MS15-122: Security update for Kerberos to address security feature bypass: November 10, 2015

Applies to: Windows 10Windows Server 2012 R2 DatacenterWindows Server 2012 R2 Standard More

Summary


This security update resolves a security feature bypass in Microsoft Windows. An attacker could bypass Kerberos authentication on a computer and decrypt drives that have BitLocker enabled. The bypass can be exploited only if the computer has BitLocker enabled without a PIN or USB key, the computer is domain joined, and the attacker has physical access to the computer.

To learn more about the vulnerability, see Microsoft Security Bulletin MS15-122.

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Important
  • All future security and nonsecurity 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.

More information about this security update


The following articles contain more information about this security update as it relates to individual product versions. The articles may contain known issue information.
  • 3101246 MS15-122: Description of the security update for Windows Kerberos: November 10, 2015
  • 3105213 Cumulative update for Windows 10: November 10, 2015
  • 3105211 Cumulative update for Windows 10 Version 1511: November 10, 2015

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

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