MS16-094: Security update for Secure Boot: July 12, 2016

Summary
This security update resolves a vulnerability in Microsoft Windows. The vulnerability could allow Secure Boot security features to be bypassed if an attacker installs an affected policy on a target device. An attacker must have either administrative privileges or physical access to install a policy and bypass Secure Boot.

To learn more about the vulnerability, see Microsoft Security Bulletin MS16-094.
More information
Important

  • All future security and non-security updates for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 require update 2919355 to be installed. We recommend that you install update 2919355 on your Windows RT 8.1-based, Windows 8.1-based, or Windows Server 2012 R2-based computer so that you receive future updates.
  • 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
The following articles contain additional information about this security update as it relates to individual product versions. The articles may contain known issue information.

  • 3172727 MS16-094: Description of the security update for secure boot: July 12, 2016
  • 3163912 Cumulative update for Windows 10: July 12, 2016
  • 3172985 Cumulative update for Windows 10 Version 1511 and Windows Server 2016 Technical Preview 4: July 12, 2016
How to obtain and install the update

Method 1: Windows Update

This update is available through Windows Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to turn on automatic updating, see Get security updates automatically.

Note For Windows RT 8.1, this update is available through Windows Update only.

Method 2: Microsoft Download Center

You can obtain the stand-alone update package through the Microsoft Download Center. Follow the installation instructions on the download page to install the update.

Click the download link in Microsoft Security Bulletin MS16-094 that corresponds to the version of Windows that you are running.
More information

Security update deployment information

Windows 8.1 (all editions)

Reference table

The following table contains the security update information for this software.
Security update file nameFor all supported 32-bit editions of Windows 8.1:
Windows8.1-KB3172727-x86.msu
For all supported x64-based editions of Windows 8.1:
Windows8.1-KB3172727-x64.msu
Installation switchesSee Microsoft Knowledge Base article 934307
Restart requirementYou must restart the system after you apply this security update.
Removal informationTo uninstall an update that is installed by WUSA, use the /Uninstall setup switch or Click Control Panel, click System and Security, and then click Windows Update. Under See also, click Installed updates, and then select from the list of updates.
File informationSee Microsoft Knowledge Base article 3172727
Registry key verificationNote There is no registry key to validate the presence of this update.

Windows Server 2012 and Windows Server 2012 R2 (all editions)

Reference table

The following table contains the security update information for this software.

Security update file nameFor all supported editions of Windows Server 2012:
Windows8-RT-KB3172727-x64.msu
For all supported editions of Windows Server 2012 R2:
Windows8.1-KB3172727-x64.msu
Installation switchesSee Microsoft Knowledge Base article 934307
Restart requirementYou must restart the system after you apply this security update.
Removal informationTo uninstall an update that is installed by WUSA, use the /Uninstall setup switch or Click Control Panel, click System and Security, and then click Windows Update. Under See also, click Installed updates, and then select from the list of updates.
File informationSee Microsoft Knowledge Base article 3172727
Registry key verificationNote There is no registry key to validate the presence of this update.

Windows RT 8.1 (all editions)

Reference table

The following table contains the security update information for this software.

DeploymentThese updates are available via Windows Update only.
Restart RequirementYou must restart the system after you apply this security update.
Removal InformationClick Control Panel, click System and Security, and then click Windows Update. Under See also, click Installed updates, and then select from the list of updates.
File InformationSee Microsoft Knowledge Base Article 3172727

Windows 10 (all editions)

Reference table

The following table contains the security update information for this software.

Security update file nameFor all supported 32-bit editions of Windows 10:
Windows10.0-KB3163912-x86.msu

For all supported x64-based editions of Windows 10:
Windows10.0-KB3163912-x64.msu

For all supported 32-bit editions of Windows 10 Version 1511:
Windows10.0-KB3172985 -x86.msu

For all supported x64-based editions of Windows 10 Version 1511:
Windows10.0-KB3172985 -x64.msu
Installation switchesSee Microsoft Knowledge Base article 934307
Restart requirementYou must restart the system after you apply this security update.
Removal informationTo uninstall an update that is installed by WUSA, use the /Uninstall setup switch or Click Control Panel, click System and Security, and then click Windows Update. Under See also, click Installed updates, and then select from the list of updates.
File informationSee Microsoft Knowledge Base article 3163912
See Microsoft Knowledge Base article 3172985 
Registry key verificationNote There is no registry key to validate the presence of this update.

How to obtain help and support for this security update

Help for installing updates: Support for Microsoft Update

Security solutions for IT professionals: TechNet Security Troubleshooting and Support

Help for protecting your Windows-based computer from viruses and malware: Virus Solution and Security Center

Local support according to your country: International Support
malicious attacker exploit
Properties

Article ID: 3177404 - Last Review: 07/12/2016 19:15:00 - Revision: 1.1

Windows 10, Windows 10 Version 1511, Windows Server 2012 R2 Datacenter, Windows Server 2012 R2 Standard, Windows Server 2012 R2 Essentials, Windows Server 2012 R2 Foundation, Windows 8.1 Enterprise, Windows 8.1 Pro, Windows 8.1, Windows RT 8.1, Windows Server 2012 Datacenter, Windows Server 2012 Standard, Windows Server 2012 Essentials, Windows Server 2012 Foundation

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