Apple releases macOS Big Sur 11.3.1 with WebKit security fixes

Apple has released macOS Big Sur 11.3.1 with security fixes for two WebKit issues. The company has noted that these security flaws may have been actively exploited, and it is recommended that the software update be installed right away.

What’s new in macOS Big Sur 11.3.1?

The update is a minor one but it fixes a few important security issues related to WebKit memory corruption and input validation. These issues could allow hackers to execute code on a target Mac. Apple has noted that these issues may have been actively exploited in the wild, therefore we recommend that the updates be installed as soon as possible.

Here are the complete details of the WebKit security patches in macOS Big Sur 11.3.1:

WebKit

Available for: macOS Big Sur

Impact: Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.

Description: A memory corruption issue was addressed with improved state management.

CVE-2021-30665: yangkang (@dnpushme)&zerokeeper&bianliang of 360 ATA

WebKit

Available for: macOS Big Sur

Impact: Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.

Description: An integer overflow was addressed with improved input validation.

CVE-2021-30663: an anonymous researcher

Apple had previously released macOS Big Sur 11.3, which was a huge update and featured improvements for iOS apps on M1 Macs, PlayStation 5 and Xbox Series X game controller support, and more. The update also featured over 50 security fixes, some of which allowed apps to easily bypass security protections on Macs.

macOS Big Sur 11.3.1 compatible Macs

macOS Big Sur 11.3.1 is compatible with the following Macs:

• MacBook Air (2013 and newer)
• MacBook Pro (late 2013 and newer)
• MacBook (2015 and newer)
• iMac (2014 and newer)
• iMac Pro (2017 and newer)
• Mac mini (2014 and newer)
• Mac Pro (2013 and newer)

How to upgrade to macOS Big Sur 11.3.1?

On your Mac, go to System Preferences > Software Update to download and install the new update. If you are using a MacBook, make sure that it is connected to a power outlet throughout the update process.