macOS Big Sur 11.2.3 Update (20D91) is Live! What’s New?

MrMacintosh.com - macOS Big Sur 11.2.3 Update
macOS Big Sur 11.2.3 Update

The macOS Big Sur 11.2.3 (20D91) update is now available for all users!

Apple surprised us today by dropping a new Big Sur 11.2.3 update. The previous 11.2.2 update was released a little over 2 weeks ago. Let’s jump in and find out what’s new in the macOS Big Sur 11.2.3 Update!

This update focuses on one security fix.

WebKit

Available for: macOS Big Sur

Impact: Processing maliciously crafted web content may lead to arbitrary code execution Description: A memory corruption issue was addressed with improved validation.

CVE-2021-1844: Clément Lecigne of Google’s Threat Analysis Group, Alison Huffman of Microsoft Browser Vulnerability Research

Apple.com

Safari version 14.0.3 was also released.

macOS Big Sur 11.2.3 Patch Notes Summary

  1. 0 – New Features
  2. 1 – Resolved Issues
  3. 0 – Enterprise Changes

Mr. Macintosh macOS Big Sur 11.2.3 Update DEEP DIVE Video

Click “Continue Reading” for the rest of the article.

Apple Links

AppleSeed Notes Link = appleseed.apple.com/

Developer Public Link = developer.apple.com/documentation/macos-release-notes

Direct Link to macOS Big Sur 11.2 Patch Notes –https://developer.apple.com/documentation/macos-release-notes/macos-big-sur-11_2-release-notes

macOS Deployment References Changes – https://support.apple.com/guide/deployment-reference-macos/document-revision-history-apd04dff7069/web

Articles of interest for Apple Silicon & macOS Big Sur

How to reinstall macOS on your Apple Silicon M1 Mac

mrmacintosh.com/how-to-reinstall-macos-on-your-apple-silicon-mac-everything-you-need-to-know/

How to reinstall macOS with Apple Configurator 2 and IPSW Files.

mrmacintosh.com/restore-macos-firmware-on-an-apple-silicon-mac-boot-to-dfu-mode/

Apple Silicon IPSW macOS Big Sur Database

mrmacintosh.com/apple-silicon-m1-full-macos-restore-ipsw-firmware-files-database/

Previous Big Sur 11 Beta and Final Releases

  • 31. Big Sur 11.2.3 (20D91) – (03/08/21) – Current Release
  • 30. Big Sur 11.3 Beta 3 (20E5196f) – 03/02/21
  • 29. Big Sur 11.2.2 (20D80) – 2/25/21 – My Release Notes
  • 28. Big Sur 11.3 Beta 2 (20E5186d ) – 02/17/21
  • 27. Big Sur 11.2.1 (20D74) – 02/09/21 – My Release Notes
  • 26. Big Sur 11.3 Beta (20E5172i) – 02/02/21
  • 25. Big Sur 11.2 Final (20D64) – 02/01/21 – My Release Notes
  • 24. Big Sur 11.2 RC 3 (20D64) – 01/28/21
  • 23. Big Sur 11.2 RC 2 (20D62) – 01/25/21
  • 22. Big Sur 11.2 RC (20D53) – 01/21/21
  • 21. Big Sur 11.2 Beta 2 (20D5042d) – 01/13/21
  • 20. Big Sur 11.2 Beta 1 (20D5029f) – 12/16/20
  • 19. Big Sur 11.1 Final (20C69) – 12/14/20 – My Release Notes
  • 18. Big Sur 11.1 RC (20C69) – 12/10/20 – My Release Notes
  • 17. Big Sur 11.1 Beta 2 (20C5061b) – 12/03/20 – My Release Notes
  • 16. Big Sur 11.1 Beta 1 (20C5048k) – 11/17/20
  • 15. Big Sur 11.0.1 (20B50) – 11/19/20 – My Release Notes
  • 14. Big Sur 11.1 Beta (20C5048k) – 11/17/20 – My Release Notes
  • 13. Big Sur 11.0.1 Final (20B29) – 11/12/20 – My Release Notes
  • 12. Big Sur 11 Beta 11.0.1 (20B5022a) Beta 2 RC – 11/05/20 My Release Notes
  • 11. Big Sur 11 Beta 11.0.1 (20B5012d) Beta 1 – 10/28/20 – My Release Notes
  • 10. Big Sur 11 Beta 10 (20A5395g) – 10/14/20 – My Release Notes
  • 9. Big Sur 11 Beta 9 (20A5384c) – 09/29/20 – My Release Notes
  • 8. Big Sur 11 Beta 8 (20A5374i) – 09/22/20 – My Release Notes
  • 7. Big Sur 11 Beta 7 (20A5374g) – 09/17/20 – My Release Notes
  • 6. Big Sur 11 Beta 6 (20A5364e) – 09/03/20 – My Release Notes
  • 5. Big Sur 11 Beta 5 (20A5354i) – 08/19/20 – My Release Notes
  • 4. Big Sur 11 Beta 4 (20A5343i) – 08/04/20
  • 3. Big Sur 11 Beta 3 (20A5323l) – 07/22/20
  • 2. Big Sur 11 Beta 2 (20A4300b) – 07/07/20 – My Release Notes
  • 1. Big Sur 11 Beta 1 (20A4299v) – 06/22/20 – My Release Notes

