CVE-2009-1891

El módulo mod_deflate en Apache httpd v2.2.11 y anteriores comprime archivos de gran tamaño hasta finalizar incluso después de que la conexión de red asociada está cerrada, lo cual permite a atacantes remotos provocar una denegación de servicio (consumo de CPU).

The previous update caused a regression for apache2 in Debian 4.0 "etch". Using mod_deflate together with mod_php could cause segfaults when a client aborts a connection. This update corrects this flaw. A denial of service flaw was found in the Apache mod_proxy module when it was used as a reverse proxy. A remote attacker could use this flaw to force a proxy process to consume large amounts of CPU time. This issue did not affect Debian 4.0 "etch". A denial of service flaw was found in the Apache mod_deflate module. This module continued to compress large files until compression was complete, even if the network connection that requested the content was closed before compression completed. This would cause mod_deflate to consume large amounts of CPU if mod_deflate was enabled for a large file. A similar flaw related to HEAD requests for compressed content was also fixed.