This update is included in the Security and Quality Rollup that's dated November 14, 2017. This update was previously released as part of the Preview of Quality Rollup on October 17, 2017, the Security and Quality Rollup on October 10, 2017, and the Security and Quality Rollup on September 12, 2017.
This security update resolves a vulnerability in the Microsoft .NET Framework that could allow remote code execution when Microsoft .NET Framework processes untrusted input. An attacker who successfully exploits this vulnerability by using the .NET Framework could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts that have full user rights. Users whose accounts are configured to have fewer user rights on the system could be less affected than users who operate by using administrative user rights.
To exploit the vulnerability, an attacker must first convince the user to open a malicious document or application.This security update addresses the vulnerability by correcting how the .NET Framework validates untrusted input. To learn more about this vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2017-8759.
- All updates for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 require update KB 2919355 to be installed. We recommend that you install update KB 2919355 on your Windows RT 8.1-based, Windows 8.1-based, or Windows Server 2012 R2-based computer so that you receive updates in the future.
- 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.
Quality and reliability fixes
Description of the improvements
1 Common Language Runtime (CLR)
2 Windows Management Infrastructure (WMI)
The following article provide information about supported .NET Framework versions for this Windows version. This includes the month and year of release, update replacement information, and help and support information for the update.
4049017 November 2017 Security and Quality Rollup for .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2 and 4.7 updates for Windows 8.1, Windows RT 8.1 and Windows Server 2012 R2 (KB 4049017)
4042078 October 2017 Preview of Quality Rollup for .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2 and 4.7 updates for Windows 8.1, Windows RT 8.1 and Windows Server 2012 R2 (KB 4042078)
4043767 October 2017 Security and Quality Rollup for .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2, and 4.7 updates for Windows 8.1, Windows RT 8.1 and Windows Server 2012 R2 (KB 4043767)
4041085 Security and Quality Rollup for the .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2, and 4.7 for Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2: September 12, 2017
How to obtain and install the update
Method 1: Windows Update
This update is available through Windows Update. If automatic updating is turned on, this update is downloaded and installed automatically. For more information about how to get security updates automatically, see Windows Update: FAQ.
Method 2: Microsoft Update Catalog
To get the stand-alone package for this update, go to the Microsoft Update Catalog.
Method 3: Windows Software Update Services (WSUS)
On your WSUS server, follow these steps:
- Select Start, select Administrative Tools, and then select Microsoft Windows Server Update Services 3.0.
- Expand ComputerName, and then select Action.
- Select Import Updates.
- WSUS opens a browser window in which you may be prompted to install an ActiveX control. Install the ActiveX control to continue.
- After the control is installed, you see the Microsoft Update Catalog screen. Enter 4049017 in the Search box, and then select Search.
- Locate the .NET Framework packages that match the operating systems, languages, and processors in your environment. Select Add to add them to your basket.
- After you select all the packages that you need, select View Basket.
- Select Import to import the packages to your WSUS server.
- To return to WSUS, select Close after the packages have been imported.
The updates are now available for installation through WSUS.
Update deployment information
For deployment details for this security update, go to the following article in the Microsoft Knowledge Base:
20170912 Security update deployment information: September 12, 2017
Update removal information
Note We do not recommend that you remove any security update. To remove this update, use the Programs and Features item in Control Panel.
Update restart information
This update does not require a system restart after you apply it unless files that are being updated are locked or are being used.
Update replacement information
How to obtain help and support for this security update
- Help for installing updates: Windows Update FAQ
- Security solutions for IT professionals: TechNet Security Support and Troubleshooting
- Help for protecting your Windows-based products and services from viruses and malware: Microsoft Secure
- Local support according to your country: International Support