macOS Big Sur 11 Installer Info

Note: Starting with macOS Big Sur, Combo and Delta update pkg’s aka packages are not available as standalone downloads.

More Info – eclecticlight.co/2020/12/17/apple-has-stopped-providing-standalone-installers-for-macos-updates/

Full Installer.app

The full installer of MacOS Big Sur 11.2.3 is now available.

InstallAssistant.pkg = Full download. Installing this package will add the full “Install macOS Big Sur.app” to your applications folder.

http://swcdn.apple.com/content/downloads/12/32/071-14766-A_Q2H6ELXGVG/zx8saim8tei7fezrmvu4vuab80m0e8a5ll/InstallAssistant.pkg

Link – macOS Big Sur Mac App Store

Size = 12.22GB

Product ID = 071-14766

Requirements – macOS Big Sur 11 Requirements

Apple Silicon M1 Update

Update size for Apple Silicon M1 Mac devices.

11.2.2 Update Size = 2.44GB – (3.37GB Actual)

11.2 Update Size = 2.5GB – (3.43GB Actual)

11.1 Update Size = 3.26GB – (4.19GB Actual)

11.0.1 Update Size 3.66GB – (4.59GB Actual)

Big Sur Delta Update

This is the update is for updating from 11.2.2 > 11.2.3

Size = 2.44GB – (2.88GB Actual)

Big Sur Combo Update

This is update is for updating from 11.0.1 > 11.2.3

Size = 2.5GB – (2.94GB Actual)

Apple Silicon Firmware Update

This update has a new firmware update. This version number is reported in System Information under “System Firmware Version“

Apple Silicon M1 Firmware Update = Not Updated – 6723.81.1

Previous Firmware Updates

  • 11. Big Sur 11.2.3 Final = 6723.81.1
  • 10. Big Sur 11.2.2 Final = 6723.81.1
  • 9. Big Sur 11.2.1 Final = 6723.81.1
  • 8. Big Sur 11.2 Final = 6723.81.1
  • 7. Big Sur 11.2 RC 2 = 6723.81.1
  • 6. Big Sur 11.2 Beta 2 = 6723.80.17
  • 5. Big Sur 11.1 Final – 6723.61.3
  • 4. Big Sur 11.1 Beta 2 – 6723.61.3
  • 3. Big Sur 11.1 Beta 1 -6723.60.62
  • 2. Big Sur 11.0.1 – 6723.50.2
  • 1. Big Sur 11.0 – 6723.41.11

T2 BridgeOS Update

The Version of BridgeOS for your T2 Security Chip (2018-2020 Intel Macs) was updated.

