Fixed in Apache Tomcat 5.5.23, 5.0.SVN

Important: Information disclosure CVE-2005-2090

Requests with multiple content-length headers should be rejected as invalid. When multiple components (firewalls, caches, proxies and Tomcat) process a sequence of requests where one or more requests contain multiple content-length headers and several components do not reject the request and make different decisions as to which content-length header to use an attacker can poison a web-cache, perform an XSS attack and obtain sensitive information from requests other then their own. Tomcat now returns 400 for requests with multiple content-length headers.

Affects: 5.0.0-5.0.30, 5.5.0-5.5.22