General Steps for Hardening Security on a System

  • Keep track with the latest vulnerabilities and patch your system

  • Be aware about the services running and disable unneded services and ports

  • Protect running services with tcp_wrappers if possible

  • On the Internet, use only secure services

  • Protect running network services with netfilter firewall

  • Verify open ports and firewall rules with port scans

  • Protect sensitieve data exchange over the internet with encryption

  • On multi-user systems, protect access to user accounts (password hashes), set correct permissions on home directories, set disk quotas, establish user policies regarding passwords, applications, data, etc.
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