Applies to:
Microsoft .NET Framework 4.8
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).
Additional information about this update
The following articles contain additional information about this update as it relates to individual product versions.
-
4556404 Description of the Security Only Update for .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows Server 2012 (KB4556404)
How to obtain and install the update
Method 1: Microsoft Update Catalog
To get the standalone package for this update, go to the Microsoft Update Catalog website.
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. You must install the ActiveX control to continue.
-
After the ActiveX control is installed, you see the Microsoft Update Catalog screen. Type 4556404 into 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 require, 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.
Prerequisites
To apply this update, you must have .NET Framework 4.8 installed.
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.
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 Server 2012 file information
Note: 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 |
|---|---|---|
|
Windows8-RT-KB4552961-x64-NDP48.msu |
4E40802E269FE7D52DB77E53254553D4C348BB66 |
B0C3BDF8481571D13270C82F3AE2F62382B2B57FFA07F1500C8D5B32D280A74D |
For all supported x64-based versions
|
File name |
File version |
File size |
Date |
Time |
Platform |
SP requirement |
Service branch |
|
Mscorlib.dll |
4.8.4180.0 |
5,439,264 |
26-Mar-2020 |
23:10 |
x64 |
None |
Not applicable |
|
Normidna.nlp |
Not applicable |
59,342 |
02-Aug-2018 |
01:29 |
Not applicable |
None |
Not applicable |
|
Normnfc.nlp |
Not applicable |
47,076 |
02-Aug-2018 |
01:29 |
Not applicable |
None |
Not applicable |
|
Normnfd.nlp |
Not applicable |
40,566 |
02-Aug-2018 |
01:29 |
Not applicable |
None |
Not applicable |
|
Normnfkc.nlp |
Not applicable |
67,808 |
02-Aug-2018 |
01:29 |
Not applicable |
None |
Not applicable |
|
Normnfkd.nlp |
Not applicable |
61,718 |
02-Aug-2018 |
01:29 |
Not applicable |
None |
Not applicable |
|
Clrjit.dll |
4.8.4180.0 |
1,365,272 |
26-Mar-2020 |
23:10 |
x64 |
None |
Not applicable |
|
Clr.dll |
4.8.4180.0 |
11,251,192 |
26-Mar-2020 |
23:10 |
x64 |
None |
Not applicable |
|
Compatjit.dll |
4.8.4180.0 |
1,280,800 |
26-Mar-2020 |
23:10 |
x64 |
None |
Not applicable |
|
Globalmonospace.compositefont |
Not applicable |
26,040 |
31-Jul-2019 |
02:08 |
Not applicable |
SPA |
AMD64_NETFX4-GLOBALMONOSP |
|
Globalsansserif.compositefont |
Not applicable |
26,489 |
31-Jul-2019 |
02:08 |
Not applicable |
None |
Not applicable |
|
Globalserif.compositefont |
Not applicable |
29,779 |
31-Jul-2019 |
02:08 |
Not applicable |
None |
Not applicable |
|
Globaluserinterface.compositefont |
Not applicable |
264,986 |
03-Feb-2020 |
10:17 |
Not applicable |
None |
Not applicable |
|
Mscordacwks.dll |
4.8.4180.0 |
1,808,672 |
26-Mar-2020 |
23:10 |
x64 |
None |
Not applicable |
|
Mscordbi.dll |
4.8.4180.0 |
1,662,752 |
26-Mar-2020 |
23:10 |
x64 |
None |
Not applicable |
|
Mscoreei.dll |
4.8.4180.0 |
689,952 |
26-Mar-2020 |
23:10 |
x64 |
None |
Not applicable |
|
Penimc.dll |
14.8.4180.0 |
19,232 |
26-Mar-2020 |
23:10 |
x64 |
None |
Not applicable |
|
Penimc2_v0400.dll |
4.8.4180.0 |
128,288 |
26-Mar-2020 |
23:10 |
x64 |
None |
Not applicable |
|
Penimc_v0400.dll |
4.8.4180.0 |
27,936 |
26-Mar-2020 |
23:10 |
x64 |
None |
Not applicable |
|
Peverify.dll |
4.8.4180.0 |
273,184 |
26-Mar-2020 |
23:10 |
x64 |
None |
Not applicable |
|
Presentationframework-systemdata.dll |
4.8.4180.0 |
25,376 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Presentationframework.dll |
4.8.4180.0 |
6,271,264 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Presentationhost_v0400.dll.mui |
4.8.4180.0 |
85,280 |
26-Mar-2020 |
23:10 |
Not applicable |
None |
Not applicable |
|
Presentationhost_v0400.dll |
4.8.4180.0 |
310,048 |
26-Mar-2020 |
23:10 |
x64 |
None |
Not applicable |
|
Presentationnative_v0400.dll |
4.8.4180.0 |
1,171,744 |
26-Mar-2020 |
23:10 |
x64 |
None |
Not applicable |
|
Servicemodel.mof |
Not applicable |
88,383 |
