Scenario: "Cadiz": Cut the live wires

Level: Hard

Type: Fix

Tags: linux-other  

Access: Email

Description: Your host is wired into a demolition circuit. cable processes are the wires. They talk only to a root supervisor, fuse, to keep it convinced the circuit is intact. Some cables are live; the others are decoys. deton processes (also root) are the charges. They talk only to fuse, never to the cables. That supervisor is what fires them. You cannot kill deton or fuse. You do not have general root access. You can only cut cables.

To cut a cable, kill -9 it. Cut all the live cables (and only those), and cut them together. Any other cut resets the circuit: fuse fires the deton charges and rolls a new live set.

Root (sudo) Access: False

Test: The charges are gone (deton has exited) and the root-owned stamp /var/lib/fuse/disarmed exists. That stamp is created only by the supervisor when the live wires drop together. Creating a file in your home directory does not count. The stamp remains across reboot.

The "Check My Solution" button runs the script /home/admin/agent/check.sh, which you can see and execute.

Time to Solve: 20 minutes.