This article originally appeared in TidBITS on 2018-01-25 at 4:45 p.m.
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Security Update 2018-001 (Sierra and El Capitan)

by Agen G. N. Schmitz

Apple has released Security Update 2018-001 for macOS 10.12 Sierra [1] and 10.11 El Capitan [2], patching security vulnerabilities that the company addressed in 10.13.3 High Sierra (see “Apple Releases iOS 11.2.5, macOS 10.13.3, watchOS 4.2.2, and tvOS 11.2.5 [3],” 23 January 2018). Both of the older operating systems also resolve kernel-related issues associated with the Meltdown security vulnerability (see “Apple Releases Meltdown and Spectre Info and Updates [4],” 5 January 2018), plus a Wi-Fi-related vulnerability that could allow an application to read restricted memory. Additionally, the security update for 10.12 Sierra deals with a memory corruption issue that could allow arbitrary code execution after processing a maliciously crafted audio file. (Free. For 10.12.6 Sierra, 766.6 MB; for 10.11.6 El Capitan, 863 MB; security content release notes [5])