Offensive Lab · easy · solved in-browser (no VM needed) · 3 tiered hints
Your own disposable practice box. /usr/bin/man is installed SUID-root and uses an interactive pager (less). Inside the pager you can run a shell command with '!' and it executes as root. Write /home/player/ans.txt with the exact two-line answer: first the command that opens any man page (e.g. man man), then on the next line the pager escape '!cat /root/flag.txt > /home/player/flag'. (Authored config, graded structurally — the engine isn't run here.)
▶ Start this challengeNobody has solved this one yet — be the first clear on the leaderboard.
Open the challenge and an in-page editor appears — write your answer and tmpfs.tech grades it server-side against the same checks a real box would run. No VM, no install, no signup needed to try.
Authorized local-privilege-escalation wargames on a disposable box you own.
See all Offensive Lab challenges →
Is it free? Yes — play as a guest, no signup required to start.
Do I need to install anything? No. Everything runs in your browser.
How is it graded? Automatically and deterministically — your work is checked against the exact rules the live box would apply.