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Collaborator: What are the exploitability differences between DNS lookups from different headers?

Michael | Last updated: Nov 25, 2017 12:11AM UTC

Looking at the scan logs from Collaborator, I'm seeing medium severity for DNS lookups when the URL is supplied in either X-Forwarded-For or X-Wap-Profile, but red when it's caused by the Host header. I'm trying to understand why they are of different severity. In both instances, the server is performing a DNS request. Is it because the Host header isn't meant to be changed, so the server might be thinking it's an internal host rather than a client IP? Even then, I don't see how it can be exploited any differently.

PortSwigger Agent | Last updated: Nov 27, 2017 09:21AM UTC