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.
More Information
Important
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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.
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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.
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.
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 MS15-122 that corresponds to the version of Windows that you are running.
More Information
Windows Vista (all editions)
Reference table
The following table contains the security update information for this software.
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Security update file names |
For all supported 32-bit editions of Windows Vista: |
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For all supported x64-based editions of Windows Vista: |
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Installation switches |
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Restart requirement |
A system restart is required after you apply this security update. |
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Removal information |
WUSA.exe does not support uninstall of updates. To uninstall an update that is installed by WUSA, click Control Panel, and then click Security. Under Windows Update, click View installed updates, and then select from the list of updates. |
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File information |
|
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Registry key verification |
Note A registry key does not exist to validate the presence of this update. |
Windows Server 2008 (all editions)
Reference table
The following table contains the security update information for this software.
|
Security update file names |
For all supported 32-bit editions of Windows Server 2008: |
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For all supported x64-based editions of Windows Server 2008: |
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For all supported Itanium-based editions of Windows Server 2008: |
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Installation switches |
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Restart requirement |
A system restart is required after you apply this security update. |
|
Removal information |
WUSA.exe does not support uninstall of updates. To uninstall an update that is installed by WUSA, click Control Panel, and then click Security. Under Windows Update, click View installed updates, and then select from the list of updates. |
|
File information |
|
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Registry key verification |
Note A registry key does not exist to validate the presence of this update. |
Windows 7 (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 7: |
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For all supported x64-based editions of Windows 7: |
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Installation switches |
|
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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, and then click System and Security. Under Windows Update, click View installed updates, and then select from the list of updates. |
|
File information |
|
|
Registry key verification |
Note A registry key does not exist to validate the presence of this update. |
Windows Server 2008 R2 (all editions)
Reference table
The following table contains the security update information for this software.
|
Security update file name |
For all supported x64-based editions of Windows Server 2008 R2: |
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For all supported Itanium-based editions of Windows Server 2008 R2: |
|
Installation switches |
|
|
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, and then click System and Security. Under Windows Update, click View installed updates, and then select from the list of updates. |
|
File information |
|
|
Registry key verification |
Note A registry key does not exist to validate the presence of this update. |
Windows 8 and 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: |
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For all supported x64-based editions of Windows 8: |
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For all supported 32-bit editions of Windows 8.1: |
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For all supported x64-based editions of Windows 8.1: |
