I am really enjoying this box, so far managed to get low level shell in 15-20 mins, the user escalation was pretty simple for me, I have just completed the “overthewire” bandit tutorials, and the file type jogged my memory straight away, so I had user shell within 30 mins. I also have also worked out why the box is called ‘curling’, now just to exploit this, having an issue with other users over writing my data before my plan works. I’ll attempt root again and at quieter period.
Edit: It wasn’t others users, it was clearly a cron. I have root, be quick 