Summary

This security update resolves a vulnerability in Microsoft Windows. The vulnerability could allow security feature bypass if an attacker installs an affected boot manager and bypasses Windows security features.

To learn more about the vulnerability, see Microsoft Security Bulletin MS16-100.

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.

  • 3172729 MS16-100: Description of the security update for Secure Boot: August 9, 2016


    Known issues in security update 3172729:

    • When you try to install this security update, you may receive an error message that resembles the following:


      The update is not applicable to your computer

    • If you are running Windows 10 Version 1607 (Anniversary Edition), the Hyper-V firmware will already have the TP5 boot manager blacklisted.

    For more information about these issues, see KB 3172729

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 Update Catalog

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

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 MS16-100 that corresponds to the version of Windows that you are running.

More Information

Windows 10 (all editions)Reference table

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


Security update file name

For all supported 32-bit editions of Windows 10:
Windows10.0-KB3172729-x86.msu

For all supported x64-based editions of Windows 10:
Windows10.0-KB3172729-x64.msu

For all supported 32-bit editions of Windows 10 Version 1511:
Windows10.0-Kb3172729-x86.msu

For all supported x64-based editions of Windows 10 Version 1511:
Windows10.0-Kb3172729-x64.msu

Installation switches

See Microsoft Knowledge Base article 934307

Restart requirement

A system restart is required after you apply this security update.

Removal information

To 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 information

See Microsoft Knowledge Base article 3172729

Registry key verification

Note A registry key does not exist to validate the presence of this update.



Windows 8.1 (all editions)Reference table

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

Security update file name

For all supported 32-bit editions of Windows 8.1:
Windows8.1-KB3172729-x86.msu

For all supported x64-based editions of Windows 8.1:
Windows8.1-KB3172729-x64.msu

Installation switches

See Microsoft Knowledge Base article 934307

Restart requirement

A system restart is not required after you apply this security update.

Removal information

To 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 information

See Microsoft Knowledge Base article 3172729

Registry key verification

Note 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.


Deployment

The 3172729 update is available via Windows Update only.

Restart Requirement

A system restart is not required after you apply this security update.

Removal Information

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 Information

See Microsoft Knowledge Base article 3172729



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 name

For all supported editions of Windows Server 2012:
Windows8-RT-KB3172729-x64.msu

For all supported editions of Windows Server 2012 R2:
Windows8.1-KB3172729-x64.msu

Installation switches

See Microsoft Knowledge Base article 934307

Restart requirement

A system restart is not required after you apply this security update.

Removal information

To 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 information

See Microsoft Knowledge Base article 3172729

Registry key verification

Note There is no registry key to validate the presence of this 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

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