A macOS Security flaw opened access to users who didn’t have root passwords. So Apple updated computers overnight
To check whether you have the proper build, choose Apple Menu () > About This Mac. Click the System Report button and scroll down to Software. Click the word Software. You should be running 17B1003.
Clicking the version in About This Mac also shows the build number
— __NSCFGuoyeZhang (@cc941201) November 30, 2017