CVE-2013-5705

apache2/modsecurity.c en ModSecurity anterior a 2.7.6 permite a atacantes remotos evadir reglas mediante el uso de codificación de transferencia fragmentada con un valor convertido a mayúsculas fragmentado en la cabecera HTTP Transfer-Encoding.

Martin Holst Swende discovered a flaw in the way chunked requests are handled in ModSecurity, an Apache module whose purpose is to tighten the Web application security. A remote attacker could use this flaw to bypass intended mod_security restrictions by using chunked transfer coding with a capitalized Chunked value in the Transfer-Encoding HTTP header, allowing to send requests containing content that should have been removed by mod_security.