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Bug that let malicious files slip past defenses now fixed in Big Sur 11.3 Share
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Apple has released macOS 11.3, fixing a serious flaw that allowed an attacker to sneak malicious files past the operating system s Gatekeeper security mechanism.
Gatekeeper is one of the primary macOS defenses against the installation of malware, explained Cedric Owens, the security researcher who found the bug, in a message to
The Register.
The vulnerability, he said, lets an attacker rig a malicious file so it won t get blocked by Gatekeeper when a user tries to open it. He considers it to be one of the most dangerous he s encountered on recent versions of macOS.