CVE-2023-37464

Public Exploit
Incorrect Authentication Tag length usage in AES GCM decryption in OpenIDC/cjose

Description

OpenIDC/cjose is a C library implementing the Javascript Object Signing and Encryption (JOSE). The AES GCM decryption routine incorrectly uses the Tag length from the actual Authentication Tag provided in the JWE. The spec says that a fixed length of 16 octets must be applied. Therefore this bug allows an attacker to provide a truncated Authentication Tag and to modify the JWE accordingly. Users should upgrade to a version >= 0.6.2.2. Users unable to upgrade should avoid using AES GCM encryption and replace it with another encryption algorithm (e.g. AES CBC).

Category

8.6
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.31%
Vendor Advisory github.com
Affected: OpenIDC cjose
Published at:
Updated at:

References

Link Tags
https://github.com/OpenIDC/cjose/security/advisories/GHSA-3rhg-3gf2-6xgj patch vendor advisory exploit
https://github.com/OpenIDC/cjose/commit/7325e9a5e71e2fc0e350487ecac7d84acdf0ed5e patch
https://datatracker.ietf.org/doc/html/rfc7518#section-4.7 third party advisory
https://github.com/OpenIDC/cjose/releases/tag/v0.6.2.2 release notes
https://lists.debian.org/debian-lts-announce/2023/08/msg00002.html
https://www.debian.org/security/2023/dsa-5472
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DFWAPMYYVBO2U65HPYDTBEKNSXG4TP5C/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PTZHOVGY7AHGNMEY245HK4Q36AMA53AL/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LCQJXKDPCWCXB2V4JMQ3UWYJ4UIBPUW6/

Frequently Asked Questions

What is the severity of CVE-2023-37464?
CVE-2023-37464 has been scored as a high severity vulnerability.
How to fix CVE-2023-37464?
To fix CVE-2023-37464, 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-2023-37464 being actively exploited in the wild?
It is possible that CVE-2023-37464 is being exploited or will be exploited in a near future based on public information. 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-2023-37464?
CVE-2023-37464 affects OpenIDC cjose.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.