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CL.TE request smuggling works when front-end and back-end disagree on where your request ends. The attacker hides a second request in the body of the first. Here's a demo 👇 Practice with PortSwigger's Web Security Academy.

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Web Security Academy

144,361 subscribers

17,824 просмотров • 2 месяцев назад •via X (Twitter)

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Комментарии: 3

Фото профиля RabiX Security
RabiX Security2 месяцев назад

A good reminder that web security isn't only about writing secure code—it's also about understanding how every component processes requests.

Фото профиля Sara Blu
Sara Blu2 месяцев назад

Solid demo. CL.TE gets overlooked in telecom security audits but with layered proxy setups in 5G cores, it's critical we test for this.

Фото профиля Steve | Tech Savvy
Steve | Tech Savvy2 месяцев назад

Web security starts where protocol assumptions break. If your proxy and origin server disagree on request boundaries, attackers will gladly take advantage. Great demo.

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HTTP Request Smuggling Lab Walkthrough: Confirming a CL.TE vulnerability via differential responses. How to identify CLTE Vulnerabilities: 1. Send request to repeater 2. Downgrade protocol to HTTP/1.1 3. Disable "Update Content-Length" 4. Set Content-Length to 6 5. Add "Transfer-Encoding: chunked" heading 6. Send a chunk with an invalid chunk size If the backend times out, this indicates a potential CLTE vulnerability. Confirm the vulnerability with differential responses: 7. Create and send the attack request: - Replace previous chunk with a terminating chunk. - Add a smuggled request after the chunked body. - Append X-ignore: X (without a newline) and send. 8. Send a normal request to repeater, downgrade to HTTP/1.1 and send immediately after the attack request. If the response to the normal request is 404 instead of 200, the backend was poisoned! 🤮 Well done! To learn more about HTTP Request Smuggling and take on this lab yourself, head over the the Web Security Academy now #requestsmuggling #pentesting #bugbounty #hacking #cybersecurity
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