CVE-2022-31021
"Ursa AnonCreds CL-Signatures Unlinkability Weakness"
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.
INFO
Published Date :
Jan. 16, 2024, 10:15 p.m.
Last Modified :
Jan. 24, 2024, 4:46 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
1.4
Exploitability Score :
3.9
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2022-31021.
| URL | Resource |
|---|---|
| https://github.com/hyperledger/ursa/security/advisories/GHSA-2q6j-gqc4-4gw3 | Vendor Advisory |
| https://www.brics.dk/RS/98/29/BRICS-RS-98-29.pdf | Exploit Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2022-31021 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2022-31021 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Jan. 24, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Changed Reference Type https://github.com/hyperledger/ursa/security/advisories/GHSA-2q6j-gqc4-4gw3 No Types Assigned https://github.com/hyperledger/ursa/security/advisories/GHSA-2q6j-gqc4-4gw3 Vendor Advisory Changed Reference Type https://www.brics.dk/RS/98/29/BRICS-RS-98-29.pdf No Types Assigned https://www.brics.dk/RS/98/29/BRICS-RS-98-29.pdf Exploit, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:hyperledger:ursa:*:*:*:*:*:rust:*:* versions up to (excluding) 0.3 -
CVE Received by [email protected]
Jan. 16, 2024
Action Type Old Value New Value Added 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. Added Reference GitHub, Inc. https://github.com/hyperledger/ursa/security/advisories/GHSA-2q6j-gqc4-4gw3 [No types assigned] Added Reference GitHub, Inc. https://www.brics.dk/RS/98/29/BRICS-RS-98-29.pdf [No types assigned] Added CWE GitHub, Inc. CWE-829 Added CVSS V3.1 GitHub, Inc. AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2022-31021 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2022-31021
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.05 }} 0.00%
score
0.13790
percentile