CVE-2023-22795

Name	CVE-2023-22795
Description	A regular expression based DoS vulnerability in Action Dispatch <6.1.7.1 and <7.0.4.1 related to the If-None-Match header. A specially crafted HTTP If-None-Match header can cause the regular expression engine to enter a state of catastrophic backtracking, when on a version of Ruby below 3.2.0. This can cause the process to use large amounts of CPU and memory, leading to a possible DoS vulnerability All users running an affected release should either upgrade or use one of the workarounds immediately.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DSA-5372-1
Debian Bugs	1030050

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
rails (PTS)	bullseye, bullseye (security)	2:6.0.3.7+dfsg-2+deb11u2	fixed
	bookworm	2:6.1.7.3+dfsg-2~deb12u1	fixed
	trixie	2:6.1.7.3+dfsg-6	fixed
	sid	2:6.1.7.3+dfsg-7	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
rails	source	bullseye	2:6.0.3.7+dfsg-2+deb11u1		DSA-5372-1
rails	source	(unstable)	2:6.1.7.3+dfsg-1			1030050

Notes

https://discuss.rubyonrails.org/t/cve-2023-22795-possible-redos-based-dos-vulnerability-in-action-dispatch/82118
https://github.com/rails/rails/commit/484fc9185db6c6a6a49ab458b11f9366da02bab2 (6-1-stable)