BridgeOS version = Not Updated – 18.16.14347.0.0 – Build version 5

ProductID = 071-14749

Size = 441.8MB

Previous T2 Bridge Updates

  • 16. 11.2.3 Prod = 18.16.14347.0.0 – Build version 5
  • 15. Previous 11.2.2 Prod = 18.16.14347.0.0
  • 14. Previous 11.2.1 Prod = 18.16.14346.0.0
  • 13. Previous 11.2 Prod = 18.16.14346.0.0
  • 12. Previous 11.1 Prod = 18.16.13030.0.0 Build Version 11
  • 11. Previous 11.1 RC = 18.16.13030.0.0
  • 10. Previous 11.1 Beta 2 = 18.16.13026.5.2
  • 9. Previous 11.1 Beta = 18.16.13017.5.3
  • 8. Previous Beta RC2 = 18.16.12560.5.1
  • 7. Previous Beta 11 = 18.15.12551
  • 6. Previous Beta 10 = 18.16.12402.5.2
  • 5. Previous Beta 9 = 18.16.12390.5.1
  • 4. Previous Beta 8 = 18.16.12380 Build Version 3
  • 3. Previous Beta 7 = 18.16.12380
  • 2. Previous Beta 6 = 18.16.12370.5.1
  • 1. Previous Beta 5 = 18.16.10358.5.2

Apple Silicon IPSW Restore file Update

Apple has released the full IPSW restore file for Apple Silicon Macs. I keep track of all of them in my Apple Silicon Firmware Database

Apple Silicon M1/M2/M3/M4/M5 macOS IPSW Firmware Restore Files Database
  • 1. macOS Big Sur 11.2.3 = UniversalMac_11.2.3_20D91_Restore.ipsw
  • 2. macOS Big Sur 11.2.2 = UniversalMac_11.2.2_20D80_Restore.ipsw
  • 3. macOS Big Sur 11.2.1 = UniversalMac_11.2.1_20D74_Restore.ipsw
  • 4. macOS Big Sur 11.2 = UniversalMac_11.2_20D64_Restore.ipsw
  • 5. macOS Big Sur 11.1 = UniversalMac_11.1_20C69_Restore.ipsw
  • 6. macOS Big Sur 11.0.1 = UniversalMac_11.0.1_20B29_Restore.ipsw

Security Content of macOS Big Sur 11.2.3

macOS Big Sur 11.2.3 Security Document

https://support.apple.com/en-us/HT212220

macOS Big Sur 11.2.3 (20D91) Release Notes

Overview

macOS Big Sur 11.2.3 Update — Restart Required

Released March 8, 2021

WebKit

Available for: macOS Big Sur

Impact: Processing maliciously crafted web content may lead to arbitrary code execution

Description: A memory corruption issue was addressed with improved validation.

CVE-2021-1844: Clément Lecigne of Google’s Threat Analysis Group, Alison Huffman of Microsoft Browser Vulnerability Research

macOS Big Sur 11.2.3 Update

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9 thoughts on “macOS Big Sur 11.2.3 Update (20D91) is Live! What’s New?”

  2. The link to the update Big Sur 11.2.3 listed above dose not work I get error code 404 page not found .Am using Safari 14.0.2 on iMac 2012 running Big Sur 11.1 .

      1. Try to copy And past still get 404code not Secure tried another link to from your site and it worked but still can’t download update for Big Sur 11.2.3

  3. Pingback: Michael Tsai - Blog - macOS 11.2.3

  4. Safari 14.0.3 finally fixes the bug, introduced with Safari 14 that didn’t allow clicking on Upload buttons, I run Safari 14.0.3 on Mojave 10.14.6

    1. How is that possible? One wouldn’t be able to run the latest version of Safari without updating to the latest macOS right? If I am wrong, please guide me on how to update only Safari.

  5. Under today’s update about the release of macOS Big Sur version of 11.2.3, it says, “Safari version 14.0.3 was also released.”

    Safari 14.0.3 was released on February 1, 2021.

    Was there a newer version released today?

    1. Answering my own question: Apple released an update to address CVE-2021-1844. Safari 14.0.3 gets a new build number, but not a new version number.

      Which strikes me as very odd. Has Apple ever released an app security-patch without changing the app’s version number?

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