Summary
This security update resolves a vulnerability in Active Directory Federation Services (AD FS). The vulnerability could allow denial of service if an attacker sends certain input data during forms-based authentication to an AD FS server. This scenario causes the server to become unresponsive.
To learn more about the vulnerability, see Microsoft Security Bulletin MS16-020.
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Important
- All future security and nonsecurity updates for Windows Server 2012 R2 require update 2919355 to be installed. We recommend that you install update 2919355 on your 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.
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 MS16-020 that corresponds to the version of Windows that you are running.
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Security update deployment information
Windows Server 2012 R2 (all editions)Reference table
The following table contains the security update information for this software.
| Security update file name | For all supported editions of Windows Server 2012 R2: Windows8.1-KB3134222x64.msu |
|---|---|
| Installation switches | See Microsoft Knowledge Base article 934307 |
| Restart requirement | In some cases, this update does not require a system restart. If the required files are being used, this update will require a system restart. If this behavior occurs, you receive a message that advises you to restart your system. |
| Removal information | To uninstall an update installed by WUSA, use the /Uninstall setup switch. Or, click Control Panel, click System and Security, click Windows Update, and under See also, click Installed updates, and then select from the list of updates. |
| File information | See the File information section. |
| Registry key verification | Note There is no registry key to validate the presence of this update. |
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-KB3134222-x64.msu | FBDDACC3ED1B90CB3032A86A0A0C677B0CBCAC06 | 8216F3FC687488470E772D57557D3DA5C692ECF66A54D31537A881E33C2BFC6C |
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 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 0.17xxx 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 x64-based versions
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Microsoft.identityserver.diagnostics.dll | 6.3.9600.18192 | 151,552 | 13-Jan-2016 | 15:41 | x86 |
| Microsoft.identityserver.proxyservice.exe | 6.3.9600.18192 | 73,216 | 13-Jan-2016 | 15:41 | x86 |
| Microsoft.identityserver.proxyservice.exe.config | Not applicable | 1,067 | 15-Mar-2014 | 00:10 | Not applicable |
| Microsoft.identityserver.service.dll | 6.3.9600.18192 | 696,832 | 13-Jan-2016 | 15:41 | x86 |
| Microsoft.identityserver.webhost.dll | 6.3.9600.18192 | 175,104 | 13-Jan-2016 | 15:41 | x86 |
| Microsoft.identityserver.web.dll | 6.3.9600.18192 | 816,640 | 13-Jan-2016 | 15:41 | x86 |
| Microsoft.identityserver.dll | 6.3.9600.18192 | 655,872 | 13-Jan-2016 | 15:41 | x86 |