Rooted!
The box is easy and pretty straight forward, but you need to work on it;
Foothold: Recreate the environment in order to get r*e. Should be 2 commands in the host version (not docker). Test it first, but remember that not all default binaries are there.
User: If you can’t crack it, change it. Please restore/reset the machine.
Root: It’s in that list. Look carefully, because it is easy.