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Date: Tue, 07 Mar 2023 12:55:07 +0000
From: Eric Covener <>
Subject: CVE-2023-25690: Apache HTTP Server: HTTP request splitting with
 mod_rewrite and mod_proxy 

Severity: important


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/(.*)" "$1" ; [P]
ProxyPassReverse /here/ 

Request splitting/smuggling could result in bypass of access controls in the proxy server, proxying unintended URLs to existing origin servers, and cache poisoning.


Lars Krapf of Adobe (finder)



2023-02-02: reported

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