November 28, 2017
Major Apple security flaw grants admin access on macOS High Sierra without password

There’s a major flaw in Apple’s macOS High Sierra operating system that allows anyone with physical access to a Mac to gain system administrator access without so much as entering a password. Late Tuesday, Apple confirmed that it’s working on a software update to fix the issue and published step-by-step instructions to help customers protect their machines in the meantime.
The vulnerability was publicly disclosed on Twitter this afternoon; it’s not clear whether the problem was privately reported to Apple ahead of time, which is the encouraged practice when security vulnerabilities are uncovered. (The company maintains an invite-only bug bounty program.) Despite its incredibly alarming simplicity, The Verge is not reproducing the steps to bypass High Sierra’s login screen here. It does not affect Sierra or other previous macOS versions.
However, The Verge has been able to confirm the major security issue remains present as of MacOS 10.13.1, the current release of High Sierra. When the problem is exploited, the user is authenticated into a “System Administrator” account and is given full ability to view files and even reset or change passwords for pre-existing users on that machine. Apple ID email addresses tied to users on the Mac can be removed and altered, as well. There are likely many more ways that someone taking advantage of the issue could wreak havoc on a Mac desktop or laptop.
The level of unbridled access this security hole permits — and it abruptly being made public — will almost certainly prompt Apple to move fast in releasing an update for its Mac operating system. The company hasn’t yet provided a release timeframe for that update.
Until that happens, the best way to protect your Mac against the issue reported today is by ensuring that you’ve set a root password. To do that, go to System Preferences > Users & Groups > Login Options > Join > Open Directory Utility > Edit pulldown menu. Enable the Root User if you haven’t already and then choose Change Root Password.

Major Apple security flaw grants admin access on macOS High Sierra without password

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