A beginner/intermediate VM, with only a few twists by author g0tmi1k. Apparently 2 ways to get limited shell and 3 ways to get root.
First of 3 in the Brainpan series created by superkojiman. A fun challenge with a easy BoF entry.
Author KookSec created this machine to help others learn some basic CTF strategies and some tools. This machine is aimed to be very similar in difficulty to those found in the OSCP – which it was. This is a large post, but lists the 3 privilege escalation paths. What a great challenge.