Description of the Security Only update for .NET Framework 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 and for .NET Framework 4.6 for Server 2008 SP2 (KB 4483470)

Summary

This security update resolves vulnerabilities in Microsoft .NET Framework that could allow the following:

A Remote Code Execution vulnerability in .NET Framework software if the software does not check the source markup of a file. An attacker who successfully exploits the vulnerability could run arbitrary code in the context of the current user. If the current user is logged on by using administrative user rights, an attacker could take control of the 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 have administrative user rights.

Exploitation of the vulnerability requires a user to open a specially crafted file that has an affected version of .NET Framework. In an email attack scenario, an attacker could exploit the vulnerability by sending the specially crafted file to the user and convincing the user to open the file.

This security update addresses the vulnerability by correcting how .NET Framework checks the source markup of a file.

To learn more about this vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2019-0613.
A vulnerability in certain .NET Framework APIs that parse URLs. An attacker who successfully exploits this vulnerability could use it to bypass security logic that's intended to make sure that a user-provided URL belonged to a specific host name or a subdomain of that host name. This could be used to cause privileged communication to be made to an untrusted service as if it were a trusted service.

To exploit the vulnerability, an attacker must provide a URL string to an application that tries to verify that the URL belongs to a specific host name or to a subdomain of that host name. The application must then make an HTTP request to the attacker-provided URL either directly or by sending a processed version of the attacker-provided URL to a web browser.

To learn more about this vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2019-0657.

Important

All updates for .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1 and 4.7.2 require that the d3dcompiler_47.dll update is installed. We recommend that you install the included d3dcompiler_47.dll update before you apply this update. For more information about the d3dcompiler_47.dll update, see KB 4019990 for Windows 7 SP1 and Windows Server 2008 R2 SP1. Or, see KB 4019478 for Windows Server 2008 SP2.
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 update

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:

4487121 Security Only 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 4487121)

For more information about this update as it relates to Windows Server 2008 Service Pack 2 (SP2), see the following article in the Microsoft Knowledge Base:

4487124 Security Only updates for .NET Framework 2.0 SP2, 3.0 SP2, 4.5.2, and 4.6 for Windows Server 2008 SP2 (KB 4487124)

How to obtain and install the update

Method 1: Microsoft Update Catalog

To get the standalone 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 4487121 for Windows 7 SP1 and Windows Server 2008 R2 SP1 or type 4487124 for Windows Server 2008 SP2 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:

20190212 Security update deployment information: February 12, 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 the following updates:

For Windows 7 SP1 and Server 2008 R2 SP1, this update replaces updates 4481487 and 4457917.
For Windows Server 2008 SP2, this update replaces updates 4481481 and 4457914.

File information

File hash

File name	SHA1 hash	SHA256 hash
NDP46-KB4483470-x86.exe	74A74CA3A4A912B4F1854025B67A6546E6C86E75	7F7E9D1156C2B356B2FE239BEB54384C9F614715EC125FB621F5E468630B7CBB
NDP46-KB4483470-x64.exe	0D49AEFF854BEC0A946BFDE3C8E12DF05BB09062	33FDE27436B1680A47593FCCBBDB5920AA1933212ECFAEB7829CA2D42BC8513B

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.Workflow.Activities.dll	4.7.3353.0	1,051,192	20-Dec-2018	23:08
System.Workflow.ComponentModel.dll	4.7.3353.0	1,549,880	20-Dec-2018	23:08
System.Workflow.Runtime.dll	4.7.3353.0	498,936	20-Dec-2018	23:08
System.dll	4.7.3353.0	3,558,192	20-Dec-2018	23:07
WorkflowServiceHostPerformanceCounters.dll	4.7.3353.0	89,352	20-Dec-2018	23:07

File attributes for all supported x64-based systems