CVE-2023-49288

Name	CVE-2023-49288
Description	Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Affected versions of squid are subject to a a Use-After-Free bug which can lead to a Denial of Service attack via collapsed forwarding. All versions of Squid from 3.5 up to and including 5.9 configured with "collapsed_forwarding on" are vulnerable. Configurations with "collapsed_forwarding off" or without a "collapsed_forwarding" directive are not vulnerable. This bug is fixed by Squid version 6.0.1. Users are advised to upgrade. Users unable to upgrade should remove all collapsed_forwarding lines from their squid.conf.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
squid (PTS)	buster	4.6-1+deb10u7	vulnerable
	buster (security)	4.6-1+deb10u10	vulnerable
	bullseye	4.13-10+deb11u2	vulnerable
	bullseye (security)	4.13-10+deb11u3	vulnerable
	bookworm	5.7-2	vulnerable
	bookworm (security)	5.7-2+deb12u1	vulnerable
	trixie	6.6-1	fixed
	sid	6.9-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
squid	source	(unstable)	6.1-1
squid3	source	(unstable)	(unfixed)

Notes

https://github.com/squid-cache/squid/security/advisories/GHSA-rj5h-46j6-q2g5
https://megamansec.github.io/Squid-Security-Audit/trace-uaf.html
https://github.com/squid-cache/squid/pull/1127 possibly removed the vulnerable code.