On Tuesday, March 11, Apple dropped a series of updates for its devices. That includes iOS 18.3.2 for iPhones; iPadOS 18.3.2 for iPads, macOS Sequoia 15.3.2 for Macs, Safari 18.3.1, tvOS 18.3.1, and visionOS 2.3.2 for Apple Vision Pro.
It appears an out-of-bounds write issue (which happens when a program writes data that does not belong to it) allowed bad actors to attack users running versions of iOS older than 17.2. Apple's language implies that these are capable actors with specific targets, and while Apple doesn't say, it's possible that involves high-profile personalities such as politicians or journalists. The company says the issue was blocked in iOS 17.2, but since there are users who were attacked running earlier versions of iOS, it seems this update was necessary regardless.
Security patches vs. software updates
Some platforms separate security patches and software updates as two distinct processes. Not Apple. Usually, the company couples security patches and software updates together, which creates some interesting situations. You can have a feature-filled software update that is also full of security patches, a feature-filled software update with few (or no) security patches, or a software update with few (or no) features, and any number of security patches.
These are the times when you see software updates on your iPhone or Mac that look like a weirdly long string of numbers—iOS 18.3.2, for example. iOS 18 is the big update, with all the keynote features; 0.3 is the minor update, that comes with some new features; and while it's possible a 0.0.2 update could come with new features, it usually denotes security patches and bug fixes.
This isn't a Security Response, though: This is an update, that just so happens to be a security patch. I know—not confusing at all.
How to install a security patch on your Apple device
General > Software Update, then follow the on-screen instructions to download and install the latest update.
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