HTTP/2 Request Smuggling — TryHackMe Walkthrough

🔥 Master HTTP/2 Request Smuggling & Bypass Web Security Like a Pro | Complete TryHackMe Tutorial Learn how attackers exploit HTTP/2 downgrade vulnerabilities to smuggle malicious requests, hijack user sessions, and poison web caches — even when the protocol was designed to be "hack-proof"! In this in-depth tutorial on HTTP/2 Request Smuggling, you'll discover: **HTTP/2 vs HTTP/1.1**: Key protocol differences and why binary formatting matters [**H2.CL](http://H2.CL) & H2.TE Desync Attacks**: How content-length manipulation breaks backend connections **CRLF Injection**: Smuggling headers to bypass frontend proxies and WAFs **Request Tunneling**: Accessing restricted admin panels and internal resources **Web Cache Poisoning**: Injecting malicious JavaScript payloads via catch poisoning **H2C Smuggling**: Exploiting clear-text HTTP/2 upgrades to tunnel requests **Real-World Labs**: Hands-on exploitation using Burp Suite, HAProxy, and custom tools ⏱️ *Timestamps* 00:00 Introduction 01:15 HTTP/2 Explained 06:56 HTTP/2 Desync 13:45 CRLF Injection 16:17 Practical Example 22:25 HTTP/2 Request Tunneling 23:34 HTTP/2 Request Tunneling: Leaking Internal Headers 37:40 Bypassing front end restrictions 42:52 HTTP/2 Request Tunneling: Web Cache Poisoning 54:33 h2c Smuggling 🔗 *Resources & Further Reading* TryHackMe HTTP/2 Request Smuggling Room: https://tryhackme.com/room/http2reque... H2C Smuggling Tool (Bishop Fox): https://github.com/BishopFox/h2csmuggler Full TryHackMe Web App Pentesting Playlist:    • TryHackMe - Web App Pentesting   💡 *Don't forget to LIKE this video, SUBSCRIBE for weekly cybersecurity tutorials, and COMMENT with questions or topics you want covered next!* #HTTP2 #RequestSmuggling #WebSecurity #EthicalHacking #TryHackMe #BurpSuite #PenTesting #InfoSec