Binding Burp to a privileged port
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Sometimes it is useful to run an intercepting proxy (running non-root user) on a privileged port. On debian-based systems it is possible using authbind facility.
The first step is to record the necessary port number in authbind config:
$ sudo touch /etc/authbind/byport/443
$ sudo chown abb:abb /etc/authbind/byport/443
$ sudo chmod 755 /etc/authbind/byport/443
After that, run Burp with authbind to let it use privileged port configured above: