Security and Quality Rollup for .NET Framework 4.8 for Windows Server 2012 (KB4576485)

Applies to: .NET Framework

Summary


Security improvements

ClickOnce will no longer download applications from untrusted servers which use NTLM authentication, but, instead, will fail with “Authentication failed”. Sites in the Local Intranet and Trusted sites zones will continue to authenticate as before.

Quality and reliability improvements

CLR1

- Addresses an issue in some 32 bit apps where, in certain scenarios, the JIT might omit a function call

- Improved support for cleaning up private temporary certificate keys

WPF2

- Addresses an issue with a null-reference crash in automation code, arising from re-entrancy when reconnection to a remote desktop.


1 Common Language Runtime (CLR)
2 Windows Presentation Foundation (WPF)

Additional information about this update


The following articles contain additional information about this update as it relates to individual product versions.
 
  • 4576629 Description of the Security and Quality Rollup for .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows Server 2012 (KB4576629)

How to obtain and install the update


Before installing this update

Prerequisite:

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

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.
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 update will automatically sync with WSUS if you configure Products and Classifications as follows:

Product:Windows Server 2012

Classification: Security Updates

Prerequisites

To apply this update, you must have .NET Framework 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.

Update deployment information

For deployment details for this security update, go to the following article in the Microsoft Knowledge Base:

20200908 Security update deployment information: September 8, 2020

Update removal information

Note We do not recommend that you remove any security update. To remove this update, use the Programs and Features item in Control Panel.

Update restart information

This update does not require a system restart after you apply it unless files that are being updated are locked or are being used.

File information



File information
The English (United States) version of this software update installs files that have the attributes that are listed in the following tables.

Windows Server 2012 file information

Information about protection and security