[ubuntu] How secure are my work computers?

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http://ubuntuforums.org – Ive had some help setting up a vnc network at work so one computer can access another, for the sake of tech support, although after googling about vnc I wanted to test how secure it is from people with physical access to the machine, I was able to get the passwd file for vnc easily without root privilidges and the vnc man pages say that the password can be obtained from that, how is this done? Is additional software needed? Just to clarify this is not a malicious act, I already have a list of all the passwords including root and vnc password but I'm trying to test the security and approach (Hardware)