12-02-2017
You cannot change a root password using just grub. The system boots from a hard drive and the password is stored in encrypted form there.
IF you have access to the system console and IF you know what you're doing, you can boot from DVD IF you have the media and IF booting from DVD is not denied, and remove the root password.
Without solid knowledge of the Operating System (how to mount/dismount filesystems, what file(s) to change and exactly how to do that, it's far from easy. Even many system managers don't even know how to start the process without searching for it and, typically, asking a question on this forum. You need access to the console terminal to even start and servers are often locked away in a computer room.
Don't be too concerned. If it was that easy everybody would be doing it. Keep your security policy tight though.
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