[macOS High Sierra Users]: Please update the software update for fixing ‘root’ critical security bug.
Dear macOS High Sierra Users. The bug is that the attacker can get the administrator permission without password. In detail: http://www.bbc.com/news/technology-42161823 (BBC News) The bugfix was released (Security Update 2017-001). Please update the software update (https://support.apple.com/en-us/HT201541). Regards, Kitani, Chief of Information Processing Office.