OverTheWire - Bandit 19 Walkthrough
OverTheWire – Bandit (https://overthewire.org/wargames/bandit/)
OverTheWire host’s a variety of Capture the Flag (CTF) challenges that range in difficulty. Bandit, one of the stages offered, is a wargame that is aimed at absolute beginners. It will teach the basics needed to be able to play other wargames.
Description:
To gain access to the next level, you should use the setuid binary in the homedirectory. Execute it without arguments to find out how to use it. The password for this level can be found in the usual place (/etc/bandit_pass), after you have used the setuid binary.