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.
- 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)
The following articles 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.
For Windows 7 SP1 and Windows Server 2008 R2 SP1
4049016 November 2017 Security and Quality Rollup for .NET Framework 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2 and 4.7 updates for Windows 7 SP1 and Windows Server 2008 R2 SP1 (KB 4049016)
4042076 October 2017 Preview of Quality Rollup for .NET Framework 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2 and 4.7 updates for Windows 7 SP1 and Windows Server 2008 R2 SP1 (KB 4042076)
4043766 October 2017 Security and Quality Rollup for .NET Framework 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, and 4.7 for Windows 7 SP1 and Windows Server 2008 R2 SP1 (KB 4043766)
4041083 Security and Quality Rollup for the .NET Framework 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2 and 4.7 for Windows 7 SP1 and Windows Server 2008 R2 SP1: September 12, 2017
For Windows Server 2008 SP2
4049019 November 2017 Security and Quality Rollup for .NET Framework 2.0 SP2, 4.5.2 and 4.6 updates for Windows Server 2008 SP2 (KB 4049019)
4042201 October 2017 Preview of Quality Rollup for .NET Framework 2.0 SP2, 4.5.2 and 4.6 updates for Windows Server 2008 SP2 (KB 4042201)
4043768 October 2017 Security and Quality Rollup for .NET Framework 2.0 SP2, 4.5.2, and 4.6 updates for Windows Server 2008 SP2 (KB 4043768)
4041086 Security and Quality Rollup for the .NET Framework 2.0 SP2, 4.5.2, and 4.6 for Windows Server 2008 SP2: September 12, 2017
When you apply this update by using the interactive setup wizard on non-English locale systems, you notice that the interactive setup wizard dialog boxes contains some pseudo localized characters instead of localized content. This is a non-impacting, UI-only setup issue that does not affect the deployment result or functionality of the update contents. Please apply this update to help secure your computer against vulnerabilities and the issues that are addressed by this update.
For more information about this issue, go to the following article in the Microsoft Knowledge Base:
4043564 Certain .NET Framework 4.5.2 updates contain pseudo non-English characters in the Setup Wizard UI
This issue is resolved in all .NET Framework 4.5.2 releases starting on October 10, 2017.
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 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.
- For Windows 7 SP1 and Windows Server 2008 R2 SP1, go to 4049016.
- For Windows Server 2008 SP2, go to 4049019.
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. You must install the ActiveX control to continue.
- After the control is installed, you see the Microsoft Update Catalog screen. In the Search box, Enter 4049016 for Windows 7 SP1 and Windows Server 2008 R2 SP1 or enter 4049019 for Windows Server 2008 SP2, 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 are 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