Security and Quality Rollup for .NET Framework 3.5.1 for Windows 7 SP1 and Windows Server 2008 R2 SP1 (KB 4040980)


Notice


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.

Summary


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. The 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.

Important

  • 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


Area

Description of the improvement(s)

CLR1
  • Very rarely, an instance of ReaderWriterLock may hang in the process of releasing a lock. A new configuration variable is introduced to allow opting in to the fix. To fix the issue, set the COMPlus_ReaderWriterLock_UseFixedIdGeneration environment variable to 1 before you start the application.

Networking

  • A fix that was included in the May Monthly Security and Quality Rollup is changed to improve the performance of network latency. This latency affects Active Directory lookups for the enhanced key usage (EKU) object identifiers (OIDs) function that is used in TLS (Transport Layer Security) and SSL (Secure Sockets Layer) certificates.
WMI2
  • Code is changed to make the setting of the privileges event-driven so that it can support changes in the option values.

1 Common Language Runtime (CLR)
2 Windows Management Infrastructure (WMI)

More information


The following article provides information about supported .NET Framework versions for this Windows version, specifically: the month and year of release, update replacement information, and help and support information for the update.

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 September 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 4041083)

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:

  1. Select Start, select Administrative Tools, and then select Microsoft Windows Server Update Services 3.0.
  2. Expand ComputerName, and then select Action.
  3. Select Import Updates.
  4. WSUS opens a browser window in which you may be prompted to install an ActiveX control. Install the ActiveX control to continue.
  5. After the control is installed, you see the Microsoft Update Catalog screen. Enter 4049016 in the Search box, and then select Search.
  6. Locate the .NET Framework packages that match the operating systems, languages, and processors in your environment. Select Add to add them to your basket.
  7. After you select all the packages that you need, select View Basket.
  8. Select Import to import the packages to your WSUS server.
  9. 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

This update replaces updates 4035036 and 4032113.

File information


 

How to obtain help and support for this security update


Applies to


This article applies to the following:
 
  • Microsoft .NET Framework 3.5.1 when used with:
    • Windows Server 2008 R2 Service Pack 1
    • Windows 7 Service Pack 1