Hi,
Very interesting topic.
I would say, like on any linux box:
- Change to root password to something including numbers, lower case chars, upper case chars and special symbols such as '$' or '!'
- Enable firewall on your Internet router and define firewall policy rules so that you only allow what you absolutely need to go in and out, all the rest being denied. In particular, do not forward any port from your internet router to your vu+ box unless you absolutely need to do so (e.g. SSH access).
- If you access your box remotely over the Internet, use SSH instead of telnet and force key authentication instead of password auth for SSH.
- disable (already good) or uninstall (even better) any service you don't need (e.g. if you know you're never going to use Windows/cifs/smb shares, disable samba)
- update/patch the package whenever a vulnerability is discovered in a software package installed on your box
Hope this helps.
FCXpress