Description of the Security Only update for .NET Framework 4.5.2 for Windows 7 SP1, Server 2008 R2 SP1, and Server 2008 SP2 (KB 4470493)

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.

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.

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 SP1, 4.5.2, and 4.6 for Windows 7 SP1 and Server 2008 SP2 and for .NET Framework 4.6 for Server 2008 SP2 (KB 4471981)

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

4471984 Security Only updates for .NET Framework 3.5 SP1, 4.5.2, and 4.6 for Windows Server 2008 SP2 (KB 4471984)

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. Install the ActiveX control to continue.
After the ActiveX control is installed, you see the Microsoft Update Catalog screen. Type 4471981 for Windows 7 SP1 and Windows Server 2008 R2 SP1 or type 4471984 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 need, 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:

20181211 Security update deployment information: December 11, 2018

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 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 KB 3098781 and KB 3037581.

File information

File hash

File name	SHA1 hash	SHA256 hash
NDP45-KB4470493-x86.exe	6CBC40A99A1CFF77266D6E8931992EE2CA933317	DECCCF66AD10528E4F18ABC39B98A75EF8CF593F9EE6AB904C487CECB32FBB90
NDP45-KB4470493-x64.exe	AA95B2E7B0B2140007DE157386DD038C8E9ACE98	FF5AA249676F16174C86B84D923B7F7A7F0B442A484A635905DD2F0F4A7D3C56

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
Aspnet_perf.dll	4.0.30319.36480	41,536	01-Nov-2018	19:55
aspnet_wp.exe	4.0.30319.36480	43,016	01-Nov-2018	19:56
System.Web.ApplicationServices.dll	4.0.30319.36480	71,208	01-Nov-2018	19:55
System.Web.Extensions.dll	4.0.30319.36480	1,859,568	01-Nov-2018	19:56
System.Web.dll	4.0.30319.36480	5,464,640	01-Nov-2018	19:56
System.Web.Mobile.dll	4.0.30319.36480	839,768	01-Nov-2018	19:56
webengine.dll	4.0.30319.36480	24,832	01-Nov-2018	19:56
webengine4.dll	4.0.30319.36480	509,696	01-Nov-2018	19:56
msvcp120_clr0400.dll	12.0.52480.36480	536,856	01-Nov-2018	19:55
msvcr120_clr0400.dll	12.0.52480.36480	875,800	01-Nov-2018	19:55

File attributes for all supported x64-based systems