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Burps builtin Logger logs at the wrong location

floyd | Last updated: Jun 22, 2022 07:19AM UTC

Hi there, Author of https://www.pentagrid.ch/en/blog/teaching_burp_a_new_http_transport_encoding/ here. Have you read that blog post? Please have a look at the Diagram at https://www.pentagrid.ch/images/202204_burp_handling_of_messages.png . I think Burp's builtin Logger logs requests perfectly fine (how they are sent to the server). However, I don't think it is logging the responses correctly. Logger logs the responses before they are edited by extensions in the processProxyMessage. That means you'll see responses in a in-between state and not what is *really* received by the browser. Is this working as intended? I think it would be way more intuitive if we see what the server and browser receive in the logger. Btw. the Logger++ extension does this correctly. I was thinking about this again because you say Logger++ has a "high" performance impact and therefore I'd like to replace it with the builtin Logger in some cases. But in the current state I can't rely on the builtin Logger.

Hannah, PortSwigger Agent | Last updated: Jun 23, 2022 02:19PM UTC