BEA Systems WebLogic 8.1 SP1 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 WebLogic 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.\