Capture the FlagMedium
The One Open Rule
Lab for Firewalls: Stateless, Stateful & WAF
Scenario
The host firewalls everything by default, but one over-permissive rule slipped in. Read the iptables ruleset, find the port that's ACCEPTed, and connect to the service behind it.
Objective
Read the firewall rules to find the single allowed port, then use it.
lab ~ the one open rulenothing real runs
booting lab sandbox…
This sandbox is fully emulated in your browser, nothing real runs and nothing leaves your machine. Type help to see the tools available.