Applies to:
Microsoft .NET Framework 3.5.1
IMPORTANT Verify that you have installed the required updates listed in the How to get this update section before installing this update.　
IMPORTANT　Some customers who use Windows Server 2008 R2 SP1 and have activated their ESU multiple activation key (MAK) add-on before installing the January 14, 2020 updates might need to re-activate their key.　Re-activation on the affected devices should only be required once.  For information on activation, see this blog post.
IMPORTANT　WSUS scan cab files will continue to be available for Windows 7 SP1 and Windows Server 2008 R2 SP1.　If you have a subset of devices running these operating systems without ESU, they might show as　non-compliant in your patch management and compliance toolsets.
IMPORTANT　Customers who have purchased the Extended Security Update (ESU) for on-premises versions of these operating systems must follow the procedures in KB4522133 to continue receiving security updates after extended support ends on January 14, 2020.　For more information on ESU and which editions are supported, see KB4497181.
IMPORTANT　Starting on January 15, 2020, a full-screen notification will appear that describes the risk of continuing to use Windows 7 Service Pack 1 after it reaches end of support on January 14, 2020. The notification will remain on the screen until you interact with it. This notification will only appear on the following　editions of Windows 7 Service Pack 1:
Note　The notification will not appear on domain-joined machines or machines in kiosk mode.
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Starter.
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Home Basic.
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Home Premium.
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Professional. If you have purchased the Extended Security Update (ESU), the notification　will not appear. For more information, see How to get Extended Security Updates for eligible Windows devices and Lifecycle FAQ-Extended Security Updates.
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Ultimate.
Summary
Security improvements
An elevation of privilege vulnerability exists when ASP.NET or .NET Framework web applications running on IIS improperly allow access to cached files. An attacker who successfully exploited this vulnerability could gain access to restricted files. To exploit this vulnerability, an attacker would need to send a specially crafted request to an affected server. The update addresses the vulnerability by changing how ASP.NET and .NET Framework handle requests.
To learn more about the vulnerabilities, go to the following Common Vulnerabilities and Exposures (CVE).
A remote code execution vulnerability exists when Microsoft .NET Framework processes input. An attacker who successfully exploited this vulnerability could take control of an affected system. To exploit the vulnerability, an attacker would need to be able to upload a specially crafted file to a web application. The security update addresses the vulnerability by correcting how .NET Framework processes input.
For more information go to: https://go.microsoft.com/fwlink/?linkid=2138023
To learn more about the vulnerabilities, go to the following Common Vulnerabilities and Exposures (CVE).
Additional information about this update
The following articles contain additional information about this update as it relates to individual product versions.
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4570500 Description of the Security Only Update for .NET Framework 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows 7 SP1 and Windows Server 2008 R2 SP1 (KB4570500)
How to obtain and install the update
Before installing this update
Prerequisite:
To apply this update, you must have .NET Framework 3.5.1 installed.
You must install the updates listed below and restart your device before installing the latest Rollup. Installing these updates improves the reliability of the update process and mitigates potential issues while installing the Rollup and applying Microsoft security fixes.
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The March 12, 2019 servicing stack update (SSU) (KB4490628). To get the standalone package for this SSU, search for it in the Microsoft Update Catalog. This update is required to install updates that are only SHA-2 signed.
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The latest SHA-2 update (KB4474419) released September 10, 2019. If you are using Windows Update, the latest SHA-2 update will be offered to you automatically. This update is required to install updates that are only SHA-2 signed. For more information on SHA-2 updates, see 2019 SHA-2 Code Signing Support requirement for Windows and WSUS.
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The Extended Security Updates (ESU) Licensing Preparation Package (KB4538483) released February 11, 2020. The ESU licensing preparation package will be offered to you from WSUS. To get the standalone package for ESU licensing preparation package, search for it in the Microsoft Update Catalog.
