This article originally appeared in TidBITS on 2014-12-22 at 11:13 p.m.
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OS X NTP Security Update (Yosemite, Mavericks, and Mountain Lion)

by Agen G. N. Schmitz

Apple has released OS X NTP Security Update for 10.10 Yosemite, 10.9 Mavericks, and 10.8 Mountain Lion to address a critical security issue [1] with the software that provides the Network Time Protocol (NTP) service, which is used to keep a computer’s internal clock synchronized with an external server. The updates are available via Software Update or via Apple’s Support Downloads Web site, but for the first time ever, Apple pushed this security update to at least some Macs automatically. For those still using 10.6 Snow Leopard, there’s an independent installer [2]. (All updates are free. For 10.10.1 Yosemite, 1.9 MB; for 10.9.5 Mavericks [3], 2.0 MB; for 10.8.5 Mountain Lion [4], 2.1 MB)