CVE-2023-37464

Name	CVE-2023-37464
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).
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-3515-1, DSA-5472-1
Debian Bugs	1041423

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
cjose (PTS)	buster	0.6.1+dfsg1-1	vulnerable
	buster (security)	0.6.1+dfsg1-1+deb10u1	fixed
	bullseye (security), bullseye	0.6.1+dfsg1-1+deb11u1	fixed
	bookworm, bookworm (security)	0.6.2.1-1+deb12u1	fixed
	sid, trixie	0.6.2.3-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin	Debian Bugs
cjose	source	buster	0.6.1+dfsg1-1+deb10u1	DLA-3515-1
cjose	source	bullseye	0.6.1+dfsg1-1+deb11u1	DSA-5472-1
cjose	source	bookworm	0.6.2.1-1+deb12u1	DSA-5472-1
cjose	source	(unstable)	0.6.2.2-1		1041423

Notes

https://github.com/OpenIDC/cjose/security/advisories/GHSA-3rhg-3gf2-6xgj
https://github.com/OpenIDC/cjose/commit/7325e9a5e71e2fc0e350487ecac7d84acdf0ed5e (v0.6.2.2)