Description of the Security and Quality Rollup for .NET Framework 4.5.2 for Windows 7 SP1, Server 2008 R2 SP1, and Server 2008 SP2 (KB 4480059)

This security update resolves a vulnerability in Microsoft .NET Framework that may cause an information disclosure that allows bypassing Cross-origin Resource Sharing (CORS) configurations.

An attacker who successfully exploits the vulnerability could retrieve from a web application content that's normally restricted.

This security update addresses the vulnerability by enforcing CORS configuration to prevent its bypass.

To learn more about this vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2019-0545.

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.

For more information about this update as it relates to Windows 7 Service Pack 1 (SP1) and Windows Server 2008 R2 SP1, see the following article in the Microsoft Knowledge Base:

4481488 January 2019 Preview of the Quality Rollups for .NET Framework 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, and 4.7.2 for Windows 7 SP1 and Server 2008 R2 SP1 (KB 4481488)

4481480 Security and Quality Rollup updates for .NET Framework 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, and 4.7.2 for Windows 7 SP1 and Server 2008 R2 SP1 (KB 4481480)

For more information about this update as it relates to Windows Server 2008 SP2, see the following article in the Microsoft Knowledge Base:

4481491 January 2019 Preview of the Quality Rollups for .NET Framework 2.0 SP2, 3.0 SP2, 4.5.2, and 4.6 for Windows Server 2008 SP2 (KB 4481491)

4481486 Security and Quality Rollup updates for .NET Framework 2.0 SP2, 3.0 SP2, 4.5.2, and 4.6 for Windows Server 2008 SP2 (KB 4481486)

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.

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 ActiveX control is installed, you see the Microsoft Update Catalog screen. Type 4481488 for Windows 7 SP1 and Windows Server 2008 R2 SP1 or type 4481491 for Windows Server 2008 SP2 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. To import the packages to your WSUS server, select Import.
9. After the packages are imported, select Close to return to WSUS.

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:

20190108 Security update deployment information: January 8, 2019

Update removal information

Note We don't 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 doesn't 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 previously released updates KB 4471987, KB 4471990, KB 4467224, and KB 4467227.

• Help for installing updates: Windows Update FAQ
• Protect yourself online and at home: Windows Security support
• Local support according to your country: International Support