Natas Level 4 → Level 5
Logging into natas4, we immediately shown an error.
This error tells us we need to access to site as natas5.
With the error that the main page gave us, this can easily be done by using Burp Suite to intercept the request and modify the Referer header to http://natas5.natas.labs.overthewire.org.
Doing this tells the web page where we are visiting from.
Forwarding the request in Burp Suite, we get the password for the next level.