Description of the Security Only update for .NET Framework 4.5.2 for Windows Server 2012 (KB 4470492)

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 Server 2012, see the following article in the Microsoft Knowledge Base:

4471982 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 Server 2012 (KB 4471982)

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 4471982 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 3098780 and KB 3037580.

File information

File hash

File name	SHA1 hash	SHA256 hash
Windows8-RT-KB4470492-x86.msu	3CF097E7F88EB88F726A1ACE75CFCB0EC340AAFA	BA17861BB580C1DA5272E3A4D7B9C74F8D4974AA24D6F3EAE52464DE5D7296E0
Windows8-RT-KB4470492-x64.msu	68786E8637AA5C1C60918821A68E64A0F302DE56	1964978CE191F678AFDE2E84899E1D372B52F1370B54C98FDA19AD6E4325F082

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.applicationservices.dll	4.0.30319.36480	71,208	02-Nov-2018	13:06
system.web.extensions.dll	4.0.30319.36480	1,859,568	02-Nov-2018	13:06
system.web.mobile.dll	4.0.30319.36480	839,768	09-Nov-2018	14:06
aspnet_perf.h		7,177	15-Nov-2017	00:50
aspnet_perf2.ini		995,534	15-Nov-2017	00:50
aspnet_perf2_d.ini		31	15-Nov-2017	00:50
aspnet_state_perf.h		318	15-Nov-2017	00:50
aspnet_state_perf.ini		42,996	15-Nov-2017	00:50
aspnet_state_perf_d.ini		36	15-Nov-2017	00:50
aspnet_perf.dll	4.0.30319.36480	41,536	07-Nov-2018	14:12
aspnet_state_perf.h		318	15-Nov-2017	00:50
aspnet_state_perf.ini		42,996	15-Nov-2017	00:50
aspnet_wp.exe	4.0.30319.36480	43,016	02-Nov-2018	13:06
msvcp120_clr0400.dll	12.0.52480.36480	536,856	02-Nov-2018	13:06
msvcr120_clr0400.dll	12.0.52480.36480	875,800	02-Nov-2018	13:06
system.web.extensions.dll	4.0.30319.36480	1,859,568	02-Nov-2018	13:06
webengine4.dll	4.0.30319.36480	509,696	02-Nov-2018	13:06
webengine.dll	4.0.30319.36480	24,832	02-Nov-2018	13:06
system.web.dll	4.0.30319.36480	5,464,640	02-Nov-2018	13:06

File attributes for all supported x64-based systems