HTTP Request Smuggling

cyphersteve writes "Multiple vendors are vulnerable to a new class of attack named 'HTTP Request Smuggling' that revolves around piggybacking a HTTP request inside of another HTTP request, which could let a remote malicious user conduct cache poisoning, cross-site scripting, session hijacking, as well as bypassing web application firewall protection and other attacks. HTTP Request Smuggling works by taking advantage of the discrepancies in parsing when one or more HTTP devices are between the user and the web server. CERT has ranked this attack and the associated vulnerabilties found in multiple products as High Risk. The authors (Amit Klein, Steve Orrin, Ronen Heled, and Chaim Linhart) have published a whitepaper describing this technique in detail."