Cybersecurity · hands-on lab
Security Lab 06: Linux Hardening and Attack-Surface Reduction
Close unneeded ports, lock down SSH, and raise a measured hardening score with lynis.
- 40 minutesTime in the lab
- intermediateLevel
- 5 tasksChecked automatically
- CertificateVerifiable link when you finish
The situation
Scenario. target passed into your care in a loose default state. Your job is to shrink its attack surface: only the services it needs, SSH configured safely, and a measurable before/after using the lynis auditing tool.
What you will do
- Baseline audit
- Disable the insecure service
- Lock down SSH
- Turn on the firewall
- Why remove telnet when SSH exists?question
How it works
The lab opens in your browser: a real terminal or desktop, nothing to install. Work through the tasks, press Check after each one and the portal verifies your work. Stuck? Ask for a hint. Finish every task and you get a certificate page with its own verification link for LinkedIn or your CV.