Ursa.