Description of the security update for the .NET Framework 4.6 and 4.6.1 for Windows Server 2012: April 11, 2017

Applies to: .NET Framework 4.6.1.NET Framework 4.6

Note


Known issues in this security update

Summary


This update resolves a vulnerability in the Microsoft .NET Framework that could allow remote code execution when the .NET Framework fails to properly validate input before loading libraries. An attacker who successfully exploits this vulnerability could take control of an affected system. The attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. To learn more about this vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2017-0160.

Important

  • 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 any Windows Management Instrumentation (WMI) applications returning the following error message:

    Get-WmiObject: The method or operation is not implemented.

    To temporarily disable this update, customers can apply the following registry entry to their system.

    Warning Enabling this registry entry could allow security vulnerabilities including Remote Code Execution.

    Registry entry
    • For 32-bit process on 32-bit system and 64-bit process on 64-bit system:
      HKEY_LOCAL_MACHINE\Software\Microsoft\.NETFramework\v4.0.30319@WMIDisableCOMSecurity=1
    • For 32-bit process on 64-bit system:
      HKEY_LOCAL_MACHINE \Software\Wow6432Node\Microsoft\.NETFramework\v4.0.30319@WMIDisableCOMSecurity=1
    Notes
    • This registry entry should be a DWORD entry.

    • This registry entry restores the previous unsecured state.

  • For more information about this security update as it relates to Windows Server 2012, see the following article in the Microsoft Knowledge Base:
    4014986 Security Only update for the .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, and 4.6.2 updates for Windows Server 2012: April 11, 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 will open a browser window in which you may be prompted to install an ActiveX control. You must install the ActiveX control to continue.
  5. Once the control is installed, you will see the Microsoft Update Catalog screen. Enter 4014986 in 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. When you have selected all the packages you need, click View Basket.
  8. Click Import to import the packages to your WSUS server.
  9. Click Close once the packages have been imported to return to WSUS.

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:

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 attributes

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

How to obtain help and support for this security update


Applies to


This article applies to the following:
  • Microsoft .NET Framework 4.6 and 4.6.1 when used with:
    • Windows Server 2012