Security Only Update for .NET Framework 4.8 for Windows 8.1 and Windows Server 2012 R2 (KB4576489)

Applies to:

Microsoft .NET Framework 4.8

Summary

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.

Important

  • As a reminder to advanced IT administrators, updates to .NET Framework 3.5 for Windows 8.1 and Windows Server 2012 R2 should only be applied on systems where .NET Framework 3.5 is present and enabled. Customers who attempt to pre-install updates to .NET Framework 3.5 to offline images that do not contain the .NET Framework 3.5 product enabled will expose these systems to failures to enable .NET Framework 3.5 after the systems are online. For more extensive information about deploying .NET Framework 3.5, see Microsoft .NET Framework 3.5 Deployment Considerations.

  • All updates for Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2 require that update KB 2919355 is installed. We recommend that you install update KB 2919355 on your Windows 8.1-based, Windows RT 8.1-based, or Windows Server 2012 R2-based computer so that you receive updates in the future.

  • If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.

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

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 8.1 and Windows Server 2012 R2

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

Windows 8.1, Windows RT 8.1 and Windows Server 2012 R2 file information

Note: The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.

File information

File hash information

File name

SHA1 hash

SHA256 hash

Windows8.1-KB4576489-x64-NDP48.msu

DEB929A3A9B8B2481440A012E2EC1C177620BC13

5EAAF9C3A54C8A6E9AE6AFE29C928C6D9943C20B2F6E36084DA460905DBBB184

Windows8.1-KB4576489-arm-NDP48.msu

CEFA7FA65DAE6A95FE383D5CECF406B681DF510A

6EDBEAFCAE52D327F647F4641B5EB95837FB238CB42A46D3DC4F8F4CF7CC23C8

Windows8.1-KB4576489-x86-NDP48.msu

9CE5CEDCDD2EBE7020BBF0AFA12853CCF648AABF

C5B939F765521D9A2EF0383D460CCEC5B8C0A36788F86D32A5705D5543742F4A

For all supported x64-based versions

File name

File version

File size

Date

Time

Platform

Dfdll.dll

4.8.4240.0

214,912

29-Jul-2020

05:27

x64

System.deployment.dll

4.8.4240.0

1,595,136

29-Jul-2020

06:14

x86

System.deployment.dll

4.8.4240.0

1,595,136

29-Jul-2020

06:14

x86

Dfdll.dll

4.8.4240.0

178,056

29-Jul-2020

06:14

x86

For all supported ARM-based versions

File name

File version

File size

Date

Time

Platform

System.deployment.dll

4.8.4240.0

1,595,136

29-Jul-2020

06:14

x86

For all supported x86-based versions

File name

File version

File size

Date

Time

Platform

System.deployment.dll

4.8.4240.0

1,595,136

29-Jul-2020

06:14

x86

Dfdll.dll

4.8.4240.0

178,056

29-Jul-2020

06:14

x86

Information about protection and security

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