Applies to:
Microsoft .NET Framework 4.8
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.
-
Starter.
-
Home Basic.
-
Home Premium.
-
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.
-
Ultimate.
IMPORTANT Starting in August, 2019, updates to .NET Framework 4.6 and above, for Windows Server 2008 R2 SP1, and Windows 7SP1, require SHA-2 Code signing support. Please make sure that you have all the latest Windows Updates before applying this update to avoid installation issues. For more detailed information about SHA-2 code signing support updates, please see KB 4474419.
Summary
A remote code execution vulnerability exists in .NET Framework software when the software fails to check the source markup of a file. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of .NET Framework. In an email attack scenario, an attacker could exploit the vulnerability by sending the specially crafted file to the user and convincing the user to open the file. The security update addresses the vulnerability by correcting how .NET Framework checks the source markup of a file.
To learn more about the vulnerabilities, go to the following Common Vulnerabilities and Exposures (CVE).
A denial of service vulnerability exists when .NET Framework improperly handles web requests. An attacker who successfully exploited this vulnerability could cause a denial of service against a .NET Framework web application. The vulnerability can be exploited remotely, without authentication. A remote unauthenticated attacker could exploit this vulnerability by issuing specially crafted requests to the .NET Framework application. The update addresses the vulnerability by correcting how the .NET Framework web application handles web requests.
To learn more about the vulnerabilities, go to the following Common Vulnerabilities and Exposures (CVE).
Quality and reliability improvements
|
Winforms |
- Addresses an issue with WinForms ComboBox control reinitialization in AD FS MMC UI. - Adresses an issue getting accessible objects for PropertyGridView ComboBox property items - adding the verification for item existence and validity. - Addresses an issue with interaction between WPF user control and hosting WinForms app when processing keyboard input. |
|
Workflow |
- Addresses an accessibility issue where text inside a Windows Workflow Foundation Visual Basic Editor would use the wrong colors in high contrast themes. |
|
CLR1 |
- Addresses rare crashes that could occur if Server GC is enabled and a GC occurs while another thread is running NGen'ed code which is making the initial call into NGen'ed code in a 2nd module where one or more parameter types involve valuetypes defined in a 3rd module. - Addresses crashes that could occur in certain scenarios involving hot-added CPUs and/or multi-group machines where per-group CPU count is not consistent across all groups - Addresses rare crashes or deadlocks that could occur if a GC occurs while another thread is running NGen'ed code which is making the initial call into a static method within the same module where one or more parameter types involve type-forwarded valuetypes. - Addresses rare crashes that could occur during the first call that native code makes into the managed portion of a mixed-mode DLL. |
1 Common Language Runtime (CLR)
Known issues in this update
|
Symptom |
This update does not install, and it returns either or both of the following error messages:
|
|
Workaround |
This issue has been corrected in the latest Security and Quality Rollup for .NET Framework. |
Additional information about this update
The following articles contain additional information about this update as it relates to individual product versions.
-
4556399 Description of the Security and Quality Rollup 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 (KB4556399)
How to obtain and install the update
Before installing this update
Prerequisite:
To apply this update, you must have .NET Framework 4.8 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.
-
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.
-
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.
-
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 |
|
Windows Update and Microsoft Update |
Yes |
None. This update will be downloaded and installed automatically from Windows Update if you are an ESU customer. |
|
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:
20200512 Security update deployment information: May 12, 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.
Update replacement information
This update replaces previously released updates 4533095 and 4535102.
File information
The English (United States) version of this software update installs files that have the attributes that are listed in the following tables.
