[integrate-this]

Or run nmap, or look at your own IP address and just guess at it, or look at your /var/log/messages and ssh logs, all of which are likely just as effective and way less time-consuming than cracking hashed host information.

This isn't really a vulnerability. It's a curiosity. If you're on the sever (or NFS), and have access to this information already, then you're already in pretty damn good shape. This just allows you to be more thorough.