Article ID: 2887535 - View products that this article applies to.
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This article describes the update that further improves the security of Windows Update (WU) / Microsoft Update (MU) client for Windows 8, Windows RT, Windows Server 2012, Windows 7 Service Pack 1 (SP1), and Windows Server 2008 R2 SP1.

Note Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2 with update 2919355 already include these improvements.

More information

Improvements

This update includes the following improvements:
  • Further hardening of infrastructure files that are used by WU/MU client
  • A more secure communication channel between the WU/MU client and service

Update information

How to obtain this update

This update will be rolled out gradually. It will be automatically installed if Automatic Updates is turned on and is either set to automatically install updates or notify to install updates.

This update can also be deployed through Windows Server Update Services (WSUS) or as a stand-alone package.
Deploying this update through WSUS
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PlatformOptions
Windows 7 SP1 and Windows Server 2008 R2 SP1
  • Install KB 2938066 on WSUS Server.
  • All Windows 7 SP1, Windows Server 2008 R2 SP1 computers that are being managed by the WSUS server will be automatically updated during the next scheduled AU (Automatic Updates) scan as long as "Automatic Updating" is turned ON.
Windows 8 and Windows Server 2012Approve KB 2937636 using the Admin console so that it can be deployed together with other updates for Windows per your deployment schedule.
Stand-alone packages for Windows 8 and Windows Server 2012
The following files are available for download from the Microsoft Download Center.
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Operating systemUpdate
All supported x86-based versions of Windows 8 (KB2937636)
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Download
Download the package now.
All supported x64-based versions of Windows 8 (KB2937636)
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Download
Download the package now.
All supported x64-based versions of Windows Server 2012 (KB2937636)
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Download
Download the package now.

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.
Stand-alone packages for Windows 7 SP1 and Windows Server 2008 R2 SP1
The following files are available for download from Windows Update.
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Operating systemUpdate
All supported x86-based versions of Windows 7 SP1
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Download
Download the package now.
All supported x64-based versions of Windows 7 SP1
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Download
Download the package now.
All supported x86-based versions of Windows Server 2008 R2 SP1
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Download
Download the package now.
All supported x64-based versions of Windows Server 2008 R2 SP1
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Download
Download the package now.
All supported Itanium-based versions of Windows Server 2008 R2 SP1
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Download
Download the package now.

Registry information

To apply this update, you do not have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this update.

Update replacement information

This update does not replace a previously released update.

File information

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The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows 7 and Windows Server 2008 R2 file information

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For all supported x86-based versions of Windows 7
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File NameFile VersionFile Size (bytes)DateTime
wuapi.dll7.6.7600.3205816005/14/20149:23 AM
wuapp.exe7.6.7600.320337925/14/20149:17 AM
wuauclt.exe7.6.7600.320542405/14/20149:23 AM
wuaueng.dll7.6.7600.32019737285/14/20149:23 AM
wucltux.dll7.6.7600.32024258565/14/20149:17 AM
wudriver.dll7.6.7600.320926725/14/20149:17 AM
wups.dll7.6.7600.320363205/14/20149:23 AM
wups2.dll7.6.7600.320455365/14/20149:23 AM
wuwebv.dll7.6.7600.3201796565/14/20149:23 AM

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For all supported x64-based versions of Windows 7 and Windows Server 2008 R2
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File NameFile VersionFile Size (bytes)DateTime
wuapi.dll7.6.7600.3207003845/14/20149:23 AM
wuapp.exe7.6.7600.320368645/14/20149:20 AM
wuauclt.exe7.6.7600.320583365/14/20149:23 AM
wuaueng.dll7.6.7600.3202,477,5365/14/20149:23 AM
wucltux.dll7.6.7600.32026209285/14/20149:21 AM
wudriver.dll7.6.7600.320977925/14/20149:20 AM
wups.dll7.6.7600.320388805/14/20149:23 AM
wups2.dll7.6.7600.320445125/14/20149:23 AM
wuwebv.dll7.6.7600.3201986005/14/20149:23 AM

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For all supported IA-64-based versions of Windows Server 2008 R2
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File NameFile VersionFile Size (bytes)DateTime
wuapi.dll7.6.7600.32012093125/14/20149:23 AM
wuapp.exe7.6.7600.320752645/14/20149:12 AM
wuauclt.exe7.6.7600.3201069765/14/20149:23 AM
wuaueng.dll7.6.7600.3204,444,1285/14/20149:23 AM
wucltux.dll7.6.7600.32036203525/14/20149:13 AM
wudriver.dll7.6.7600.3201909765/14/20149:12 AM
wups.dll7.6.7600.320583365/14/20149:23 AM
wups2.dll7.6.7600.320649925/14/20149:23 AM
wuwebv.dll7.6.7600.3203588565/14/20149:23 AM

