“We are working on a software update to address this issue. Update: Apple has advised that they will develop a fix for the issue according to statement to 9to5Mac: You really shouldn't leave your Mac unattended at all until Apple fixes this, and you should shut off guest access for your device. Security vulnerabilities don't get a lot worse than this, as it requires almost no technical skills to pull it off. Naturally though, this is serious enough that Apple is likely working on getting a patch out as you're reading this. If you really want a fix right now, you can reinstall macOS 10.12 Sierra. It might take two or three tries to log in, although in some cases, we got it to work on the first try.Īccording to reports (meaning we haven't tested this), this isn't an issue on older versions of the OS. After signing in as a guest, it was possible to change security settings and install apps and software updates from the Mac App Store, just by typing the user name 'root'. Indeed, we tested this out on a Mac running 10.13.2 High Sierra - although it should work on the current 10.13.1 build - and it works quite easily. You can access it via System Preferences>Users & Groups>Click the lock to make changes.
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