Along with macOS High Sierra 10.13.3, Apple has now released two further security updates.
Earlier this morning Apple released iOS 11.2.5, along with watchOS 4.2.2 and tvOS 11.2.5 for download, and now macOS High Sierra 10.13.3 is out as well. Now this week, Apple has begun pushing out the patch to macOS Sierra and El Capitan users.
The company then patched the Spectre flaws (CVE-2017-5753 and CVE-2017-5715) in a separate security update released on January 8, 2018, for macOS High Sierra 10.13.2, iOS 11.2.2, and Safari 11.0.2. This update also includes bug fixes and improvements.
The Meltdown issue was first disclosed at the beginning of the month alongside another issue called Spectre that many companies have said is harder to exploit.
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The update comes with some additional security update for the Meltdown and Spectre vulnerabilities that Apple patched previously. Although updating systems is one of the most important ways to protect against security vulnerabilities, many do not update their systems for fear of breaking legacy software.
Apple announced these security updates in their security support document and asks that the updates are installed immediately. If your Mac is enrolled, the message "Your computer is set to receive beta software update" is shown ● Install the macOS Developer Beta After completing enrollment, install the developer beta from Updates in the Mac App Store.
Both vulnerabilities take advantage of the so-called "speculative execution mechanism" in processors.
On the other hand, Apple has insisted that its Meltdown fix has no measurable performance impact, according to its own benchmark testing.