[POC] HTTP Request Smuggling | Bug Bounty POC | TE.CL vulnerabilities | CL.TE vulnerabilities

HTTP request smuggling is a technique for interfering with the way a web site processes sequences of HTTP requests that are received from one or more users. Request smuggling vulnerabilities are often critical in nature, allowing an attacker to bypass security controls, gain unauthorized access to sensitive data, and directly compromise other application users. Today's web applications frequently employ chains of HTTP servers between users and the ultimate application logic. Users send requests to a front-end server (sometimes called a load balancer or reverse proxy) and this server forwards requests to one or more back-end servers. This type of architecture is increasingly common, and in some cases unavoidable, in modern cloud-based applications.

When the front-end server forwards HTTP requests to a back-end server, it typically sends several requests over the same back-end network connection, because this is much more efficient and performant. The protocol is very simple: HTTP requests are sent one after another, and the receiving server parses the HTTP request headers to determine where one request ends and the next one begins:

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https://portswigger.net/web-security/request-smuggling https://portswigger.net/web-security/request-smuggling/finding https://blog.detectify.com/2020/05/28/hiding-in-plain-sight-http-request-smuggling/ ... https://www.youtube.com/watch?v=Nv2Eu_ZLU3o