CVE-2024-21670

2024-01-1622:15:45

CWE-327

[email protected]

web.nvd.nist.gov

ursa

cryptographic library

blockchain

revocation schema

privacy guarantees

anoncreds

verifiable credential

flaw

non-revocation proof

presentation

verifier

end-of-life

8.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

6.9 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

39.1%

JSON

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 A verifier may verify a credential from a holder as being “not revoked” when in fact, the holder’s credential has been revoked.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.