REQUEST SMUGGLING 2025

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The document discusses HTTP Request Smuggling (HRS), a web attack technique that exploits discrepancies in how different HTTP devices parse requests. It details the potential damages caused by HRS, including web cache poisoning, session hijacking, and evasion of security measures like firewalls. The paper provides examples of various HRS techniques and their implications, as well as recommendations for protecting against such attacks. It emphasizes the need for consistent and strict HTTP parsing across all devices to mitigate risks.

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What is an example of smuggling?

Smuggling is the illegal transporting of goods. These goods can be legal, such as alcohol and tobacco, or illegal, such as drugs and arms. Illegal trafficking of immigrants is also a form of smuggling.

What is a HTTP request smuggling attack?

HTTP request smuggling is a web application attack that takes advantage of inconsistencies in how front-end servers (proxies) and back-end servers process requests from more than one sender.

What is the impact of HTTP request smuggling vulnerability?

The term HTTP request smuggling (HRS) refers to techniques that interfere with the way in which a website processes sequences of HTTP requests. Request smuggling vulnerabilities are considered critical because they allow threat actors to bypass security controls.

What is the difference between HTTP response splitting and request smuggling?

HTTP Splitting (CAPEC-105 and CAPEC-34) is different from HTTP Smuggling due to the fact that during implementation of asynchronous requests, HTTP Splitting requires the embedding/injection of arbitrary HTML headers and content through user input into browser cookies or Ajax web/browser object parameters like

Who discovered HTTP request smuggling?

HTTP request smuggling (HRS) is a security exploit on the HTTP protocol that takes advantage of an inconsistency between the interpretation of Content-Length and Transfer-Encoding headers between HTTP server implementations in an HTTP proxy server chain. It was first documented in 2005 by Linhart et al.