How's your OS escalation skills? How about your binary exploitation? See if you can reach the final user (ETSCTF)

On each user you successfully escalate, there will be a flag on its home directory. This flag can also be used as a password to directly switch to that user (eg with su - opportunity) at a later time so that you dont have to go through all the steps every time you re-connect.

To start the challenge connect with nc -t 10.0.40.14 1337, or telnet 10.0.40.14 1337. Your timer starts from the first time you connect to the service.