Broken or risky cryptographic algorithm in hyperledger-archives ursa
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-327.
Summary
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 A verifier may verify a credential from a holder as being "not revoked" when in fact, the holder's credential has been revoked.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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| hyperledger-archives | ursa | up to 0.3.7 | — | No fix listed | CNA |
| — | ursa (crates.io) | up to 0.3.7 | — | No fix listed | GHSA-r78f-4q2q-hvv4 |
| — | anoncreds-clsignatures (crates.io) | all versions | — | No fix listed | GHSA-r78f-4q2q-hvv4 |
- ursa Vendorhyperledger-archives Affected up to 0.3.7 Fixed in — No fix listed CNA
- ursa (crates.io) Vendor— Affected up to 0.3.7 Fixed in — No fix listed GHSA-r78f-4q2q-hvv4
- anoncreds-clsignatures (crates.io) Vendor— Affected all versions Fixed in — No fix listed GHSA-r78f-4q2q-hvv4
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:hyperledger:ursa:0.1.0:*:*:*:*:rust:*:* | 0.1.0 | Vulnerable | hyperledger |
- cpe:2.3:a:hyperledger:ursa:0.1.0:*:*:*:*:rust:*:* Versions 0.1.0 Vulnerable ·hyperledger
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2024-21670
- 2026-10-03 Alias added: GHSA-r78f-4q2q-hvv4
References
More hyperledger Ursa vulnerabilities
- TI-2022-13066 Unlinkability broken in ursa when verifiers use malicious keys CVSS 3.1MEDIUM 5.3
- TI-2024-14785 Ursa CL-Signatures Revocation allows verifiers to generate unique identifiers for holders CVSS 3.1MEDIUM 6.5
Sources
- CVE-2024-21670 · CVE Program
- CVE-2024-21670 · NVD
- FIRST EPSS
- GHSA-r78f-4q2q-hvv4 · GitHub Advisory Database · CC BY 4.0
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