Security Update 2018-003 (Sierra and El Capitan)
Apple has released Security Update 2018-003 for macOS 10.12 Sierra and 10.11 El Capitan, patching security vulnerabilities that the company addressed in 10.13.5 High Sierra (see “macOS 10.13.5 High Sierra Brings Messages in iCloud,” 1 June 2018). The security updates for both Sierra and El Capitan address an information disclosure issue in Bluetooth that could enable a malicious application to determine kernel memory layout, a memory corruption issue with FontParser that could lead to arbitrary code execution, a validation issue with graphics drivers that could allow an application to read restricted memory, and a denial of service issue with the kernel. (Free. For 10.12.6 Sierra, 742 MB; for 10.11.6 El Capitan, 831 MB; security content release notes)
Unable to update to it on latest 10.12.6 through the App Store. It shows the update but when I click on the grey update button nothing happens. No downloading or anything. The other weird thing is the update only reveals itself if I first click on another tab such as “featured” then click back again on the updates tab and only then will it show up.
I was able to download the dmg from the Apple website, but I think I’m going to hold off on it because of the odd behavior from the App Store.
I had a similar experience a couple of days ago with several app updates, but I had already applied Security Update 2018-003 the week before.
I know of no reason to hold up with installing the .dmg version and a half dozen reason why you should install it immediately, listed here:
https://lists.apple.com/archives/security-announce/2018/Jun/msg00000.html
-Al-
I’d recommend installing from the .dmg—the way you describe the problems sounds very much like an App Store quirk, not anything related to the update.