CVE-2023-25690 — Apache HTTP Server: HTTP request splitting with mod_rewrite and mod_proxy

Affected: Apache Software Foundation Apache HTTP Server

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.

USN-5942-1 — apache2 vulnerabilities

Affected: Ubuntu:18.04:LTS: apache2, Ubuntu:20.04:LTS: apache2, Ubuntu:22.04:LTS: apache2

Lars Krapf discovered that the Apache HTTP Server mod_proxy module incorrectly handled certain configurations. A remote attacker could possibly use this issue to perform an HTTP Request Smuggling attack. (CVE-2023-25690)

Dimas Fariski Setyawan Putra discovered that the Apache HTTP Server mod_proxy_uwsgi module incorrectly handled certain special characters. A remote attacker could possibly use this issue to perform an HTTP Request Smuggling attack. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, and Ubuntu 22.10. (CVE-2023-27522)

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CVE-2023-25690 — Apache HTTP Server: HTTP request splitting with mod_rewrite and mod_proxy

USN-5942-1 — apache2 vulnerabilities