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Paused-Based Desync Detection reporting HTTP/2 requests

Thomas | Last updated: Jan 08, 2024 08:22AM UTC

Hello! Burp Scanner's Client-Side desync check will sometimes report a firm status and confirm a paused-based desync vulnearbility. However. the attached requests on the issue, state that the requests are HTTP/2, which is a little confusing. See the below (I cannot give the actual target host I am afraid). I cannot attach images here so I guess text will do? Request 1: POST / HTTP/2 Host: redacted.com User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Accept-Encoding: gzip, deflate, br Connection: keep-alive Content-Length: 332 Content-Type: application/x-www-form-urlencoded Request 2: GET /robots.txt HTTP/2 Host: redacted.com Accept-Encoding: gzip, deflate, br Accept: */* Accept-Language: en-US;q=0.9,en;q=0.8 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.6099.71 Safari/537.36 Connection: keep-alive Cache-Control: max-age=0 GET / HTTP/1.1 Host: redacted.com User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Accept-Encoding: gzip, deflate, br Connection: close This does actually work using turbo intruder and HTTP/1.1. Its just confusing that I get HTTP/2 requests in the issue. Kind regards, Tom

Michelle, PortSwigger Agent | Last updated: Jan 08, 2024 02:57PM UTC