You may have to hit "Unlock" a few times to get it to unlock, but it will eventually work unless you manually set a root password on your Mac, which you likely didn't. Next, click inside the password box, then hit the "Unlock" button. Remove your username and replace it with "root" instead. To test if your system could be hacked, go to the "Users & Groups" section in "System Preferences," and click on the lock icon at the bottom of the pane to make changes. Right now, this only appears to affect Mac users running macOS High Sierra 10.13.1. Root access gives them the ability to do anything they want. Just by using "root" as the username and a blank password on a privilege escalation prompt, someone can install malware on your computer, access hidden files, reset your passwords, and more. There's a new macOS vulnerability that hackers within physical reach of your computer can use to gain root access to your system and accounts.
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