Summary

This security update resolves a vulnerability in Microsoft Windows. The vulnerability could allow elevation of privilege if an attacker uses the Microsoft Web Distributed Authoring and Versioning (WebDAV) client to send specifically crafted input to a server. To learn more about the vulnerability, see Microsoft Security Bulletin MS16-016.

More Information

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.

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 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 MS16-016 that corresponds to the version of Windows that you are running.

More Information

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

File Information

File name

SHA1 hash

SHA256 hash

Windows8.1-KB3124280-x86.msu

F13F6CF2732B3CB6D32A71E3B164393D59D78926

01E5BF2806FCE649A92C73565A35534F196FF64E26727E4ADDFCF65D37F22F98

Windows8-RT-KB3124280-x64.msu

060BEE6FBF597334392537EE976376284228147B

FD2443AED21E695443650874F0800E0FCD830A127C8399AD99B7C1711C26F588

Windows6.1-KB3124280-x86.msu

74F39EEDFE561769B1F9B76CDF99A10F5DF5B281

AE4A2F287528DF544B4169F096A0298C5FD77A86289C0BFEF405D1E892318BCB

Windows8.1-KB3124280-x64.msu

757E872B8A05457BC5272BAF244FA18444F2EF5F

C65045459EF7C1144A19D03B2A65F597A4A7654EC5E5535A5211B59CCC0A3B62

Windows6.0-KB3124280-x64.msu

00504E996F0F97D60A88DCF17B82A7379E37E9B4

6324CB9C722F0DB3C4155DE881E54C8316A610AAC110B2896BB664CCAA13E964

Windows6.0-KB3124280-x86.msu

A913C0D3E23420AB8F2CEA3D92DCCEDAB595BBAB

06EEF8BDC2F5ED02273D21E6A30B18FE84C9E0B2D8897171D780EE26E9298CCC

Windows6.1-KB3124280-x64.msu

E0DA5E691CCC01AC5F2139128EA4F5D676D9B367

6FB1FA0B1BC5282D1077BD23A18D9B499FDB2197130169EEEFD3646D33029E96

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables.

Windows 8.1 and Windows Server 2012 R2 file information

Notes

  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.3.960 0.17 xxx

    Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2

    RTM

    GDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

  • The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.

For all supported x86-based versions

File name

File version

File size

Date

Time

Platform

Mrxdav.sys

6.3.9600.18189

124,928

06-Jan-2016

17:43

x86

For all supported x64-based versions

File name

File version

File size

Date

Time

Platform

Mrxdav.sys

6.3.9600.18189

140,800

06-Jan-2016

18:25

x64

Windows Server 2012 file information

Notes

  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.2.920 0.17xxx

    Windows Server 2012

    RTM

    GDR

    6.2.920 0.21xxx

    Windows Server 2012

    RTM

    LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

  • The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.

For all supported x64-based versions

File name

File version

File size

Date

Time

Platform

Mrxdav.sys

6.2.9200.17619

142,336

04-Jan-2016

05:46

x64

Mrxdav.sys

6.2.9200.21738

142,336

04-Jan-2016

05:10

x64

Windows 7 and Windows Server 2008 R2 file information

Notes

  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.1.760 1.18xxx

    Windows 7 or Windows Server 2008 R2

    SP1

    GDR

    6.1.760 1.23 xxx

    Windows 7 or Windows Server 2008 R2

    SP1

    LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

  • The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.

For all supported x86-based versions

File name

File version

File size

Date

Time

Platform

Davclnt.dll

6.1.7601.23317

87,040

07-Jan-2016

18:50

x86

Mrxdav.sys

6.1.7601.19113

116,224

07-Jan-2016

17:35

x86

Mrxdav.sys

6.1.7601.23317

117,248

07-Jan-2016

17:37

x86

Webclnt.dll

6.1.7601.23317

208,896

07-Jan-2016

18:59

x86

For all supported x64-based versions

File name

File version

File size

Date

Time

Platform

Davclnt.dll

6.1.7601.23317

108,544

07-Jan-2016

19:05

x64

Mrxdav.sys

6.1.7601.19113

141,312

07-Jan-2016

17:42

x64

Mrxdav.sys

6.1.7601.23317

142,336

07-Jan-2016

17:49

x64

Webclnt.dll

6.1.7601.23317

263,680

07-Jan-2016

19:12

x64

Mrxdav.sys

6.1.7601.19113

116,224

07-Jan-2016

17:35

x86

Mrxdav.sys

6.1.7601.23317

117,248

07-Jan-2016

17:37

x86

Davclnt.dll

6.1.7601.23317

87,040

07-Jan-2016

18:50

x86

Webclnt.dll

6.1.7601.23317

208,896

07-Jan-2016

18:59

x86

Windows Vista and Windows Server 2008 file information

Notes

  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.0.600 2.19xxx

    Windows Vista or Windows Server 2008

    SP2

    GDR

    6.0.600 2.23xxx

    Windows Vista or Windows Server 2008

    SP2

    LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

  • The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.

For all supported x64-based versions

File name

File version

File size

Date

Time

Platform

Mrxdav.sys

6.0.6002.19576

139,776

07-Jan-2016

15:27

x64

Mrxdav.sys

6.0.6002.23886

139,776

07-Jan-2016

15:39

x64

Mrxdav.sys

6.0.6002.19576

115,200

07-Jan-2016

15:18

x86

Mrxdav.sys

6.0.6002.23886

115,200

07-Jan-2016

15:13

x86

For all supported x86-based versions

File name

File version

File size

Date

Time

Platform

Mrxdav.sys

6.0.6002.19576

115,200

07-Jan-2016

15:18

x86

Mrxdav.sys

6.0.6002.23886

115,200

07-Jan-2016

15:13

x86

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