It allows anyone to access high level security areas on an iMac or MacBook without the need for a password.Apple has warned Mac users after a serious macOS High Sierra root bug was discovered and ahead of a fix being released you can take these steps to protect your iMac and MacBook immediately.
Apple said: “We are working on a software update to address this issue." In the meantime, setting a root password prevents unauthorized access to your Mac.
• To enable the Root User and set a password, please follow the instructions here.
If a Root User is already enabled, to ensure a blank password is not set, please follow the instructions from the ‘Change the root password’ section. more
UPDATE — THE FIX IS IN
Apple issues the software update. more
