CVE-2023-37464
Therefore this bug allows an attacker to provide a truncated Authentication Tag and to modify the JWE accordingly.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.71%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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).
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 0.71% probability · 52th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-327
- Affected
- cisco/cjose
- Source
- security-advisories@github.com
References
- https://datatracker.ietf.org/doc/html/rfc7518#section-4.7Third Party Advisory
- https://github.com/OpenIDC/cjose/commit/7325e9a5e71e2fc0e350487ecac7d84acdf0ed5ePatch
- https://github.com/OpenIDC/cjose/releases/tag/v0.6.2.2Release Notes
- https://github.com/OpenIDC/cjose/security/advisories/GHSA-3rhg-3gf2-6xgjExploit, Patch, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2023/08/msg00002.html
- 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/LCQJXKDPCWCXB2V4JMQ3UWYJ4UIBPUW6/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PTZHOVGY7AHGNMEY245HK4Q36AMA53AL/
- https://www.debian.org/security/2023/dsa-5472
- https://datatracker.ietf.org/doc/html/rfc7518#section-4.7Third Party Advisory
- https://github.com/OpenIDC/cjose/commit/7325e9a5e71e2fc0e350487ecac7d84acdf0ed5ePatch
- https://github.com/OpenIDC/cjose/releases/tag/v0.6.2.2Release Notes
- https://github.com/OpenIDC/cjose/security/advisories/GHSA-3rhg-3gf2-6xgjExploit, Patch, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2023/08/msg00002.html
- 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/LCQJXKDPCWCXB2V4JMQ3UWYJ4UIBPUW6/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PTZHOVGY7AHGNMEY245HK4Q36AMA53AL/
- https://www.debian.org/security/2023/dsa-5472
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.