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The trick is to use a vertical tab (<code>%09</code>) and then place another URL in the tag. So once a victim clicks the link on the error page, she will go somewhere else. As you can see, the browser changes the destination from relative / to an absolute url https://enoflag.de. The exploit is <code>http://domain.tld/%09//otherdomain.tld Here's the httpd configuration to reproduce the behavior: </code><code> <Location /> ProxyPass http://127.0.0.1:9000/ connectiontimeout=1 timeout=2 ProxyPassReverse http://127.0.0.1:9000/ Order allow,deny Allow from all </Location> </code><code> |