CVE-2013-4286

Apache Tomcat anterior a 6.0.39, 7.x anterior a 7.0.47 y 8.x anterior a 8.0.0-RC3, cuando se utiliza un conector HTTP o AJP, no maneja debidamente ciertas cabeceras de solicitud HTTP inconsistentes, lo que permite a atacantes remotos provocar una identificación incorrecta de la longitud de una solicitud y realizar ataques request-smuggling a través de (1) múltiples cabeceras de Content-Length o (2) una cabecera de Content-Length y una cabecera de "Transfer-Encoding: chunked". NOTA: esta vulnerabilidad existe debido a una solución incompleta para CVE-2005-2090.

It was found that when Tomcat / JBoss Web processed a series of HTTP requests in which at least one request contained either multiple content-length headers, or one content-length header with a chunked transfer-encoding header, Tomcat / JBoss Web would incorrectly handle the request. A remote attacker could use this flaw to poison a web cache, perform cross-site scripting (XSS) attacks, or obtain sensitive information from other requests.

Apache Tomcat is a servlet container for the Java Servlet and JavaServer Pages technologies. It was found that when Tomcat processed a series of HTTP requests in which at least one request contained either multiple content-length headers, or one content-length header with a chunked transfer-encoding header, Tomcat would incorrectly handle the request. A remote attacker could use this flaw to poison a web cache, perform cross-site scripting attacks, or obtain sensitive information from other requests. It was discovered that the fix for CVE-2012-3544 did not properly resolve a denial of service flaw in the way Tomcat processed chunk extensions and trailing headers in chunked requests. A remote attacker could use this flaw to send an excessively long request that, when processed by Tomcat, could consume network bandwidth, CPU, and memory on the Tomcat server. Note that chunked transfer encoding is enabled by default.