Description of the Security Only update for .NET Framework 3.5.1 for Windows 7 SP1 and Server 2008 R2 SP1 (KB 4470600)

**Applies to:**Microsoft .NET Framework 3.5.1

Summary

This security update resolves a vulnerability in Microsoft .NET Framework that could allow remote code execution when Microsoft .NET Framework doesn’t validate input correctly. An attacker who successfully exploits this vulnerability could take control of an affected system. The attacker could then install programs; view, change, or delete data; or create new accounts that use full user rights. Users whose accounts are configured to have fewer user rights on the system could be less affected than users who operate with administrative user rights.To exploit the vulnerability, an attacker would have to pass specific input to an application that uses susceptible .NET Framework methods.This security update addresses the vulnerability by correcting how .NET Framework validates input.To learn more about this vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2018-8540.ImportantIf 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 7 SP1 and Windows Server 2008 R2 SP1, see the following article in the Microsoft Knowledge Base:4471981 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 4471981)

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:

1. Select Start, selectAdministrative Tools, and then selectMicrosoft Windows Server Update Services 3.0.
2. Expand ComputerName, and then selectAction.
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. Type4471981in theSearchbox, and then selectSearch.
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:20181211 Security update deployment information: December 11, 2018

Update removal information

Note We do not recommend that you remove any security update. To remove this update, use thePrograms 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 does not replace any previously released update.

File information

File hash

File name	SHA1 hash	SHA256 hash
Windows6.1-KB4470600-x86.msu	7C48E9A4F485DB60F0C10E2215908D95770EFF21	7F80AA95929B5ABBE8986707397745AD533E623636F2DC98AF1C30E9218F63E1
Windows6.1-KB4470600-x64.msu	0B8E908773F4532C805A62D41F4D887F11589594	69D068D037C736C7D409634CB2380671D896692ED1766D0168A7C4364448509A
Windows6.1-KB4470600-ia64.msu	7C976DC259814FB32C73EC968B26B19710386386	3C4CAE8DAE05DB4E9568A1674349B873BC08C8963EA98EA62B88ADC7C3F266C4

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.web.extensions.dll	3.5.30729.8814	1,282,048	02-Nov-2018	13:04
system.web.extensions.dll	3.5.30729.8814	1,282,048	02-Nov-2018	13:04

File attributes for all supported x64-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.web.extensions.dll	3.5.30729.8814	1,282,048	02-Nov-2018	13:05
system.web.extensions.dll	3.5.30729.8814	1,282,048	02-Nov-2018	13:04
system.web.extensions.dll	3.5.30729.8814	1,282,048	02-Nov-2018	13:04

File attributes for all supported IA64-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.web.extensions.dll	3.5.30729.8814	1,282,048	02-Nov-2018	13:04
system.web.extensions.dll	3.5.30729.8814	1,282,048	02-Nov-2018	13:04
system.web.extensions.dll	3.5.30729.8814	1,282,048	02-Nov-2018	13:04

How to obtain help and support for this security update

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