August Season: Cutting the Wire
Three boxes, three severed paths — DNS, firewall rules, and a route that was never supposed to disappear. Someone made sure nothing connected the way it should before they left. Trace each break, repair it properly, and recover what's waiting on the other side. All on sandboxes you fully control. Defensive practice only.
Archived season — playable for practice, no leaderboard points. Official write-ups are open.
DNS: The Parting Shot
forensics · dns · networking
Firewall: The Rule They Slipped In
forensics · firewall · nftables
Reach the Evidence Server
forensics · networking · dns
Firewall: The Rule They Slipped In
275 pts · decays to 110 · +50 first bloodSomeone with access gave themselves a way back in before things got locked down: one extra accept rule, buried in an otherwise normal-looking nftables config, dressed up with a comment that could pass for legitimate at a glance. Find it, remove it cleanly without touching the rules that belong, and recover what they left as a receipt.
The live sandbox for this challenge isn't available yet — brief and hints are open.
Hints
Read the whole ruleset: cat /etc/nftables.conf. Count how many accept rules make sense for this box.
Submit flag
Sign in to submit flags and get on the board.
Archived — solves are for practice, not the leaderboard.
Season standings
loading standings…