06-30-2013
Anything open to access is part of the attack surface and can be attacked though whether this allows a successful hack is another matter.
The only way to secure a server is consider attacks and what you can do to prevent them.
In your case, you may have strong passwords, but are you going to know if someone tries your root account 506938 times with a brute force attack until they happen to find your password? Does your version of openssh have any security vulnerabilities that are remotely vulnerable? If you give someone else access, how do you know that they are changing things appropriately and not introducing vulnerabilities?
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apt(8) System Manager's Manual apt(8)
NAME
apt - Advanced Package Tool
SYNOPSIS
apt
DESCRIPTION
APT is a management system for software packages. For normal day to day package management there are several frontends available, such as
aptitude(8) for the command line or synaptic(8) for the X Window System. Some options are only implemented in apt-get(8) though.
SEE ALSO
apt-cache(8), apt-get(8), apt.conf(5), sources.list(5), apt_preferences(5), apt-secure(8)
DIAGNOSTICS
apt returns zero on normal operation, decimal 100 on error.
BUGS
This manpage isn't even started.
See <http://bugs.debian.org/apt>. If you wish to report a bug in apt, please see /usr/share/doc/debian/bug-reporting.txt or the report-
bug(1) command.
AUTHOR
apt was written by the APT team <apt@packages.debian.org>.
Debian GNU/Linux 16 June 1998 apt(8)