Summary
This security update resolves vulnerabilities in Microsoft Windows. The vulnerabilities could allow elevation of privilege if the Web Proxy Auto Discovery (WPAD) protocol falls back to a vulnerable proxy discovery process on a target system. To learn more about the vulnerability, see Microsoft Security Bulletin MS16-077.
More Information
Important
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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.
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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.
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This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756How to back up and restore the registry in Windows
Note You must restart the computer after you make any of the registry changes described in the following section in order for the changes to take effect.
Behavior changes after installation
After you install this security update, the following changes are applied:
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The computer does not respond to NetBIOS name resolution requests from IP addresses that are not on the same subnet.
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The computer does not respond to nbtstat -a or nbtstat -A requests from IP addresses that are not on the same subnet.
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NETBIOS communication outside of the local subnet is hardened. Therefore, by default, some features that depend on NETBIOS (such as SMB over NETBIOS) will not work outside the local subnet. To change this new default behavior, create the following registry entry:
SUBKEY: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NetBT\ParametersValue Name: AllowNBToInternetType: DwordValue: 1Default value of the flag: 0
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By default, WPAD resolution for auto proxy detection will not use NETBIOS. Therefore, if proxy detection depends on NETBIOS alone for WPAD resolution, it may fail. We recommend that you use the DHCP option or DNS for WPAD resolution instead of NETBIOS. To change this new default behavior, create the following registry entry.Note This registry entry only applies for Windows 8.1 and earlier versions of Windows.
SUBKEY: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttpValue Name: AllowOnlyDNSQueryForWPADType: DWORDValue: 0 Default value of the flag: 1
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The default behavior of PAC file download is changed so that the client's domain credentials are not automatically sent in response to an NTLM or Negotiate Authentication challenge when WinHTTP requests the PAC file. This occurs regardless of the value of the fAutoLogonIfChallenged flag that is specified in WINHTTP_AUTOPROXY_OPTIONS. To change this new default behavior, create both of the following registry entries:Â
SUBKEY: HKEY_LOCAL_MACHINE\SOFTWARE\WoW6432Node\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttpValue Name: AutoProxyAutoLogonIfChallengedType: DWORDValue: 1Default value of the flag: 0
SUBKEY: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttpValue Name: AutoProxyAutoLogonIfChallengedType: DWORDValue: 1Default value of the flag: 0
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.
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, seeGet security updates automatically. Note For 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 MS16-077 that corresponds to the version of Windows that you are running.
More Information
Windows Vista (all editions)Reference TableThe 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:Windows6.0-KB3161949-x86.msu |
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For all supported x64-based editions of Windows Vista:Windows6.0-KB3161949-x64.msu |
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Installation switches |
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Restart requirement |
You must restart the system after you apply this security update. |
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Removal information |
To uninstall an update that is installed by WUSA, use the /Uninstall setup switch or click Control Panel, click System and Security, click Windows Update, click Installed updates under See also, and then select from the list of updates. |
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File information |
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Registry key verification |
Note There is no registry key to validate the presence of this update. |
Windows Server 2008 (all editions)Reference TableThe 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 Server 2008:Windows6.0-KB3161949-x86.msu |
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For all supported x64-based editions of Windows Server 2008:Windows6.0-KB3161949-x64.msu |
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For all supported Itanium-based editions of Windows Server 2008:Windows6.0-KB3161949-ia64.msu |
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Installation switches |
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Restart requirement |
You must restart the system after you apply this security update. |
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Removal information |
To uninstall an update that is installed by WUSA, use the /Uninstall setup switch or click Control Panel, click System and Security, click Windows Update, click Installed updates under See also, and then select from the list of updates. |
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File information |
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Registry key verification |
Note There is no registry key to validate the presence of this update. |
Windows 7 (all editions)Reference TableThe following table contains the security update information for this software.
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Security update file name |
For all supported 32-bit editions of Windows 7:Windows6.1-KB3161949-x86.msu |
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For all supported x64-based editions of Windows 7:Windows6.1-KB3161949-x64.msu |
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Installation switches |
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Restart requirement |
You must restart the system after you apply this security update. |
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Removal information |
To uninstall an update that is installed by WUSA, use the /Uninstall setup switch or click Control Panel, click System and Security, click Windows Update, click Installed updates under See also, and then select from the list of updates. |
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File information |
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Registry key verification |
Note There is no registry key to validate the presence of this update. |
Windows Server 2008 R2 (all editions)Reference TableThe following table contains the security update information for this software.
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Security update file name |
For all supported x64-based editions of Windows Server 2008 R2:Windows6.1-KB3161949-x64.msu |
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For all supported Itanium-based editions of Windows Server 2008 R2:Windows6.1-KB3161949-ia64.msu |
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Installation switches |
|
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Restart requirement |
You must restart the system 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, click Windows Update, click Installed updates under See also, and then select from the list of updates. |
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File information |
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Registry key verification |
Note There is no registry key to validate the presence of this update. |
Windows 8.1 (all editions)Reference TableThe following table contains the security update information for this software.
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Security update file name |
For all supported 32-bit editions of Windows 8.1:Windows8.1-KB3161949-x86.msu |
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For all supported x64-based editions of Windows 8.1:Windows8.1-KB3161949-x64.msu |
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Installation switches |
|
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Restart requirement |
You must restart the system 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, click Windows Update, click Installed updates under See also, and then select from the list of updates. |
|
File information |
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Registry key verification |
Note There is no registry key to validate the presence of this update. |
Windows Server 2012 and Windows Server 2012 R2 (all editions) Reference TableThe following table contains the security update information for this software.
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Security update file name |
For all supported editions of Windows Server 2012:Windows8-RT-KB3161949-x64.msu |
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For all supported editions of Windows Server 2012 R2:Windows8.1-KB3161949-x64.msu |
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Installation switches |
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Restart requirement |
You must restart the system 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, click Windows Update, click Installed updates under See also, and then select from the list of updates. |
|
File information |
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Registry key verification |
Note There is no registry key to validate the presence of this update. |
Windows RT 8.1 (all editions) Reference TableThe following table contains the security update information for this software.
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Deployment |
These updates are available via Windows Update only. |
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Restart Requirement |
You must restart the system after you apply this security update. |
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Removal Information |
Click Control Panel, click System and Security, click Windows Update, click Installed updates under See also, and then select from the list of updates. |
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File Information |
Windows 10 (all editions) Reference TableThe following table contains the security update information for this software.
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Security update file name |
For all supported 32-bit editions of Windows 10:Windows10.0-KB3163017-x86.msu |
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For all supported x64-based editions of Windows 10:Windows10.0-KB3163017-x64.msu |
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For all supported 32-bit editions of Windows 10 Version 1511:Windows10.0-KB3163018-x86.msu |
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For all supported x64-based editions of Windows 10 Version 1511:Windows10.0-KB3163018-x64.msu |
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Installation switches |
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Restart requirement |
You must restart the system 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, click Windows Update, click Installed updates under See also, and then select from the list of updates. |
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File information |
See Microsoft Knowledge Base article 3163017See Microsoft Knowledge Base article 3163018 |
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Registry key verification |
Note There is no registry key to validate the presence of this update. |
Help for installing updates: Support for Microsoft UpdateSecurity solutions for IT professionals: TechNet Security Troubleshooting and SupportHelp for protecting your Windows-based computer from viruses and malware: Virus Solution and Security CenterLocal support according to your country: International Support
