The most recent MAC system update 10.13.1 which was supposed to fix the root security flaw, actually enables it again. Apple Incorporated has not responded yet to this further problem. When Macintosh operating system high sierra was released, there was a major security flaw, where by someone could access your Macintosh by typing in root and NOT entering anything for a password.
This would allow anyone potentially access to all your files. Also, they could delete your files if they wanted to. This is a major computer security no no. You never want anyone to have root access on your Macintosh computer, unless you explicitly give them that access.
Apple Incorporated released MAC system update 10.13.1 that was supposed to resolve this issue. However, individuals that installed this patch that were running Macintosh operating system 10.13, also known as high sierra, still had this security flaw. One possible solution to make sure that indeed this root security flaw is patched is to install MAC system update 10.13.1 again.
Also, make sure to reboot your Macintosh computer after this update is installed. Some users have noticed that this MAC system update 10.13.1 does NOT install successfully until their Macintosh was rebooted. For whatever reason Macintosh users were not notified to reboot their computer after this 10.13.1 update installs.
After upgrading from Apple Macintosh 10.13, high sierra, to 10.13.1 you are advised to download 10.13.1 again and install it. Finally, you want to reboot your Macintosh computer so that this patch installs completely. Some Macintosh endusers claimed that after they upgraded from high sierra 10.13 to 10.13.1 they were notified by the App Store that 10.13.1 was available again.
Also, when they installed MAC system update 10.13.1 a second time, they noticed they had two 10.13.1 updates installed. There is no word yet from Apple Incorporated if they are going to release another update to fix this second problem with the root security flaw.