Bug that let malicious files slip past defenses now fixed in Big Sur 11.3
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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.