Security Only Update for .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2 for Windows Server 2012 (KB4569738)

Summary

Security improvements

An elevation of privilege vulnerability exists when ASP.NET or .NET Framework web applications running on IIS improperly allow access to cached files. An attacker who successfully exploited this vulnerability could gain access to restricted files. To exploit this vulnerability, an attacker would need to send a specially crafted request to an affected server. The update addresses the vulnerability by changing how ASP.NET and .NET Framework handle requests.

To learn more about the vulnerabilities, go to the following Common Vulnerabilities and Exposures (CVE).

CVE-2020-1476

Important

All updates for .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, and 4.7.2 require that the d3dcompiler_47.dll update is installed. We recommend that you install the included d3dcompiler_47.dll update before you apply this update. For more information about the d3dcompiler_47.dll, see KB 4019990.
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.

Additional information about this update

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

4570501 Description of the Security Only Update 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 (KB4570501)

How to obtain and install the update

Before installing this update

Prerequisite:

To apply this update, you must have .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2 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 Server 2012

Classification: Security Updates

Prerequisites

To apply this update, you must have .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2 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:

20200811 Security update deployment information: August 11, 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 Server 2012 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-RT-KB4569738-x64.msu	B117C4072D75AE8BED02532577CFE8763BF34930	E57E2784054117B9653D83158E54915431FFEC8A7D53E86F58B0C6B78F25AD84

For all supported x64-based versions

File name	File version	File size	Date	Time	Platform	SP requirement	Service branch
Aspnet_perf.dll	4.7.3650.0	39,304	30-Jun-2020	01:02	x64	SPN	AMD64_NETFX4-ASP
Aspnet_state_perf.h	Not applicable	318	29-Jun-2020	22:15	Not applicable	SPN	AMD64_NETFX4-ASP
Aspnet_state_perf.ini	Not applicable	42,996	30-Jun-2020	01:02	Not applicable	SPN	AMD64_NETFX4-ASP
Aspnet_wp.exe	4.7.3650.0	43,920	30-Jun-2020	01:02	x64	SPN	AMD64_NETFX4-ASP
Msvcp120_clr0400.dll	12.0.52519.0	690,008	11-Jun-2020	23:36	x64	None	Not applicable
Msvcr120_clr0400.dll	12.0.52519.0	993,632	11-Jun-2020	23:36	x64	None	Not applicable
System.web.applicationservices.dll	4.7.3650.0	63,768	30-Jun-2020	01:11	x86	None	Not applicable
System.web.extensions.dll	4.7.3650.0	1,842,968	30-Jun-2020	01:11	x86	None	Not applicable
Webengine4.dll	4.7.3650.0	660,352	30-Jun-2020	01:02	x64	None	Not applicable
Webengine.dll	4.7.3650.0	19,328	30-Jun-2020	01:02	x64	None	Not applicable
System.web.dll	4.7.3650.0	5,392,256	30-Jun-2020	01:02	x64	None	Not applicable
System.web.applicationservices.dll	4.7.3650.0	63,768	30-Jun-2020	01:11	x86	None	Not applicable
System.web.extensions.dll	4.7.3650.0	1,842,968	30-Jun-2020	01:11	x86	None	Not applicable
Aspnet_perf.dll	4.7.3650.0	35,720	30-Jun-2020	01:11	x86	SPN	X86_NETFX4-ASP
Aspnet_state_perf.h	Not applicable	318	29-Jun-2020	22:28	Not applicable	SPN	X86_NETFX4-ASP
Aspnet_state_perf.ini	Not applicable	42,996	30-Jun-2020	01:12	Not applicable	SPN	X86_NETFX4-ASP
Aspnet_wp.exe	4.7.3650.0	39,304	30-Jun-2020	01:11	x86	SPN	X86_NETFX4-ASP
Msvcp120_clr0400.dll	12.0.52519.0	485,576	11-Jun-2020	23:36	x86	None	Not applicable
Msvcr120_clr0400.dll	12.0.52519.0	987,840	11-Jun-2020	23:36	x86	None	Not applicable
System.web.extensions.dll	4.7.3650.0	1,842,968	30-Jun-2020	01:11	x86	None	Not applicable
Webengine4.dll	4.7.3650.0	543,112	30-Jun-2020	01:11	x86	None	Not applicable
Webengine.dll	4.7.3650.0	17,792	30-Jun-2020	01:11	x86	None	Not applicable
System.web.dll	4.7.3650.0	5,409,160	30-Jun-2020	01:11	x86	None	Not applicable

Information about protection and security

Protect yourself online: Windows Security support
Learn how we guard against cyber threats: Microsoft Security