CVE-2022-39955

Name	CVE-2022-39955
Description	The OWASP ModSecurity Core Rule Set (CRS) is affected by a partial rule set bypass by submitting a specially crafted HTTP Content-Type header field that indicates multiple character encoding schemes. A vulnerable back-end can potentially be exploited by declaring multiple Content-Type "charset" names and therefore bypassing the configurable CRS Content-Type header "charset" allow list. An encoded payload can bypass CRS detection this way and may then be decoded by the backend. The legacy CRS versions 3.0.x and 3.1.x are affected, as well as the currently supported versions 3.2.1 and 3.3.2. Integrators and users are advised to upgrade to 3.2.2 and 3.3.3 respectively.
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-3293-1, ELA-783-1
Debian Bugs	1021137

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
modsecurity-crs (PTS)	jessie	2.2.9-1+deb8u1	vulnerable
	stretch (lts), stretch	3.2.3-0+deb9u1	fixed
	buster	3.1.0-1+deb10u2	vulnerable
	buster (security)	3.2.3-0+deb10u3	fixed
	bullseye	3.3.0-1+deb11u1	vulnerable
	bookworm	3.3.4-1	fixed
	sid, trixie	3.3.5-2	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
modsecurity-crs	source	jessie	(unfixed)	end-of-life
modsecurity-crs	source	stretch	3.2.3-0+deb9u1		ELA-783-1
modsecurity-crs	source	buster	3.2.3-0+deb10u3		DLA-3293-1
modsecurity-crs	source	(unstable)	3.3.4-1			1021137

Notes

[bullseye] - modsecurity-crs <no-dsa> (Minor issues; will be fixed in point release)
https://coreruleset.org/20220919/crs-version-3-3-3-and-3-2-2-covering-several-cves/