Update to Microsoft Update client

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

Platform

Options

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 2012

Approve 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.

Operating system

Update

All supported x86-based versions of Windows 8 (KB2937636)

Download Download the package now.

All supported x64-based versions of Windows 8 (KB2937636)

Download Download the package now.

All supported x64-based versions of Windows Server 2012 (KB2937636)

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.

Operating system

Update

All supported x86-based versions of Windows 7 SP1

Download Download the package now.

All supported x64-based versions of Windows 7 SP1

Download Download the package now.

All supported x86-based versions of Windows Server 2008 R2 SP1

Download Download the package now.

All supported x64-based versions of Windows Server 2008 R2 SP1

Download Download the package now.

All supported Itanium-based versions of Windows Server 2008 R2 SP1

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.

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

For all supported x86-based versions of Windows 7

File Name

File Version

File Size (bytes)

Date

Time

wuapi.dll

7.6.7600.320

581600

5/14/2014

9:23 AM

wuapp.exe

7.6.7600.320

33792

5/14/2014

9:17 AM

wuauclt.exe

7.6.7600.320

54240

5/14/2014

9:23 AM

wuaueng.dll

7.6.7600.320

1973728

5/14/2014

9:23 AM

wucltux.dll

7.6.7600.320

2425856

5/14/2014

9:17 AM

wudriver.dll

7.6.7600.320

92672

5/14/2014

9:17 AM

wups.dll

7.6.7600.320

36320

5/14/2014

9:23 AM

wups2.dll

7.6.7600.320

45536

5/14/2014

9:23 AM

wuwebv.dll

7.6.7600.320

179656

5/14/2014

9:23 AM


For all supported x64-based versions of Windows 7 and Windows Server 2008 R2

File Name

File Version

File Size (bytes)

Date

Time

wuapi.dll

7.6.7600.320

700384

5/14/2014

9:23 AM

wuapp.exe

7.6.7600.320

36864

5/14/2014

9:20 AM

wuauclt.exe

7.6.7600.320

58336

5/14/2014

9:23 AM

wuaueng.dll

7.6.7600.320

2,477,536

5/14/2014

9:23 AM

wucltux.dll

7.6.7600.320

2620928

5/14/2014

9:21 AM

wudriver.dll

7.6.7600.320

97792

5/14/2014

9:20 AM

wups.dll

7.6.7600.320

38880

5/14/2014

9:23 AM

wups2.dll

7.6.7600.320

44512

5/14/2014

9:23 AM

wuwebv.dll

7.6.7600.320

198600

5/14/2014

9:23 AM


For all supported IA-64-based versions of Windows Server 2008 R2


File Name

File Version

File Size (bytes)

Date

Time

wuapi.dll

7.6.7600.320

1209312

5/14/2014

9:23 AM

wuapp.exe

7.6.7600.320

75264

5/14/2014

9:12 AM

wuauclt.exe

7.6.7600.320

106976

5/14/2014

9:23 AM

wuaueng.dll

7.6.7600.320

4,444,128

5/14/2014

9:23 AM

wucltux.dll

7.6.7600.320

3620352

5/14/2014

9:13 AM

wudriver.dll

7.6.7600.320

190976

5/14/2014

9:12 AM

wups.dll

7.6.7600.320

58336

5/14/2014

9:23 AM

wups2.dll

7.6.7600.320

64992

5/14/2014

9:23 AM

wuwebv.dll

7.6.7600.320

358856

5/14/2014

9:23 AM


Windows 8 and Windows Server 2012 file information

For all supported x86-based versions of Windows 8


File Name

File Version

File Size (bytes)

Date

Time

storewuauth.dll

6.2.9200.16919

149504

5/14/2014

3:41 PM

wuaext.dll

7.8.9200.16451

15872

11/5/2012

8:20 PM

wuapi.dll

7.8.9200.16924

629248

5/14/2014

3:42 PM

wuapp.exe

7.8.9200.16917

35328

5/14/2014

3:42 PM

wuauclt.exe

7.8.9200.16917

52656

5/14/2014

4:08 PM

wuaueng.dll

7.8.9200.16924

2,600,448

5/14/2014

3:42 PM

wucltux.dll

7.8.9200.16919

1556992

5/14/2014

3:42 PM

wudriver.dll

7.8.9200.16917

86528

5/14/2014

3:42 PM

wups.dll

7.8.9200.16686

20992

8/15/2013

3:43 PM

wups2.dll

7.8.9200.16686

21504

8/15/2013

3:43 PM

wusettingsprovider.dll

7.8.9200.16917

216576

5/14/2014

3:42 PM

wushareduxresources.dll

7.8.9200.16451

99328

11/5/2012

7:59 PM

wuwebv.dll

7.8.9200.16917

128000

5/14/2014

3:42 PM


For all supported x64-based versions of Windows 8 and Windows Server 2012



File Name

File Version

File Size (bytes)

Date

Time

storewuauth.dll

6.2.9200.16925

176,640

5/19/2014

4:24 PM

wuaext.dll

7.8.9200.16451

17408

11/5/2012

8:20 PM

wuapi.dll

7.8.9200.16925

773,632

5/19/2014

4:24 PM

wuapp.exe

7.8.9200.16917

40448

5/14/2014

3:43 PM

wuauclt.exe

7.8.9200.16925

59,416

5/19/2014

7:33 PM

wuaueng.dll

7.8.9200.16925

3,286,528

5/19/2014

4:24 PM

wucltux.dll

7.8.9200.16925

1,623,040

5/19/2014

4:24 PM

wudriver.dll

7.8.9200.16925

100352

5/19/2014

4:24 PM

wups.dll

7.8.9200.16693

49664

8/15/2013

10:21 PM

wups2.dll

7.8.9200.16693

49152

8/15/2013

10:21 PM

wusettingsprovider.dll

7.8.9200.16925

253440

5/19/2014

4:24 PM

wushareduxresources.dll

7.8.9200.16451

99328

11/5/2012

8:00 PM

wuwebv.dll

7.8.9200.16917

144384

5/14/2014

3:43 PM


Windows RT file information



File Name

File Version

File Size (bytes)

Date

Time

storewuauth.dll

6.2.9200.16919

142,848

5/14/2014

3:23 PM

wuaext.dll

7.8.9200.16451

16896

11/5/2012

7:24 PM

wuapi.dll

7.8.9200.16924

643584

5/14/2014

3:23 PM

wuapp.exe

7.8.9200.16917

33792

5/14/2014

3:23 PM

wuauclt.exe

7.8.9200.16917

51632

5/14/2014

3:36 PM

wuaueng.dll

7.8.9200.16924

2386432

5/14/2014

3:23 PM

wucltux.dll

7.8.9200.16919

1550336

5/14/2014

3:23 PM

wudriver.dll

7.8.9200.16917

86016

5/14/2014

3:23 PM

wups.dll

7.8.9200.16693

22016

8/15/2013

7:47 PM

wups2.dll

7.8.9200.16693

22528

8/15/2013

7:47 PM

wusettingsprovider.dll

7.8.9200.16917

209408

5/14/2014

3:23 PM

wushareduxresources.dll

7.8.9200.16451

99328

11/5/2012

7:08 PM

wuwebv.dll

7.8.9200.16917

123904

5/14/2014

3:23 PM



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

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