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Apple Fixes Root Access Bug with Security Update

Yesterday a serious security flaw in macOS High Sierra was discovered that let someone with access to a Mac running Apple’s latest OS gain root access to the its data. Today, Apple released Security Update 2017-001, which fixes the issue. The release notes to the update describe the issue as follows:

Impact: An attacker may be able to bypass administrator authentication without supplying the administrator’s password
Description: A logic error existed in the validation of credentials. This was addressed with improved credential validation.

In a comment to Rene Ritchie of iMore.com, Apple said:

Needless to say, this is an important update that should be installed as soon as possible.