x86
|
File name |
File version |
File size |
Date |
Time |
|---|---|---|---|---|
|
Aspnet_perf.dll |
4.8.4075.0 |
43,800 |
29-Apr-2020 |
17:19 |
|
aspnet_wp.exe |
4.8.4075.0 |
47,608 |
29-Apr-2020 |
17:19 |
|
clr.dll |
4.8.4180.0 |
8,044,832 |
29-Apr-2020 |
17:19 |
|
clrjit.dll |
4.8.4180.0 |
561,648 |
29-Apr-2020 |
17:19 |
|
mscordacwks.dll |
4.8.4180.0 |
1,315,104 |
29-Apr-2020 |
17:19 |
|
mscordbi.dll |
4.8.4180.0 |
1,196,320 |
29-Apr-2020 |
17:19 |
|
mscoreei.dll |
4.8.4180.0 |
581,920 |
29-Apr-2020 |
17:19 |
|
mscorlib.dll |
4.8.4180.0 |
5,678,576 |
29-Apr-2020 |
17:19 |
|
Placeholder.dll |
4.8.4180.0 |
26,096 |
29-Apr-2020 |
17:19 |
|
VsVersion.dll |
14.8.4180.0 |
19,232 |
29-Apr-2020 |
17:19 |
|
PenIMC2_v0400.dll |
4.8.4180.0 |
107,504 |
29-Apr-2020 |
17:19 |
|
peverify.dll |
4.8.4180.0 |
190,232 |
29-Apr-2020 |
17:19 |
|
PresentationCore.dll |
4.8.4180.0 |
3,676,440 |
29-Apr-2020 |
17:19 |
|
PresentationFramework.dll |
4.8.4180.0 |
6,271,264 |
29-Apr-2020 |
17:19 |
|
PresentationFramework-SystemData.dll |
4.8.4180.0 |
25,376 |
29-Apr-2020 |
17:19 |
|
PresentationHost_v0400.dll |
4.8.4180.0 |
241,648 |
29-Apr-2020 |
17:19 |
|
PresentationHost_v0400.dll.mui |
4.8.4180.0 |
85,272 |
29-Apr-2020 |
17:19 |
|
PresentationNative_v0400.dll |
4.8.4180.0 |
930,808 |
29-Apr-2020 |
17:19 |
|
ReachFramework.dll |
4.8.4110.0 |
677,656 |
29-Apr-2020 |
17:19 |
|
ServiceMonikerSupport.dll |
4.8.4180.0 |
32,272 |
29-Apr-2020 |
17:19 |
|
SMDiagnostics.dll |
4.8.4180.0 |
73,880 |
29-Apr-2020 |
17:19 |
|
SOS.dll |
4.8.4180.0 |
774,944 |
29-Apr-2020 |
17:19 |
|
System.Activities.dll |
4.8.4180.0 |
1,534,312 |
29-Apr-2020 |
17:19 |
|
System.Activities.Presentation.dll |
4.8.4180.0 |
2,127,136 |
29-Apr-2020 |
17:19 |
|
System.Core.dll |
4.8.4180.0 |
1,556,832 |
29-Apr-2020 |
17:19 |
|
System.IdentityModel.dll |
4.8.4180.0 |
1,094,504 |
29-Apr-2020 |
17:19 |
|
System.IdentityModel.Services.dll |
4.8.4180.0 |
199,152 |
29-Apr-2020 |
17:19 |
|
System.Printing.dll |
4.8.4110.0 |
399,640 |
29-Apr-2020 |
17:19 |
|
System.Runtime.Serialization.dll |
4.8.4180.0 |
1,054,872 |
29-Apr-2020 |
17:19 |
|
System.ServiceModel.Channels.dll |
4.8.4180.0 |
158,704 |
29-Apr-2020 |
17:19 |
|
System.ServiceModel.Discovery.dll |
4.8.4180.0 |
309,024 |
29-Apr-2020 |
17:19 |
|
System.ServiceModel.dll |
4.8.4180.0 |
6,389,336 |
29-Apr-2020 |
17:19 |
|
System.ServiceModel.Internals.dll |
4.8.4180.0 |
254,096 |
29-Apr-2020 |
17:19 |
|
System.ServiceModel.WasHosting.dll |
4.8.4180.0 |
40,736 |
29-Apr-2020 |
17:19 |
|
System.Web.ApplicationServices.dll |
