CVE-2023-23931

Name	CVE-2023-23931
Description	cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In affected versions `Cipher.update_into` would accept Python objects which implement the buffer protocol, but provide only immutable buffers. This would allow immutable objects (such as `bytes`) to be mutated, thus violating fundamental rules of Python and resulting in corrupted output. This now correctly raises an exception. This issue has been present since `update_into` was originally introduced in cryptography 1.8.
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-3331-1, DLA-3331-2, DLA-3922-1
Debian Bugs	1031049

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
python-cryptography (PTS)	bullseye	3.3.2-1	vulnerable
	bullseye (security)	3.3.2-1+deb11u1	fixed
	bookworm	38.0.4-3+deb12u1	fixed
	bookworm (security)	38.0.4-3~deb12u1	vulnerable
	sid, trixie	43.0.0-1	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
python-cryptography	source	buster	2.6.1-3+deb10u4	DLA-3331-2
python-cryptography	source	bullseye	3.3.2-1+deb11u1	DLA-3922-1
python-cryptography	source	(unstable)	38.0.4-3		1031049

Notes

https://github.com/pyca/cryptography/security/advisories/GHSA-w7pp-m8wf-vj6r
https://github.com/pyca/cryptography/commit/9fbf84efc861668755ab645530ec7be9cf3c6696