Affected Macs, which can be running any version of macOS from El Capitan to Catalina, suffer severe problems running the new version of MRT. Unlike XProtect, whose data files are used on demand, MRT is normally run in two situations: shortly after it has been updated, and soon after a Mac starts up. Some, but by no means all, Macs then suffered a problem as a result of the new version of MRT. That doesn’t happen immediately, but for Macs in daily use, that means that most will have been updated by 2359 UTC on 20 October. Macs which run with Software Update set to Install system data files and security updates then automatically download and install those updates. These normally happen every two weeks or so, and are silent in that Apple doesn’t announce them, or even admit that they’ve happened. Some time before 2200 UTC on Monday 19 October, Apple pushed routine updates to its security tools, XProtect and MRT. This article explains what happened, and what you can do about them. Last week a great many Mac users were struck by one or both of two serious problems.
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