Apple patches Meltdown for older versions of MacOS

In security update, Apple backports Meltdown fix to older macOS versions

Additionally, Apple has also released macOS El Capitan 10.11.6, macOS Sierra 10.12.6, which fixed the recently found Meltdown bug, and macOS High Sierra 10.13.3.

Some people might be a bit miffed about why Apple left older version of macOS out of the first patch, and such a move could fuel conspiracies around Apple forcing people to move to its latest systems and tech.

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.

Less-hyped, but still serious, are vulnerabilities in the macOS kernel that include an exploitable race condition (CVE-2018-4092), a validation issue (CVE-2018-4093), and memory initialization bug (CVE-2018-4090) that could also allow restricted memory to be read.

Meltdown and Spectre, another chip vulnerability revealed at the same time, take advantage of a modern processor performance feature called speculative execution, which improves speed by operating on instructions which may be used in future. The update means more Mac users will be safe from a vulnerability that affects hundreds of millions of chips made by Intel over the past twenty years.

To download and install the security update, open the App Store app on your Mac, click on Updates in the toolbar, and click the Update button next to the appropriate software update. Those running macOS Sierra should look for version 10.12.6.

Accompanying 10.13.3 for High Sierra are. Patches to operating systems are one of the key ways to protect computers. "We are still planning to issue a mitigation", the representative said.



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