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CVE-2022-31021— Unlinkability broken in ursa when verifiers use malicious keys

Quick assessment

Affected
hyperledger ursa
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Hyperledger Ursa是Hyperledger开源的一个与区块链一起使用的密码库。 Hyperledger Ursa 0.3之前版本存在安全漏洞，该漏洞源于缺乏对CL签名颁发者密钥正确性的检查。

CVSS 3.3 · Low EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1556 · Modify Authentication Process
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I. Basic Information for CVE-2022-31021

Vulnerability Information
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Vulnerability Title
Unlinkability broken in ursa when verifiers use malicious keys
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
从非可信控制范围包含功能例程
Source: CVE Program / CVE List V5
Vulnerability Title
Hyperledger Ursa 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hyperledger Ursa是Hyperledger开源的一个与区块链一起使用的密码库。 Hyperledger Ursa 0.3之前版本存在安全漏洞，该漏洞源于缺乏对CL签名颁发者密钥正确性的检查。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
hyperledger ursa <= 0.3.7 -

II. Public POCs for CVE-2022-31021

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III. Intelligence Information for CVE-2022-31021

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Vendor Advisories for CVE-2022-31021 (1)

Other References for CVE-2022-31021 (1)

IV. Related Vulnerabilities

Same product: ursa
Same vendor: hyperledger
Same weakness: CWE-829

V. Comments for CVE-2022-31021

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