request-smuggling

You can detect HTTP request smuggling by probing your target server to identify CL.TE, TE.CL, TE.TE, H2.CL, H2.TE, CL.0, and client-side desynchronization vulnerabilities. This analysis assesses security risks in communication between front-end proxies, CDNs, load balancers, and origin servers.

HTTP request smuggling is a desynchronization vulnerability where mismatched HTTP/1.1 framing between front-end proxies and origin servers allows attackers to smuggle requests. It exploits discrepancies in Content-Length and Transfer-Encoding headers to bypass security controls.

Yes, detecting HTTP request smuggling requires familiarity with raw HTTP/1.1 framing and reverse-proxy topologies. Understanding how front-end proxies, CDNs, and load balancers parse headers is essential for identifying CL.TE, TE.CL, and H2.CL desynchronization issues.

After detecting HTTP request smuggling vulnerabilities, you should implement recommended mitigation strategies to prevent exploitation. These strategies secure the communication channels between your front-end proxies, CDNs, load balancers, and origin servers against desynchronization attacks.

Testing for CL.0 and client-side desynchronization vulnerabilities is limited by the complexity of reverse-proxy topologies and specific HTTP/1.1 framing implementations. Accurate detection depends on how your front-end proxies, CDNs, and load balancers handle conflicting Content-Length and Transfer-Encoding headers.

The best way to test for H2.CL and H2.TE smuggling is to execute a targeted probe against your server, analyzing how HTTP/2 front-end proxies interact with HTTP/1.1 origin servers. This identifies desynchronization vulnerabilities arising from protocol downgrades and header translation.