4.8.4075.0 |
71,512 |
29-Apr-2020 |
17:19 |
|
System.Web.Extensions.dll |
4.8.4075.0 |
1,849,992 |
29-Apr-2020 |
17:19 |
|
System.Workflow.Activities.dll |
4.8.4110.0 |
1,051,112 |
29-Apr-2020 |
17:19 |
|
System.Workflow.ComponentModel.dll |
4.8.4110.0 |
1,557,272 |
29-Apr-2020 |
17:19 |
|
System.Workflow.Runtime.dll |
4.8.4110.0 |
503,064 |
29-Apr-2020 |
17:19 |
|
System.dll |
4.8.4001.0 |
3,560,496 |
29-Apr-2020 |
17:19 |
|
System.Web.dll |
4.8.4075.0 |
5,416,728 |
29-Apr-2020 |
17:19 |
|
System.Windows.Controls.Ribbon.dll |
4.8.4180.0 |
751,392 |
29-Apr-2020 |
17:19 |
|
System.Windows.Forms.dll |
4.8.4180.0 |
5,921,848 |
29-Apr-2020 |
17:19 |
|
System.Xaml.dll |
4.8.4180.0 |
640,056 |
29-Apr-2020 |
17:19 |
|
UIAutomationClient.dll |
4.8.4180.0 |
178,464 |
29-Apr-2020 |
17:19 |
|
UIAutomationClientsideProviders.dll |
4.8.4180.0 |
361,760 |
29-Apr-2020 |
17:19 |
|
UIAutomationProvider.dll |
4.8.4180.0 |
49,648 |
29-Apr-2020 |
17:19 |
|
UIAutomationTypes.dll |
4.8.4180.0 |
223,512 |
29-Apr-2020 |
17:19 |
|
webengine.dll |
4.8.4075.0 |
26,904 |
29-Apr-2020 |
17:19 |
|
webengine4.dll |
4.8.4075.0 |
572,184 |
29-Apr-2020 |
17:19 |
|
WindowsBase.dll |
4.8.4180.0 |
1,306,392 |
29-Apr-2020 |
17:19 |
|
WindowsFormsIntegration.dll |
4.8.4180.0 |
105,248 |
29-Apr-2020 |
17:19 |
|
WorkflowServiceHostPerformanceCounters.dll |
4.8.4110.0 |
89,368 |
29-Apr-2020 |
17:19 |
|
WPFFontCache_v0400.exe.mui |
4.8.4180.0 |
19,744 |
29-Apr-2020 |
17:19 |
|
WPFFontCache_v0400.exe |
4.8.4180.0 |
27,472 |
29-Apr-2020 |
17:19 |
|
wpfgfx_v0400.dll |
4.8.4180.0 |
1,626,608 |
29-Apr-2020 |
17:19 |
x64
|
File name |
File version |
File size |
Date |
Time |
|---|---|---|---|---|
|
Aspnet_perf.dll |
4.8.4075.0 |
49,432 |
29-Apr-2020 |
17:19 |
|
Aspnet_perf.dll |
4.8.4075.0 |
43,800 |
29-Apr-2020 |
17:19 |
|
aspnet_wp.exe |
4.8.4075.0 |
53,032 |
29-Apr-2020 |
17:19 |
|
aspnet_wp.exe |
4.8.4075.0 |
47,608 |
29-Apr-2020 |
17:19 |
|
clr.dll |
4.8.4180.0 |
11,251,192 |
29-Apr-2020 |
17:19 |
|
clr.dll |
4.8.4180.0 |
8,044,832 |
29-Apr-2020 |
17:19 |
|
clrjit.dll |
4.8.4180.0 |
1,365,272 |
29-Apr-2020 |
17:19 |
|
clrjit.dll |
4.8.4180.0 |
561,648 |
29-Apr-2020 |
17:19 |
|
compatjit.dll |
4.8.4180.0 |
1,280,800 |
29-Apr-2020 |
17:19 |
|
mscordacwks.dll |
4.8.4180.0 |
1,808,672 |
29-Apr-2020 |
17:19 |
|
mscordacwks.dll |
4.8.4180.0 |
1,315,104 |
29-Apr-2020 |
17:19 |
|
mscordbi.dll |
4.8.4180.0 |
1,662,752 |
29-Apr-2020 |
17:19 |
|
mscordbi.dll |
4.8.4180.0 |
1,196,320 |
29-Apr-2020 |
17:19 |
|
mscoreei.dll |
4.8.4180.0 |
689,952 |