Install this update
|
Release Channel |
Available |
Next Step |
|
Microsoft Update Catalog |
Yes |
To get the standalone package for this update, go to the Microsoft Update Catalog website. |
|
Windows Server Update Services (WSUS) |
Yes |
This update will automatically sync with WSUS if you configure Products and Classifications as follows: Product: Windows 7 Service Pack 1, Windows Server 2008 R2 Service Pack 1,Windows Embedded Standard 7 Service Pack 1, Windows Embedded POSReady 7 Classification: Security Updates |
Restart requirement
You must restart the computer after you apply this update if any affected files are being used. We recommend that you exit all .NET Framework-based applications before you apply this update.
Update deployment information
For deployment details for this security update, go to the following article in the Microsoft Knowledge Base:
20200811 Security update deployment information: August 11, 2020
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.
File information The English (United States) version of this software update installs files that have the attributes that are listed in the following tables.Windows 7 and Windows Server 2008 R2 file information
Note:Â The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.
File information
File hash information
|
File name |
SHA1 hash |
SHA256 hash |
|---|---|---|
|
Windows6.1-KB4569736-x64.msu |
0BD4A25D7E6DCB744D6D0D98DA096564079A3DC8 |
EDA8D3ABBAD3325349FC27C54C9F6488E402F949D62F71CD8D21AFDE61661645 |
|
Windows6.1-KB4569736-x86.msu |
CFE06928D60254EE4045DDBD0A90DF95C72D90B6 |
64097A53527B2303BA4353F6299E5FDDA62A55DB517E2DA761C0634F69FBCFB3 |
For all supported x64-based versions
|
File name |
File version |
File size |
Date |
Time |
Platform |
SP requirement |
Service branch |
|
Aspnet_wp.exe |
2.0.50727.8951 |
45,456 |
16-Jul-2020 |
00:28 |
x64 |
SPN |
AMD64_NETFX-ASP |
|
System.web.regularexpressions.dll |
2.0.50727.8951 |
98,304 |
16-Jul-2020 |
00:28 |
x86 |
None |
Not applicable |
|
Webengine.dll |
2.0.50727.8951 |
748,936 |
16-Jul-2020 |
00:28 |
x64 |
None |
Not applicable |
|
System.web.dll |
2.0.50727.8951 |
5,300,224 |
16-Jul-2020 |
00:28 |
x64 |
None |
Not applicable |
|
System.web.regularexpressions.dll |
2.0.50727.8951 |
98,304 |
16-Jul-2020 |
00:29 |
x86 |
None |
Not applicable |
|
Aspnet_wp.exe |
2.0.50727.8951 |
33,680 |
16-Jul-2020 |
00:29 |
x86 |
SPN |
X86_NETFX-ASP |
|
Webengine.dll |
2.0.50727.8951 |
439,680 |
16-Jul-2020 |
00:29 |
x86 |
None |
Not applicable |
|
System.web.dll |
2.0.50727.8951 |
5,292,032 |
16-Jul-2020 |
00:29 |
x86 |
None |
Not applicable |
For all supported x86-based versions
|
File name |
File version |
File size |
Date |
Time |
Platform |
SP requirement |
Service branch |
|
System.web.regularexpressions.dll |
2.0.50727.8951 |
98,304 |
16-Jul-2020 |
00:29 |
x86 |
None |
Not applicable |
|
Aspnet_wp.exe |
2.0.50727.8951 |
33,680 |
16-Jul-2020 |
00:29 |
x86 |
SPN |
X86_NETFX-ASP |
|
Webengine.dll |
2.0.50727.8951 |
439,680 |
16-Jul-2020 |
00:29 |
x86 |
None |
Not applicable |
|
System.web.dll |
2.0.50727.8951 |
5,292,032 |
16-Jul-2020 |
00:29 |
x86 |
None |
Not applicable |
Information about protection and security
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Protect yourself online: Windows Security support
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Learn how we guard against cyber threats: Microsoft Security
