CVE-2023-25690

Name	CVE-2023-25690
Description	Some mod_proxy configurations on Apache HTTP Server versions 2.4.0 through 2.4.55 allow a HTTP Request Smuggling attack. Configurations are affected when mod_proxy is enabled along with some form of RewriteRule or ProxyPassMatch in which a non-specific pattern matches some portion of the user-supplied request-target (URL) data and is then re-inserted into the proxied request-target using variable substitution. For example, something like: RewriteEngine on RewriteRule "^/here/(.*)" "http://example.com:8080/elsewhere?$1"; [P] ProxyPassReverse /here/ http://example.com:8080/ Request splitting/smuggling could result in bypass of access controls in the proxy server, proxying unintended URLs to existing origin servers, and cache poisoning. Users are recommended to update to at least version 2.4.56 of Apache HTTP Server.
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-3401-1, DSA-5376-1
Debian Bugs	1032476

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
apache2 (PTS)	buster	2.4.38-3+deb10u8	vulnerable
	buster (security)	2.4.38-3+deb10u10	fixed
	bullseye	2.4.56-1~deb11u2	fixed
	bullseye (security)	2.4.59-1~deb11u1	fixed
	bookworm	2.4.57-2	fixed
	bookworm (security)	2.4.59-1~deb12u1	fixed
	trixie	2.4.58-1	fixed
	sid	2.4.59-1	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
apache2	source	buster	2.4.38-3+deb10u10	DLA-3401-1
apache2	source	bullseye	2.4.56-1~deb11u1	DSA-5376-1
apache2	source	(unstable)	2.4.56-1		1032476

Notes

https://www.openwall.com/lists/oss-security/2023/03/07/1
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2023-25690
https://github.com/apache/httpd/commit/d78a166fedd9d02c23e4b71d5f53bd9b2c4b9a51 (r1908095)