This article originally appeared in TidBITS on 2015-10-22 at 2:53 p.m.
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Mac EFI Security Update 2015-002

by Agen G. N. Schmitz

Apple has released Mac EFI Security Update 2015-002 [1] for OS X 10.9.5 Mavericks, which addresses an issue where the EFI (Extensible Firmware Interface) could potentially be overwritten without authorization. This update is available as a direct download [2] as well as via Software Update. (Free, 82 MB, 10.9.5)