Release Date:September 12, 2023

Version:.NET Framework 3.5 and 4.8.1

The September 12, 2023 update for Azure Stack HCI, version 21H2 includes security and cumulative reliability improvements in .NET Framework 3.5 and 4.8. We recommend that you apply this update as part of your regular maintenance routines. Before you install this update, see the Prerequisites and Restart requirement sections.

Summary

Security Improvements

CVE-2023-36796 - .NET Framework Remote Code Execution Vulnerability This security update addresses a vulnerability in DiaSymReader.dll when reading a corrupted PDB file which can lead to Remote Code Execution. For more information see CVE 2023-36796.

CVE-2023-36792 - .NET Framework Remote Code Execution Vulnerability This security update addresses a vulnerability in DiaSymReader.dll when reading a corrupted PDB file which can lead to Remote Code Execution. For more information see CVE-2023-36792.

CVE-2023-36793 - .NET Framework Remote Code Execution Vulnerability This security update addresses a vulnerability in DiaSymReader.dll when reading a corrupted PDB file which can lead to Remote Code Execution. For more information see CVE-2023-36793.

CVE-2023-36794 - .NET Framework Remote Code Execution Vulnerability This security update addresses a vulnerability in DiaSymReader.dll when reading a corrupted PDB file which can lead to Remote Code Execution. For more information see CVE-2023-36794.

CVE-2023-36788 - .NET Framework Remote Code Execution Vulnerability This security update addresses a vulnerability in the WPF XAML parser where an unsandboxed parser can lead to remote code execution. For more information see CVE 2023-36788.

Quality and Reliability Improvements

WPF

- Addresses an issue where the layout of collapsed panels are affected by CollectionChanged event.

Runtime

- Addresses an issue where unpredictable crashes which could occur in multi-appdomain scenarios running on arm64.

- Addresses an issue where AnchorInfo was miscalculated hen controls scaled on higher DPI settings and thus location may be calculated incorrect.

ASP.NET

- Addresses an issue in the AspNetEnforceViewStateMac regkey logic.

1Windows Presentation Foundation (WPF)

Additional information about this update

The following articles contain additional information about this update as it relates to individual product versions.

  • 5030186 Description of the Cumulative Update for .NET Framework 3.5 and 4.8 for Azure Stack HCI, version 21H2 (KB5030186)

Known issues in this update

Microsoft is not currently aware of any issues in this update.

How to get this update

Install this update

Release Channel

Available

Next Step

Windows Update and Microsoft Update

Yes

None. This update will be downloaded and installed automatically from Windows Update.

Windows Update for Business

Yes

None. This update will be downloaded and installed automatically from Windows Update.

Microsoft Update Catalog

Yes

To get the standalone package for this update, go to the Microsoft Update Catalog website.

Windows Server Update Services (WSUS)

Yes

This individual .NET Framework product update will be installed, as applicable, by applying the operating system update. For more information about operating system updates see additional information about this update section.

File information

For a list of the files that are provided in this update, download the file information for cumulative update.

Prerequisites

To apply this update, you must have .NET Framework 3.5 or 4.8 installed.

Restart requirement

You must restart the computer after you apply this update if any affected files are being used. We recommend that you exit all .NET Framework-based applications before you apply this update.

How to obtain help and support for this update

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