Applies to:

Microsoft .NET Framework 4.8

REMINDER

  • As a reminder to advanced IT administrators, updates to .NET Framework 3.5 for 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.

  • 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.

The August 8, 2023 update for Windows Server 2012 R2 includes security improvements in .NET Framework 4.8. We recommend that you apply this update as part of your regular maintenance routines. Verify that you have installed the required updates listed in the How to get this update section before installing this update.

Summary

CVE-2023-36899 - .NET Framework Remote Code Execution Vulnerability This security update addresses a vulnerability in applications on IIS using their parent application’s Application Pool which can lead to privilege escalation or other security bypasses. For more information see CVE 2023-36899.

CVE-2023-36873 - .NET Framework Spoofing Vulnerability This security update addresses a vulnerability where unauthenticated remote attacker can sign ClickOnce deployments without a valid code signing certificate. For more information see CVE-2023-36873.

Additional information about this update

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

  • 5029568 Description of the Security Only Update for .NET Framework 3.5, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows Server 2012 R2 (KB5029568)

Known issues in this update

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

How to get this 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

No

See the other options below.

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.

Restart requirement

You may need to 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:

20230808 Security update deployment information: August 8, 2023

File Information

File hash information

File name

SHA256 hash

Windows8.1-KB5028974-x64.msu

EDC1984BF1B5A16CAFF6871CD6C9FEE679D780382E56F1285D8BB440F7F460A5

File name

File version

File size

Date

Time

Platform

SP requirement

Service branch

Aspnet_perf.dll

4.8.4654.0

42,888

04-Jul-2023

02:26

x64

SPN

AMD64_NETFX4-ASP

Aspnet_state_perf.h

Not applicable

318

04-Jul-2023

00:39

Not applicable

SPN

AMD64_NETFX4-ASP

Aspnet_state_perf.ini

Not applicable

42,996

04-Jul-2023

02:27

Not applicable

SPN

AMD64_NETFX4-ASP

Aspnet_wp.exe

4.8.4654.0

46,480

04-Jul-2023

02:26

x64

SPN

AMD64_NETFX4-ASP

Dfdll.dll

4.8.4654.0

215,944

04-Jul-2023

02:26

x64

None

Not applicable

System.deployment.dll

4.8.4654.0

1,596,304

04-Jul-2023

02:35

x86

None

Not applicable

System.web.applicationservices.dll

4.8.4654.0

65,904

04-Jul-2023

02:35

x86

None

Not applicable

System.web.extensions.dll

4.8.4654.0

1,844,592

04-Jul-2023

02:35

x86

None

Not applicable

System.windows.forms.dll

4.8.4654.0

5,922,672

04-Jul-2023

02:35

x86

None

Not applicable

Webengine4.dll

4.8.4654.0

676,232

04-Jul-2023

02:26

x64

None

Not applicable

Webengine.dll

4.8.4654.0

22,408

04-Jul-2023

02:26

x64

None

Not applicable

System.web.dll

4.8.4654.0

5,399,448

04-Jul-2023

02:26

x64

None

Not applicable

System.deployment.dll

4.8.4654.0

1,596,304

04-Jul-2023

02:35

x86

None

Not applicable

System.web.applicationservices.dll

4.8.4654.0

65,904

04-Jul-2023

02:35

x86

None

Not applicable

System.web.extensions.dll

4.8.4654.0

1,844,592

04-Jul-2023

02:35

x86

None

Not applicable

System.windows.forms.dll

4.8.4654.0

5,922,672

04-Jul-2023

02:35

x86

None

Not applicable

Aspnet_perf.dll

4.8.4654.0

37,256

04-Jul-2023

02:27

x86

SPN

X86_NETFX4-ASP

Aspnet_state_perf.h

Not applicable

318

04-Jul-2023

00:42

Not applicable

SPN

X86_NETFX4-ASP

Aspnet_state_perf.ini

Not applicable

42,996

04-Jul-2023

02:29

Not applicable

SPN

X86_NETFX4-ASP

Aspnet_wp.exe

4.8.4654.0

40,888

04-Jul-2023

02:27

x86

SPN

X86_NETFX4-ASP

Dfdll.dll

4.8.4654.0

179,080

04-Jul-2023

02:27

x86

None

Not applicable

System.web.extensions.dll

4.8.4654.0

1,844,592

04-Jul-2023

02:35

x86

None

Not applicable

Webengine4.dll

4.8.4654.0

565,656

04-Jul-2023

02:27

x86

None

Not applicable

Webengine.dll

4.8.4654.0

20,376

04-Jul-2023

02:27

x86

None

Not applicable

System.web.dll

4.8.4654.0

5,412,280

04-Jul-2023

02:35

x86

None

Not applicable

How to obtain help and support for this update

Need more help?

Want more options?

Explore subscription benefits, browse training courses, learn how to secure your device, and more.

Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.