Apply the fixes immediately. Make sure your backups don't contain corrupted or modified by attackers data. This makes it easier to detect break-ins. Educating the people who work on the system Users should know that they are doing. They should be told to never give out their password to anyone and to also use hard to guess passwords.
Security is an ongoing process.
Make sure you are following the latest developments in the security arena. If you believe an attacker could have done any tampering with an OS, you may want to re-install the operating system from a safe medium. If that is the case, make sure to install the correct patches. If you believe the breakin occurred via a new bug, you should warn the FreeBSD Security Officer . Fix the security hole Install new software or apply patches to the old one in order to fix the problems.