CVE-2011-3368

El módulo mod_proxy del servidor HTTP Apache 1.3.x hasta la versión 1.3.42, 2.0.x hasta la 2.0.64 y 2.2.x hasta la 2.2.21 no interactúa apropiadamente con el uso de coincidencias de patrones de (1) RewriteRule y (2) ProxyPassMatch para la configuración de proxys inversos, lo que permite a atacantes remotos enviar peticiones a servidores de intranet a través de URIs malformadas que contengan un carácter inicial @ (arroba).

The Apache HTTP Server is a popular web server. It was discovered that the Apache HTTP Server did not properly validate the request URI for proxied requests. In certain configurations, if a reverse proxy used the ProxyPassMatch directive, or if it used the RewriteRule directive with the proxy flag, a remote attacker could make the proxy connect to an arbitrary server, possibly disclosing sensitive information from internal web servers not directly accessible to the attacker. It was discovered that mod_proxy_ajp incorrectly returned an "Internal Server Error" response when processing certain malformed HTTP requests, which caused the back-end server to be marked as failed in configurations where mod_proxy was used in load balancer mode. A remote attacker could cause mod_proxy to not send requests to back-end AJP servers for the retry timeout period or until all back-end servers were marked as failed.