CVE-2022-31021

2024-01-1622:15:37

CWE-829

[email protected]

web.nvd.nist.gov

ursa

cryptographic library

vulnerability

anoncreds

blockchain

hyperledger

cl-signatures

key correctness proof

cve-2022-31021

5.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

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

5.2 Medium

AI Score

Confidence

High

0.0005 Low

EPSS

Percentile

17.1%

JSON

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.

Affected configurations

Vulners

NVD

Node

hyperledgerursaRange≤0.3.7

VendorProductVersionCPE
hyperledgerursa*cpe:2.3:a:hyperledger:ursa:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
hyperledger	ursa	*	cpe:2.3:a:hyperledger:ursa::::::::

CNA Affected

[
  {
    "vendor": "hyperledger",
    "product": "ursa",
    "versions": [
      {
        "version": "<= 0.3.7",
        "status": "affected"
      }
    ]
  }
]