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Windows 8 and Windows Server 2012 file information

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For all supported x86-based versions of Windows 8
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File NameFile VersionFile Size (bytes)DateTime
storewuauth.dll6.2.9200.169191495045/14/20143:41 PM
wuaext.dll7.8.9200.164511587211/5/20128:20 PM
wuapi.dll7.8.9200.169246292485/14/20143:42 PM
wuapp.exe7.8.9200.16917353285/14/20143:42 PM
wuauclt.exe7.8.9200.16917526565/14/20144:08 PM
wuaueng.dll7.8.9200.169242,600,4485/14/20143:42 PM
wucltux.dll7.8.9200.1691915569925/14/20143:42 PM
wudriver.dll7.8.9200.16917865285/14/20143:42 PM
wups.dll7.8.9200.16686209928/15/20133:43 PM
wups2.dll7.8.9200.16686215048/15/20133:43 PM
wusettingsprovider.dll7.8.9200.169172165765/14/20143:42 PM
wushareduxresources.dll7.8.9200.164519932811/5/20127:59 PM
wuwebv.dll7.8.9200.169171280005/14/20143:42 PM

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For all supported x64-based versions of Windows 8 and Windows Server 2012
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File NameFile VersionFile Size (bytes)DateTime
storewuauth.dll6.2.9200.16925176,6405/19/20144:24 PM
wuaext.dll7.8.9200.164511740811/5/20128:20 PM
wuapi.dll7.8.9200.16925773,6325/19/20144:24 PM
wuapp.exe7.8.9200.16917404485/14/20143:43 PM
wuauclt.exe7.8.9200.1692559,4165/19/20147:33 PM
wuaueng.dll7.8.9200.169253,286,5285/19/20144:24 PM
wucltux.dll7.8.9200.169251,623,0405/19/20144:24 PM
wudriver.dll7.8.9200.169251003525/19/20144:24 PM
wups.dll7.8.9200.16693496648/15/201310:21 PM
wups2.dll7.8.9200.16693491528/15/201310:21 PM
wusettingsprovider.dll7.8.9200.169252534405/19/20144:24 PM
wushareduxresources.dll7.8.9200.164519932811/5/20128:00 PM
wuwebv.dll7.8.9200.169171443845/14/20143:43 PM

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Windows RT file information
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File NameFile VersionFile Size (bytes)DateTime
storewuauth.dll6.2.9200.16919142,8485/14/20143:23 PM
wuaext.dll7.8.9200.164511689611/5/20127:24 PM
wuapi.dll7.8.9200.169246435845/14/20143:23 PM
wuapp.exe7.8.9200.16917337925/14/20143:23 PM
wuauclt.exe7.8.9200.16917516325/14/20143:36 PM
wuaueng.dll7.8.9200.1692423864325/14/20143:23 PM
wucltux.dll7.8.9200.1691915503365/14/20143:23 PM
wudriver.dll7.8.9200.16917860165/14/20143:23 PM
wups.dll7.8.9200.16693220168/15/20137:47 PM
wups2.dll7.8.9200.16693225288/15/20137:47 PM
wusettingsprovider.dll7.8.9200.169172094085/14/20143:23 PM
wushareduxresources.dll7.8.9200.164519932811/5/20127:08 PM
wuwebv.dll7.8.9200.169171239045/14/20143:23 PM

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Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More information

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

Properties

Article ID: 2887535 - Last Review: July 8, 2014 - Revision: 5.0
Applies to
  • Windows 8 Enterprise
  • Windows 8
  • Windows 8 Pro
  • Windows RT
  • Windows Server 2012 Datacenter
  • Windows Server 2012 Foundation
  • Windows Server 2012 Essentials
  • Windows Server 2012 Standard
  • Windows 7 Service Pack 1, when used with:
    • Windows 7 Enterprise
    • Windows 7 Professional
    • Windows 7 Ultimate
    • Windows 7 Home Premium
    • Windows 7 Home Basic
  • Windows Server 2008 R2 Service Pack 1, when used with:
    • Windows Server 2008 R2 Enterprise
    • Windows Server 2008 R2 Standard
    • Windows Server 2008 R2 Datacenter
Keywords: 
kbfix kbsurveynew kbexpertiseadvanced KB2887535

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