29-Apr-2020 |
17:19 |
|
mscoreei.dll |
4.8.4180.0 |
581,920 |
29-Apr-2020 |
17:19 |
|
mscorlib.dll |
4.8.4180.0 |
5,439,264 |
29-Apr-2020 |
17:19 |
|
mscorlib.dll |
4.8.4180.0 |
5,678,576 |
29-Apr-2020 |
17:19 |
|
VsVersion.dll |
14.8.4180.0 |
19,232 |
29-Apr-2020 |
17:19 |
|
Placeholder.dll |
4.8.4180.0 |
27,936 |
29-Apr-2020 |
17:19 |
|
Placeholder.dll |
4.8.4180.0 |
26,096 |
29-Apr-2020 |
17:19 |
|
VsVersion.dll |
14.8.4180.0 |
19,232 |
29-Apr-2020 |
17:19 |
|
PenIMC2_v0400.dll |
4.8.4180.0 |
128,288 |
29-Apr-2020 |
17:19 |
|
PenIMC2_v0400.dll |
4.8.4180.0 |
107,504 |
29-Apr-2020 |
17:19 |
|
peverify.dll |
4.8.4180.0 |
273,184 |
29-Apr-2020 |
17:19 |
|
peverify.dll |
4.8.4180.0 |
190,232 |
29-Apr-2020 |
17:19 |
|
PresentationCore.dll |
4.8.4180.0 |
3,652,384 |
29-Apr-2020 |
17:19 |
|
PresentationCore.dll |
4.8.4180.0 |
3,676,440 |
29-Apr-2020 |
17:19 |
|
PresentationFramework.dll |
4.8.4180.0 |
6,271,264 |
29-Apr-2020 |
17:19 |
|
PresentationFramework-SystemData.dll |
4.8.4180.0 |
25,376 |
29-Apr-2020 |
17:19 |
|
PresentationHost_v0400.dll |
4.8.4180.0 |
310,048 |
29-Apr-2020 |
17:19 |
|
PresentationHost_v0400.dll.mui |
4.8.4180.0 |
85,280 |
29-Apr-2020 |
17:19 |
|
PresentationHost_v0400.dll |
4.8.4180.0 |
241,648 |
29-Apr-2020 |
17:19 |
|
PresentationHost_v0400.dll.mui |
4.8.4180.0 |
85,272 |
29-Apr-2020 |
17:19 |
|
PresentationNative_v0400.dll |
4.8.4180.0 |
1,171,744 |
29-Apr-2020 |
17:19 |
|
PresentationNative_v0400.dll |
4.8.4180.0 |
930,808 |
29-Apr-2020 |
17:19 |
|
ReachFramework.dll |
4.8.4110.0 |
677,656 |
29-Apr-2020 |
17:19 |
|
ServiceMonikerSupport.dll |
4.8.4180.0 |
35,104 |
29-Apr-2020 |
17:19 |
|
ServiceMonikerSupport.dll |
4.8.4180.0 |
32,272 |
29-Apr-2020 |
17:19 |
|
SMDiagnostics.dll |
4.8.4180.0 |
73,880 |
29-Apr-2020 |
17:19 |
|
SOS.dll |
4.8.4180.0 |
929,056 |
29-Apr-2020 |
17:19 |
|
SOS.dll |
4.8.4180.0 |
774,944 |
29-Apr-2020 |
17:19 |
|
System.Activities.dll |
4.8.4180.0 |
1,534,312 |
29-Apr-2020 |
17:19 |
|
System.Activities.Presentation.dll |
4.8.4180.0 |
2,127,136 |
29-Apr-2020 |
17:19 |
|
System.Core.dll |
4.8.4180.0 |
1,556,832 |
29-Apr-2020 |
17:19 |
|
System.IdentityModel.dll |
4.8.4180.0 |
1,094,504 |
29-Apr-2020 |
17:19 |
|
System.IdentityModel.Services.dll |
4.8.4180.0 |
199,152 |
29-Apr-2020 |
17:19 |
|
System.Printing.dll |
4.8.4110.0 |
400,152 |
29-Apr-2020 |
17:19 |
|
System.Printing.dll |
4.8.4110.0 |
399,640 |
29-Apr-2020 |
17:19 |
|
System.Runtime.Serialization.dll |
4.8.4180.0 |
1,054,872 |
29-Apr-2020 |
17:19 |
|
System.ServiceModel.Channels.dll |
4.8.4180.0 |