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Installation switches |
|
|
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 |
|
|
Registry key verification |
Note A registry key does not exist 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 name |
For all supported editions of Windows Server 2012: |
|
|
For all supported editions of Windows Server 2012 R2: |
|
Installation switches |
|
|
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 |
|
|
Registry key verification |
Note A registry key does not exist to validate the presence of this update. |
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: |
|
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For all supported x64-based editions of Windows 10: |
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For all supported 32-bit editions of Windows 10 Version 1511: |
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For all supported x64-based editions of Windows 10 Version 1511: |
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Installation switches |
|
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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 |
|
|
Registry key verification |
Note A registry key does not exist to validate the presence of this update. |
|
Package Name |
Package Hash SHA 1 |
Package Hash SHA 2 |
|---|---|---|
|
Windows6.1-KB3101246-x86.msu |
8DBBFF07ACFD2527E11278C5244FFFB3A5AB98D2 |
51EB2BC6E50939F0EF629EDE02F9EA7B94FB3DF0BECF258011B26F5FFB060AA5 |
|
Windows6.1-KB3101246-x64.msu |
DD54CDBAE8A78634F7811D532BB33B7651D8BCA0 |
BB033BB00FE625BD14E051E5781DB531FC8DDE4E4AE1A8BE60769274C7C207E2 |
|
Windows8-RT-KB3101246-x86.msu |
029C4F3EEB37C6C3F23EB4759A25D961B1412072 |
190DF15FFB4882897009043C87D913D965E045ADF34E0EBAE0DF7F82C9BD51F2 |
|
Windows8-RT-KB3101246-x64.msu |
471AE473E52E44F080B8F10A4D9A419619EA04B0 |
C4FD66EB48CEB202EF464978DC5E2EA9E7A2B683C2C9BF987A8CFA9B1C950483 |
|
Windows8.1-KB3101246-x86.msu |
78B558E3B8D6BDD3B51266AB35A2821FCE96AEA6 |
E0B9B83E78A0E1561FC9E85E7E1F567269DA8CB59C46064E090F904EC697FF5D |
|
Windows8.1-KB3101246-x64.msu |
7C07350E0AAB83DD9DE6EE64404CD87AC3787B69 |
6E25F6AB83604AEC497D3BCB38705E196A93D7BC10E27ED491D7DD04236B434C |
|
Windows8-RT-KB3101246-arm.msu |
E2A8ABB2CFC35641B6FFECBD9C2D6185B72D36CA |
B3EF599DDEAF261EBA624895C46438B67AB21E8C55005D678B78B31A070CC295 |
|
Windows8.1-KB3101246-arm.msu |
BD94F5C9A9C630510ED61902873A550ABD284D69 |
E412D04C3E639D00264D8410E9B0884CA6F324639E8DA9F99DD6F78C6B3F0637 |
|
Windows6.0-KB3101246-x86.msu |
20B408C5A33759B02342F0BA608D320938B5DC87 |
454D38872FEB4B308A9AAF3CC74525C55394CF0453B2B58AC88853AB3FA4E4D5 |
|
Windows6.0-KB3101246-x86.msu |
20B408C5A33759B02342F0BA608D320938B5DC87 |
454D38872FEB4B308A9AAF3CC74525C55394CF0453B2B58AC88853AB3FA4E4D5 |
|
Windows6.0-KB3101246-ia64.msu |
38B1C93A2D2BF3F271719F48EF672AF29EF89B9C |
4713B645576D6EC3168307AB7AA036F8BE2008C9185BFBB3CC4A528C48553BA6 |
|
Windows6.0-KB3101246-x64.msu |
ABF282EAADA0775D26BC4D789A1EE431EC40B917 |
BFB736C090C7D31F895808920A2D488C19C0F362993606941CD07C63D16F6D38 |
|
Windows6.0-KB3101246-x64.msu |
ABF282EAADA0775D26BC4D789A1EE431EC40B917 |
BFB736C090C7D31F895808920A2D488C19C0F362993606941CD07C63D16F6D38 |
|
Windows6.1-KB3101246-ia64.msu |
45A5B90000D364B2B8CB60305A57F7327FFB62CC |
CCB92A571D1B70E5FD684FF9E2426F1A7E7DADD7B5259ACEF07D608F51CC9459 |
|
Windows6.1-KB3101246-x64.msu |
DD54CDBAE8A78634F7811D532BB33B7651D8BCA0 |
BB033BB00FE625BD14E051E5781DB531FC8DDE4E4AE1A8BE60769274C7C207E2 |
|
Windows6.1-KB3101246-x64.msu |
DD54CDBAE8A78634F7811D532BB33B7651D8BCA0 |
BB033BB00FE625BD14E051E5781DB531FC8DDE4E4AE1A8BE60769274C7C207E2 |
|
Windows8-RT-KB3101246-x64.msu |
471AE473E52E44F080B8F10A4D9A419619EA04B0 |
C4FD66EB48CEB202EF464978DC5E2EA9E7A2B683C2C9BF987A8CFA9B1C950483 |
|
Windows8-RT-KB3101246-x64.msu |
471AE473E52E44F080B8F10A4D9A419619EA04B0 |
C4FD66EB48CEB202EF464978DC5E2EA9E7A2B683C2C9BF987A8CFA9B1C950483 |
|
Windows8.1-KB3101246-x64.msu |
7C07350E0AAB83DD9DE6EE64404CD87AC3787B69 |
6E25F6AB83604AEC497D3BCB38705E196A93D7BC10E27ED491D7DD04236B434C |
|
Windows8.1-KB3101246-x64.msu |
7C07350E0AAB83DD9DE6EE64404CD87AC3787B69 |
6E25F6AB83604AEC497D3BCB38705E196A93D7BC10E27ED491D7DD04236B434C |
|
Windows6.0-KB3101246-x86.msu |
20B408C5A33759B02342F0BA608D320938B5DC87 |
454D38872FEB4B308A9AAF3CC74525C55394CF0453B2B58AC88853AB3FA4E4D5 |
|
Windows6.0-KB3101246-x64.msu |
ABF282EAADA0775D26BC4D789A1EE431EC40B917 |
BFB736C090C7D31F895808920A2D488C19C0F362993606941CD07C63D16F6D38 |
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
