Applies to:

Microsoft .NET Framework 3.5

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).

A remote code execution vulnerability exists when Microsoft .NET Framework processes input. An attacker who successfully exploited this vulnerability could take control of an affected system. To exploit the vulnerability, an attacker would need to be able to upload a specially crafted file to a web application. The security update addresses the vulnerability by correcting how .NET Framework processes input.

For more information go to: https://go.microsoft.com/fwlink/?linkid=2138023

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

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 3.5 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 3.5 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-KB4569734-x64.msu

E87D23055253C0A2E8D4B83CC20DE9A7093CE40C

C08485E7B22C297EC402B508519EC783F44A5167AD522DC5711477F0DDEC5E2E

For all supported x64-based versions

File name

File version

File size

Date

Time

Platform

SP requirement

Service branch

Aspnet_wp.exe

2.0.50727.8951

45,456

01-Jul-2020

13:06

x64

SPN

AMD64_NETFX-ASP

System.web.regularexpressions.dll

2.0.50727.8951

98,304

01-Jul-2020

13:06

x86

None

Not applicable

Webengine.dll

2.0.50727.8951

748,936

01-Jul-2020

13:06

x64

None

Not applicable

System.web.dll

2.0.50727.8951

5,300,224

01-Jul-2020

13:06

x64

None

Not applicable

System.web.regularexpressions.dll

2.0.50727.8951

98,304

01-Jul-2020

13:06

x86

None

Not applicable

Aspnet_wp.exe

2.0.50727.8951

33,680

01-Jul-2020

13:06

x86

SPN

X86_NETFX-ASP

Webengine.dll

2.0.50727.8951

439,680

01-Jul-2020

13:06

x86

None

Not applicable

System.web.dll

2.0.50727.8951

5,292,032

01-Jul-2020

13:06

x86

None

Not applicable

Information about protection and security

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