158,704 |
29-Apr-2020 |
17:19 |
|
System.ServiceModel.Discovery.dll |
4.8.4180.0 |
309,024 |
29-Apr-2020 |
17:19 |
|
System.ServiceModel.dll |
4.8.4180.0 |
6,389,336 |
29-Apr-2020 |
17:19 |
|
System.ServiceModel.Internals.dll |
4.8.4180.0 |
254,096 |
29-Apr-2020 |
17:19 |
|
System.ServiceModel.WasHosting.dll |
4.8.4180.0 |
40,736 |
29-Apr-2020 |
17:19 |
|
System.Web.ApplicationServices.dll |
4.8.4075.0 |
71,512 |
29-Apr-2020 |
17:19 |
|
System.Web.Extensions.dll |
4.8.4075.0 |
1,849,992 |
29-Apr-2020 |
17:19 |
|
System.Workflow.Activities.dll |
4.8.4110.0 |
1,051,112 |
29-Apr-2020 |
17:19 |
|
System.Workflow.ComponentModel.dll |
4.8.4110.0 |
1,557,272 |
29-Apr-2020 |
17:19 |
|
System.Workflow.Runtime.dll |
4.8.4110.0 |
503,064 |
29-Apr-2020 |
17:19 |
|
System.dll |
4.8.4001.0 |
3,560,496 |
29-Apr-2020 |
17:19 |
|
System.Web.dll |
4.8.4075.0 |
5,403,624 |
29-Apr-2020 |
17:19 |
|
System.Web.dll |
4.8.4075.0 |
5,416,728 |
29-Apr-2020 |
17:19 |
|
System.Windows.Controls.Ribbon.dll |
4.8.4180.0 |
751,392 |
29-Apr-2020 |
17:19 |
|
System.Windows.Forms.dll |
4.8.4180.0 |
5,921,848 |
29-Apr-2020 |
17:19 |
|
System.Xaml.dll |
4.8.4180.0 |
640,056 |
29-Apr-2020 |
17:19 |
|
UIAutomationClient.dll |
4.8.4180.0 |
178,464 |
29-Apr-2020 |
17:19 |
|
UIAutomationClientsideProviders.dll |
4.8.4180.0 |
361,760 |
29-Apr-2020 |
17:19 |
|
UIAutomationProvider.dll |
4.8.4180.0 |
49,648 |
29-Apr-2020 |
17:19 |
|
UIAutomationTypes.dll |
4.8.4180.0 |
223,512 |
29-Apr-2020 |
17:19 |
|
webengine.dll |
4.8.4075.0 |
28,952 |
29-Apr-2020 |
17:19 |
|
webengine.dll |
4.8.4075.0 |
26,904 |
29-Apr-2020 |
17:19 |
|
webengine4.dll |
4.8.4075.0 |
682,776 |
29-Apr-2020 |
17:19 |
|
webengine4.dll |
4.8.4075.0 |
572,184 |
29-Apr-2020 |
17:19 |
|
WindowsBase.dll |
4.8.4180.0 |
1,306,392 |
29-Apr-2020 |
17:19 |
|
WindowsFormsIntegration.dll |
4.8.4180.0 |
105,248 |
29-Apr-2020 |
17:19 |
|
WorkflowServiceHostPerformanceCounters.dll |
4.8.4110.0 |
102,672 |
29-Apr-2020 |
17:19 |
|
WorkflowServiceHostPerformanceCounters.dll |
4.8.4110.0 |
89,368 |
29-Apr-2020 |
17:19 |
|
WPFFontCache_v0400.exe.mui |
4.8.4180.0 |
19,744 |
29-Apr-2020 |
17:19 |
|
WPFFontCache_v0400.exe.mui |
4.8.4180.0 |
19,744 |
29-Apr-2020 |
17:19 |
|
WPFFontCache_v0400.exe |
4.8.4180.0 |
29,520 |
29-Apr-2020 |
17:19 |
|
WPFFontCache_v0400.exe |
4.8.4180.0 |
27,472 |
29-Apr-2020 |
17:19 |
|
wpfgfx_v0400.dll |
4.8.4180.0 |
2,058,016 |
29-Apr-2020 |
17:19 |
|
wpfgfx_v0400.dll |
4.8.4180.0 |
1,626,608 |
29-Apr-2020 |
17:19 |
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
