I know you're making a joke, but it's trivially easy to reset the admin password on a computer.
On that point though, If you can change the password of an admin account on any Mac (that doesn't have filevault on), then you can use that to obtain root privileges on any Mac.
The privilege escalation exploit mentioned in the OP, while technically not remotely exploitable, can be used by malware with lower privileges (i.e. malware running as an unprivileged user, which got onto the machine either through a remote exploit or some sort of drive-by download) to silently elevate itself to root. That's something that shouldn't be possible.