03-Feb-2020 |
13:12 |
Not applicable |
None |
Not applicable |
|
Servicemodel.mof.uninstall |
Not applicable |
896 |
03-Feb-2020 |
13:12 |
Not applicable |
None |
Not applicable |
|
Servicemonikersupport.dll |
4.8.4180.0 |
35,104 |
26-Mar-2020 |
23:10 |
x64 |
None |
Not applicable |
|
Smdiagnostics.dll |
4.8.4180.0 |
73,880 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Sos.dll |
4.8.4180.0 |
929,056 |
26-Mar-2020 |
23:10 |
x64 |
None |
Not applicable |
|
System.activities.dll |
4.8.4180.0 |
1,534,312 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.core.dll |
4.8.4180.0 |
1,556,832 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.identitymodel.services.dll |
4.8.4180.0 |
199,152 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.identitymodel.dll |
4.8.4180.0 |
1,094,504 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.runtime.serialization.dll |
4.8.4180.0 |
1,054,872 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.servicemodel.channels.dll |
4.8.4180.0 |
158,704 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.servicemodel.discovery.dll |
4.8.4180.0 |
309,024 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.servicemodel.internals.dll |
4.8.4180.0 |
254,096 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.servicemodel.washosting.dll |
4.8.4180.0 |
40,736 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.servicemodel.dll |
4.8.4180.0 |
6,389,336 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.windows.controls.ribbon.dll |
4.8.4180.0 |
751,392 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.xaml.dll |
4.8.4180.0 |
640,056 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Uiautomationclientsideproviders.dll |
4.8.4180.0 |
361,760 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Uiautomationclient.dll |
4.8.4180.0 |
178,464 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Uiautomationprovider.dll |
4.8.4180.0 |
49,648 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Uiautomationtypes.dll |
4.8.4180.0 |
223,512 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Windowsbase.dll |
4.8.4180.0 |
1,306,392 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Wpfgfx_v0400.dll |
4.8.4180.0 |
2,058,016 |
26-Mar-2020 |
23:10 |
x64 |
None |
Not applicable |
|
Globalmonospace.compositefont |
Not applicable |
26,040 |
03-Feb-2020 |
13:25 |
Not applicable |
None |
Not applicable |
|
Globalsansserif.compositefont |
Not applicable |
26,489 |
03-Feb-2020 |
13:25 |
Not applicable |
None |
Not applicable |
|
Globalserif.compositefont |
Not applicable |
29,779 |
03-Feb-2020 |
13:25 |
Not applicable |
None |
Not applicable |
|
Globaluserinterface.compositefont |
Not applicable |
264,986 |
03-Feb-2020 |
13:25 |
Not applicable |
None |
Not applicable |
|
Presentationcore.dll |
4.8.4180.0 |
3,652,384 |
26-Mar-2020 |
23:10 |
x64 |
None |
Not applicable |
|
Presentationframework-systemdata.dll |
4.8.4180.0 |
25,376 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Presentationframework.dll |
4.8.4180.0 |
6,271,264 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Smdiagnostics.dll |
4.8.4180.0 |
73,880 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.activities.dll |
4.8.4180.0 |
1,534,312 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.core.dll |
4.8.4180.0 |
1,556,832 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.identitymodel.services.dll |
4.8.4180.0 |
199,152 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.identitymodel.dll |
4.8.4180.0 |
1,094,504 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.runtime.serialization.dll |
4.8.4180.0 |
1,054,872 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.servicemodel.channels.dll |
4.8.4180.0 |
158,704 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.servicemodel.discovery.dll |
4.8.4180.0 |
309,024 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.servicemodel.internals.dll |
4.8.4180.0 |
254,096 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.servicemodel.washosting.dll |
4.8.4180.0 |
40,736 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.servicemodel.dll |
4.8.4180.0 |
