EXtravagant Writeup

Solved By : nigamelastic

The challenge mentions the following:

The flag is in /var/www

on accessing the website we see a normal interface with xml parsing as a service

from the mentioning of XML it seems that this might be an XXE

Since we already know the location of the flag I used the following payload:

I simply uploaded it to the trial tab:

and then used view XML tab to view my xml

This would give flag