macOS Big Sur 11.2 beta 2, which was released yesterday, eliminates a feature that allowed Apple apps bypass third-party firewalls, security tools, and VPN apps, according to reports from ZDNet and security researcher Patrick Wardle.
macOS Big Sur 11 included a ContentFilterExclusionList that let Apple’s apps like the App Store, Maps, iCloud, and more to avoid firewall and VPN apps that users had installed. These apps were not able to filter or inspect traffic for some built-in Apple apps.
Security researchers believed that the feature, found last October, was a major security risk as malware could be designed to latch on to a legitimate Apple app and bypass security software. Users who had VPNs installed also risked exposing their real IP address and location to Apple’s apps.
Omg we did it!
Thanks to the community feedback (and ya, bad press) Apple decided to remove the ContentFilterExclusionList (in 11.2 beta 2)
Means socket filter firewalls (e.g. LuLu) can now comprehensively monitor/block all OS traffic!!
Read more: https://t.co/GJXkRA31e7 https://t.co/BCPqdCjkV0
— patrick wardle (@patrickwardle) January 13, 2021
Apple told ZDNet last year that the list was temporary and the result of a series of bugs related to the deprecation of network kernel extensions in macOS Big Sur. Apple has been addressing those bugs, and in the second beta of macOS Big Sur released yesterday, removed the ContentFilterExclusionList from the macOS code.
When macOS Big Sur 11.2 sees a release, Apple apps will be compatible with VPN apps and will no longer be able to bypass firewalls and other security tools.
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