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 8.1 and Server 2012 R2 (KB 4470499)

**Applies to:**Microsoft .NET Framework 4.6, Microsoft .NET Framework 4.6.1, Microsoft .NET Framework 4.6.2, Microsoft .NET Framework 4.7, Microsoft .NET Framework 4.7.1, Microsoft .NET Framework 4.7.2

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

• 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, Windows RT 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:4471983 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 4471983)

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. Type4471983in 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 replaces update KB 3098785.

File information

File hash

File name	SHA1 hash	SHA256 hash
Windows8.1-KB4470499-x86.msu	39D6B02196096DD235202F0E7DC9CF9C4276D75D	C0E43EB6D8BCE0515E9AC4C347DCE01A41B41505C49219F5E4DF1D3A98FF03F2
Windows8.1-KB4470499-x64.msu	79650F1A6A9772E20E7D5867707576C994A6D36F	04991E85AB14686B78569B5AC2E79142DBE922E33BD78C29A13CB9AB1CD2FA58
Windows8.1-KB4470499-arm.msu	5B68CB80D4101BCEE93E49F77239827F4A9622EE	CC6CC8BC587874AE790763BD0C50B630403A86DEB333F6551DF9DD88F1CAEE17

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	4.7.3282.0	71,120	31-Oct-2018	01:33
system.web.extensions.dll	4.7.3282.0	1,850,264	31-Oct-2018	01:33
aspnet_perf.dll	4.7.3282.0	42,792	31-Oct-2018	01:33
aspnet_state_perf.h		318	30-Oct-2018	23:38
aspnet_state_perf.ini		42,996	31-Oct-2018	01:34
aspnet_wp.exe	4.7.3282.0	46,088	31-Oct-2018	01:33
msvcp120_clr0400.dll	12.0.52519.0	485,576	30-Oct-2018	22:54
msvcr120_clr0400.dll	12.0.52519.0	987,840	30-Oct-2018	22:54
system.web.extensions.dll	4.7.3282.0	1,850,264	31-Oct-2018	01:33
webengine4.dll	4.7.3282.0	550,152	31-Oct-2018	01:33
webengine.dll	4.7.3282.0	24,840	31-Oct-2018	01:33
system.web.dll	4.7.3282.0	5,416,232	31-Oct-2018	01:33

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
aspnet_perf.dll	4.7.3282.0	46,144	31-Oct-2018	01:32
aspnet_state_perf.h		318	30-Oct-2018	23:03
aspnet_state_perf.ini		42,996	31-Oct-2018	01:32
aspnet_wp.exe	4.7.3282.0	50,904	31-Oct-2018	01:32
msvcp120_clr0400.dll	12.0.52519.0	690,008	30-Oct-2018	22:54
msvcr120_clr0400.dll	12.0.52519.0	993,632	30-Oct-2018	22:54
system.web.applicationservices.dll	4.7.3282.0	71,120	31-Oct-2018	01:33
system.web.extensions.dll	4.7.3282.0	1,850,264	31-Oct-2018	01:33
webengine4.dll	4.7.3282.0	667,192	31-Oct-2018	01:32
webengine.dll	4.7.3282.0	26,168	31-Oct-2018	01:32
system.web.dll	4.7.3282.0	5,398,280	31-Oct-2018	01:32
system.web.applicationservices.dll	4.7.3282.0	71,120	31-Oct-2018	01:33
system.web.extensions.dll	4.7.3282.0	1,850,264	31-Oct-2018	01:33
aspnet_perf.dll	4.7.3282.0	42,792	31-Oct-2018	01:33
aspnet_state_perf.h		318	30-Oct-2018	23:38
aspnet_state_perf.ini		42,996	31-Oct-2018	01:34
aspnet_wp.exe	4.7.3282.0	46,088	31-Oct-2018	01:33
msvcp120_clr0400.dll	12.0.52519.0	485,576	30-Oct-2018	22:54
msvcr120_clr0400.dll	12.0.52519.0	987,840	30-Oct-2018	22:54
system.web.extensions.dll	4.7.3282.0	1,850,264	31-Oct-2018	01:33
webengine4.dll	4.7.3282.0	550,152	31-Oct-2018	01:33
webengine.dll	4.7.3282.0	24,840	31-Oct-2018	01:33
system.web.dll	4.7.3282.0	5,416,232	31-Oct-2018	01:33

File attributes for all supported ARM-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
msvcp120_clr0400.dll	12.0.52242.36242	602,080	30-Oct-2018	22:54
msvcr120_clr0400.dll	12.0.52242.36242	634,336	30-Oct-2018	22:54
system.web.extensions.dll	4.7.3282.0	1,850,264	31-Oct-2018	01:33
system.web.dll	4.7.3282.0	5,417,224	31-Oct-2018	01:30
system.web.applicationservices.dll	4.7.3282.0	71,120	31-Oct-2018	01:33
system.web.extensions.dll	4.7.3282.0	1,850,264	31-Oct-2018	01:33

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