Improper Verification of Cryptographic Signature Affecting ursa package, versions >=0.0.0


Severity

Recommended
0.0
low
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.05% (19th percentile)

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  • Snyk IDSNYK-RUST-URSA-6164730
  • published17 Jan 2024
  • disclosed16 Jan 2024
  • creditUnknown

Introduced: 16 Jan 2024

CVE-2022-31021  (opens in a new tab)
CWE-347  (opens in a new tab)
First added by Snyk

How to fix?

Upgrade ursa to version or higher.

Overview

Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature due to the lack of prime strength checking in the `CL Signatures Issuer Key Correctness Proofa. An attacker can undermine the unlinkability guarantees of AnonCreds by using a maliciously generated private key that does not meet the required strength, allowing the attacker to potentially link credential presentations to individual holders. This is only exploitable if the issuer generates a private key that does not conform to the safe prime requirements and if verifiers collude with the issuer.

Workaround

This vulnerability can be mitigated by issuers providing a key correctness proof that demonstrates the generation of a sufficiently strong private key, as outlined in the referenced academic paper.

References

CVSS Scores

version 3.1