6,389,336 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.windows.controls.ribbon.dll |
4.8.4180.0 |
751,392 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.xaml.dll |
4.8.4180.0 |
640,056 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Uiautomationclientsideproviders.dll |
4.8.4180.0 |
361,760 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Uiautomationclient.dll |
4.8.4180.0 |
178,464 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Uiautomationprovider.dll |
4.8.4180.0 |
49,648 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Uiautomationtypes.dll |
4.8.4180.0 |
223,512 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Windowsbase.dll |
4.8.4180.0 |
1,306,392 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Mscorlib.dll |
4.8.4180.0 |
5,678,576 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Normidna.nlp |
Not applicable |
59,342 |
02-Aug-2018 |
01:29 |
Not applicable |
None |
Not applicable |
|
Normnfc.nlp |
Not applicable |
47,076 |
02-Aug-2018 |
01:29 |
Not applicable |
None |
Not applicable |
|
Normnfd.nlp |
Not applicable |
40,566 |
02-Aug-2018 |
01:29 |
Not applicable |
None |
Not applicable |
|
Normnfkc.nlp |
Not applicable |
67,808 |
02-Aug-2018 |
01:29 |
Not applicable |
None |
Not applicable |
|
Normnfkd.nlp |
Not applicable |
61,718 |
02-Aug-2018 |
01:29 |
Not applicable |
None |
Not applicable |
|
Clrjit.dll |
4.8.4180.0 |
561,648 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Clr.dll |
4.8.4180.0 |
8,044,832 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Globalmonospace.compositefont |
Not applicable |
26,040 |
31-Jul-2019 |
02:08 |
Not applicable |
SPA |
X86_NETFX4-GLOBALMONOSP |
|
Globalsansserif.compositefont |
Not applicable |
26,489 |
31-Jul-2019 |
02:08 |
Not applicable |
None |
Not applicable |
|
Globalserif.compositefont |
Not applicable |
29,779 |
31-Jul-2019 |
02:08 |
Not applicable |
None |
Not applicable |
|
Globaluserinterface.compositefont |
Not applicable |
264,986 |
03-Feb-2020 |
10:17 |
Not applicable |
None |
Not applicable |
|
Mscordacwks.dll |
4.8.4180.0 |
1,315,104 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Mscordbi.dll |
4.8.4180.0 |
1,196,320 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Mscoreei.dll |
4.8.4180.0 |
581,920 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Penimc.dll |
14.8.4180.0 |
19,232 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Penimc2_v0400.dll |
4.8.4180.0 |
107,504 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Penimc_v0400.dll |
4.8.4180.0 |
26,096 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Peverify.dll |
4.8.4180.0 |
190,232 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Presentationhost_v0400.dll.mui |
4.8.4180.0 |
85,272 |
26-Mar-2020 |
23:11 |
Not applicable |
None |
Not applicable |
|
Presentationhost_v0400.dll |
4.8.4180.0 |
241,648 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Presentationnative_v0400.dll |
4.8.4180.0 |
930,808 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Servicemonikersupport.dll |
4.8.4180.0 |
32,272 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Sos.dll |
4.8.4180.0 |
774,944 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
System.core.dll |
4.8.4180.0 |
1,556,832 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Wpfgfx_v0400.dll |
4.8.4180.0 |
1,626,608 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
|
Globalmonospace.compositefont |
Not applicable |
26,040 |
31-Jul-2019 |
02:08 |
Not applicable |
None |
Not applicable |
|
Globalsansserif.compositefont |
Not applicable |
26,489 |
31-Jul-2019 |
02:08 |
Not applicable |
None |
Not applicable |
|
Globalserif.compositefont |
Not applicable |
29,779 |
31-Jul-2019 |
02:08 |
Not applicable |
None |
Not applicable |
|
Globaluserinterface.compositefont |
Not applicable |
264,986 |
03-Feb-2020 |
10:17 |
Not applicable |
None |
Not applicable |
|
Presentationcore.dll |
4.8.4180.0 |
3,676,440 |
26-Mar-2020 |
23:11 |
x86 |
None |
Not applicable |
Information about protection and security
-
Protect yourself online: Windows Security support
-
Learn how we guard against cyber threats: Microsoft Security
