HackTheBox - Luanne walkthrough
Luanne is the Easy level OpenBSD machine.Basic Enumuration and lua script does not sanitize the input from user which leads to remote code execution using the os.execute() and then after some enumuration find the id_rsa key for user r.michaels then decrypt the tar backup file and get the user r.micheals password and root part is pretty simple user r.mihaels has run the commmand doas as root user that leads to migrate from user to root privilage.
HackTheBox - Passage Writeup
Passage is the medium level hackthebox machine which is running in the linux.