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Summary

This security update resolves a vulnerability in the Microsoft .NET Framework that could allow remote code execution when Microsoft .NET Framework processes untrusted input. An attacker who successfully exploits this vulnerability in software by using the .NET Framework could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts that have full user rights. Users whose accounts are configured to have fewer user rights on the system could be less affected than users who operate by using administrative user rights.

To exploit the vulnerability, an attacker must first convince the user to open a malicious document or application.

This security update addresses the vulnerability by correcting how the .NET Framework validates untrusted input. To learn more about this vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2017-8759.

Important

  • All updates for .NET Framework 4.6, 4.6.1, 4.6.2, and 4.7 require the d3dcompiler_47.dll update to be 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 update, 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 security update

For more information about this security update as it relates to Windows Server 2012, see the following article in the Microsoft Knowledge Base:

4041091 Security Only update for the .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2, and 4.7 updates for Windows Server 2012: September 12, 2017

How to obtain and install the update

Method 1: Microsoft Update Catalog

To get the stand-alone package for this update, go to the Microsoft Update Catalog.
 

Method 2: Windows Software Update Services (WSUS)

On your WSUS server, follow these steps:

  1. Click Start, click Administrative Tools, and then click Microsoft Windows Server Update Services 3.0.

  2. Expand ComputerName, and then click Action.

  3. Click Import Updates.

  4. WSUS opens a browser window in which you may be prompted to install an ActiveX control. You must install the ActiveX control to continue.

  5. After the control is installed, you see the Microsoft Update Catalog screen. Enter 4041091 into the Search box, and then click Search.

  6. Locate the .NET Framework packages that match the operating systems, languages, and processors in your environment. Click Add to add them to your basket.

  7. After you select all the packages that you need, click View Basket.

  8. Click Import to import the packages to your WSUS server.

  9. To return to WSUS, click Close after the packages have been imported.

The updates are now available for installation through WSUS.

Update deployment information

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

20170912 Security update deployment information: September 12, 2017

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.

Update replacement information

This update does not replace any previously released update.

 

File information

File hash

Package Name

Package Hash SHA 1

Package Hash SHA 2

Windows8-RT-KB4040955-x86.msu

0E2ED18AB10CFA85AEDA0578225011843D1A294E

D42F12B6C238256686DC5EAEA6649357C8092D3AB8FEA3867128B3B50A4C666F

Windows8-RT-KB4040955-x64.msu

15DD4C5FCB6FA46B5F8EF0B4DA0C316EC6E78EAA

7FCEDD935E98F4C0C3858EA49854FA26992E6520326E3FC9E26584D8003F9CD9


File attributes

The English (United States) version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

For all x86-based systems

File name

File version

File size

Date

Time

system.runtime.remoting.dll

4.7.2114.0

347,368

30-Aug-2017

06:04

For all x64-based systems

File name

File version

File size

Date

Time

system.runtime.remoting.dll

4.7.2114.0

347,368

30-Aug-2017

06:04

system.runtime.remoting.dll

4.7.2114.0

347,368

30-Aug-2017

06:04

How to obtain help and support for this security update

Applies to

This article applies to the following:

 

  • Microsoft .NET Framework 4.6, 4.6.1, 4.6.2, and 4.7 when used with:

    • Windows Server 2012

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