Vulnerability Details : CVE-2022-31021
Potential exploit
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.
Vulnerability category: File inclusion
Products affected by CVE-2022-31021
- cpe:2.3:a:hyperledger:ursa:*:*:*:*:*:rust:*:*
Exploit prediction scoring system (EPSS) score for CVE-2022-31021
0.05%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 24 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2022-31021
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
5.3
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
3.9
|
1.4
|
NIST | 2024-01-24 |
3.3
|
LOW | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N |
1.8
|
1.4
|
GitHub, Inc. | 2024-01-16 |
CWE ids for CVE-2022-31021
-
The product imports, requires, or includes executable functionality (such as a library) from a source that is outside of the intended control sphere.Assigned by: security-advisories@github.com (Primary)
References for CVE-2022-31021
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https://www.brics.dk/RS/98/29/BRICS-RS-98-29.pdf
Exploit;Third Party Advisory
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https://github.com/hyperledger/ursa/security/advisories/GHSA-2q6j-gqc4-4gw3
Breaking unlinkability in CL Signatures by colluding Issuers and Verifiers using malicious keys · Advisory · hyperledger-archives/ursa · GitHubVendor Advisory
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