GHSA-753J-MPMX-QQ6G Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') in tornado

Summary When Tornado receives a request with two Transfer-Encoding: chunked headers, it ignores them both. This enables request smuggling when Tornado is deployed behind a proxy server that emits such requests. Pound does this. PoC 0. Install Tornado. 1. Start a simple Tornado server that echoes...