Actively exploited Mac 0-day neutered core OS security defenses

Actively exploited Mac 0-day neutered core OS security defenses

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When Apple released the latest version 11.3 for macOS on Monday, it didn’t just introduce support for new features and optimizations. More importantly, the company fixed a zero-day vulnerability that hackers were actively exploiting to install malware without triggering core Mac security mechanisms, some that were in place for more than a decade.

Together, the defenses provide a comprehensive set of protections designed to prevent users from inadvertently installing malware on their Macs. While one-click and even zero-click exploits rightfully get lots of attention, it’s far more common to see trojanized apps that disguise malware as a game, update, or other desirable piece of software.

Protecting users from themselves

Apple engineers know that trojans represent a bigger threat to most Mac users than more sophisticated exploits that surreptitiously install malware with minimal or no interaction from users. So a core part of Mac security rests on three related mechanisms:

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