Jakarta Tomcat 5.0.19 (Coyote/1.1) and Tomcat 4.1.24 (Coyote/1.0) allows remote attackers to poison the web cache, bypass web application firewall protection, and conduct XSS attacks via an HTTP request with both a "Transfer-Encoding: chunked" header and a Content-Length header, which causes Tomcat to incorrectly handle and forward the body of the request in a way that causes the receiving server to process it as a separate HTTP request, aka "HTTP Request Smuggling."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10499
http://www.watchfire.com/resources/HTTP-Request-Smuggling.pdf
http://www.vupen.com/english/advisories/2009/0233
http://www.vupen.com/english/advisories/2008/1979/references
http://www.vupen.com/english/advisories/2008/0065
http://www.vupen.com/english/advisories/2007/3386
http://www.vupen.com/english/advisories/2007/3087
http://www.vupen.com/english/advisories/2007/2732
http://www.securityfocus.com/bid/25159
http://www.securityfocus.com/bid/13873
http://www.securityfocus.com/archive/1/500412/100/0/threaded
http://www.securityfocus.com/archive/1/500396/100/0/threaded
http://www.securityfocus.com/archive/1/485938/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2008-0261.html
http://www.redhat.com/support/errata/RHSA-2007-0360.html
http://www.redhat.com/support/errata/RHSA-2007-0327.html
http://www.fujitsu.com/global/support/software/security/products-f/interstage-200703e.html
http://tomcat.apache.org/security-6.html
http://tomcat.apache.org/security-5.html
http://tomcat.apache.org/security-4.html
http://support.avaya.com/elmodocs2/security/ASA-2007-206.htm
http://securitytracker.com/id?1014365
http://secunia.com/advisories/33668
http://secunia.com/advisories/30908
http://secunia.com/advisories/30899
http://secunia.com/advisories/29242
http://secunia.com/advisories/28365
http://secunia.com/advisories/27037
http://secunia.com/advisories/26660
http://secunia.com/advisories/26235
http://seclists.org/lists/bugtraq/2005/Jun/0025.html
http://lists.vmware.com/pipermail/security-announce/2008/000003.html
http://lists.opensuse.org/opensuse-security-announce/2008-03/msg00001.html
http://lists.apple.com/archives/security-announce//2007/Jul/msg00004.html