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su, is important to check that root's password is locked. Otherwisesu rootis possible from a non-sudoer account. Editing/etc/pam.d/su(described here) is maybe a good idea for extra protection. I don't use SSH to grant access to my computer but I'll leave this recommendations linked for future reference. I'm (still) in sane levels of paranoia, I think we can skip the extremely exotic dangers.