CVE-2014-0050

MultipartStream.java en Apache Commons FileUpload anterior a 1.3.1, utilizado en Apache Tomcat, JBoss Web y otros productos, permite a atacantes remotos causar una denegación de servicio (bucle infinito y consumo de CPU) a través de una cabecera Content-Type manipulada que evade las condiciones de salida del bucle.

A denial of service flaw was found in the way Apache Commons FileUpload, which is embedded in Tomcat and JBoss Web, handled small-sized buffers used by MultipartStream. A remote attacker could use this flaw to create a malformed Content-Type header for a multipart request, causing Tomcat to enter an infinite loop when processing such an incoming request.

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.