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.
Method 2: Microsoft Download Center
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
How to obtain help and support for this security update
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
File Information
File hash 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 |
File information
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 |