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Apple fixes macOS zero-day bug which was exploited by Shlayer malware

April 26, 2021

Shlayer malware exploited a zero-day vulnerability in macOS to bypass Apple's File Quarantine, Gatekeeper, and Notarization security checks and download second-stage malicious payloads in the wild.

Shlayer's creators have previously succeeded in getting their malicious payloads past Apple's automated notarizing process.