CVE-2024-21670

CL-Signatures Revocation Scheme in Ursa has flaws that allow a holder to demonstrate non-revocation of a revoked credential

Description

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 A verifier may verify a credential from a holder as being "not revoked" when in fact, the holder's credential has been revoked.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

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.09%
Vendor Advisory github.com
Affected: hyperledger-archives ursa
Published at:
Updated at:

References

Link Tags
https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2024-21670?
CVE-2024-21670 has been scored as a medium severity vulnerability.
How to fix CVE-2024-21670?
To fix CVE-2024-21670, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2024-21670 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2024-21670 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-21670?
CVE-2024-21670 affects hyperledger-archives ursa.
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