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Google Project Zero discloses zero-day in Apple macOS Kernel

Cybersecurity expert at Google Project Zero has publicly disclosed details and proof-of-concept exploit for a high-severity security vulnerability in macOS operating system.

Google Project Zero white hat hacker Jann Horn disclosed the flaw according to the 90-days disclosure policy of the company because Apple failed to address the issue within 90 days of being notified.

The zero-day flaw was demonstrated by Ian Beer, it resides in the way macOS XNU kernel allows an attacker to manipulate filesystem images without informing the operating system.

The vulnerability could be exploited by an attacker or a malicious application to bypass the copy-on-write (COW) functionality to cause unexpected changes in the memory shared between processes.

The flaw could potentially lead to memory corruption attacks.

“Copy-on-write(CoWorCOW), sometimes referred to asimplicit sharingorshadowing, is a resource-management technique used in computer programming to efficiently implement a “duplicate...(continued)

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