Description of the Security Only update for .NET Framework 4.5.2 for Windows 8.1 and Server 2012 R2 (KB 4480074)

Summary

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 this vulnerability could retrieve from a web application content that is usually restricted.

This security update addresses the vulnerability by enforcing CORS configuration to prevent it from being bypassed.

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

Important

All updates for Windows 8.1 and Windows Server 2012 R2 require that update KB 2919355 is installed. We recommend that you install update KB 2919355 on your 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.

Additional information about this security update

For more information about this security update as it relates to Windows 8.1 and Windows Server 2012 R2, see the following article in the Microsoft Knowledge Base:

4481485 Security Only updates for .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, and 4.7.2 for Windows 8.1 and Server 2012 R2 (KB 4481485)

How to obtain and install the update

Method 1: Microsoft Update Catalog

To get the stand-alone package for this update, go to the Microsoft Update Catalog.

Method 2: 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 ActiveX control is installed, you see the Microsoft Update Catalog screen. Type 4481485 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 require, select View Basket.
To import the packages to your WSUS server, select Import.
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 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 3142030 and 2978041.

File information

File hash

File name	SHA1 hash	SHA256 hash
Windows8.1-KB4480074-x86.msu	8AE589530034E419E30C2443DA3F75424E3AA24E	4E50C17AA155EED1E59311282A19225034C8021D49F9F70051DA3542430245D4
Windows8.1-KB4480074-x64.msu	4006BCE8186D347C6EF045CBF15294B7D3D6D896	061473B5E3D29767D88229D1C273FBAA350F40A36E3A4F21DC7068CD60880DE2

File attributes for all supported x86-based systems

The English (United States) version of this update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and times may change when you perform certain operations on the files.

File name	File version	File size	Date	Time
system.dll	4.0.30319.36490	3,490,120	04-Dec-2018	14:12

File attributes for all supported x64-based systems