Applies to:

Microsoft .NET Framework 4.5.2

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).

Important

  • As a reminder to advanced IT administrators, updates to .NET Framework 3.5 for Windows 8.1 and Windows Server 2012 R2 should only be applied on systems where .NET Framework 3.5 is present and enabled. Customers who attempt to pre-install updates to .NET Framework 3.5 to offline images that do not contain the .NET Framework 3.5 product enabled will expose these systems to failures to enable .NET Framework 3.5 after the systems are online. For more extensive information about deploying .NET Framework 3.5, see Microsoft .NET Framework 3.5 Deployment Considerations.

  • All updates for Windows 8.1, Windows RT 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 update

The following articles contain additional information about this update as it relates to individual product versions.

  • 4556405 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 8.1 and Windows Server 2012 R2 (KB4556405)

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:

  1. Select Start, select Administrative Tools, and then select Microsoft Windows Server Update Services 3.0.

  2. Expand ComputerName, and then select Action.

  3. Select Import Updates.

  4. WSUS opens a browser window in which you may be prompted to install an ActiveX control. You must install the ActiveX control to continue.

  5. After the ActiveX control is installed, you see the Microsoft Update Catalog screen. Type 4556405 into the Search box, and then select Search.

  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 require, 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.

Prerequisites

To apply this update, you must have .NET Framework 4.5.2 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 8.1, Windows RT 8.1 and Windows Server 2012 R2 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

Windows8.1-KB4552967-x64.msu

F9AF1464843DD48EF51EF3F0D3DF4831CD1510CE

A17EBAB345E82D7DB6FE2B49F53E6824C1337536D73EA895D8F79D18E7C1339F

Windows8.1-KB4552967-arm.msu

86146108C9542C4B3F56E4091FDC21A009C54D40

B9F8ED28ADCB58513C12D957793BB4EB9BA7C476BC2941DF9419DD8074613880

Windows8.1-KB4552967-x86.msu

FF022A53B00233C9133B6936A88DCE4DD6F9F07C

C5AE33B6DB10D6E63C2F960AEF76796566DFCFB49B87F1C889A63F7917C5E462

For all supported x64-based versions

File name

File version

File size

Date

Time

Platform

Mscorlib.dll

4.0.30319.36627

5,222,688

28-Mar-2020

14:00

x64

Normidna.nlp

Not applicable

59,342

23-Jun-2019

22:15

Not applicable

Normnfc.nlp

Not applicable

47,076

23-Jun-2019

22:15

Not applicable

Normnfd.nlp

Not applicable

40,566

23-Jun-2019

22:15

Not applicable

Normnfkc.nlp

Not applicable

67,808

23-Jun-2019

22:15

Not applicable

Normnfkd.nlp

Not applicable

61,718

23-Jun-2019

22:15

Not applicable

Clrjit.dll

4.0.30319.36627

1,235,232

28-Mar-2020

14:00

x64

Clr.dll

4.0.30319.36627

10,071,328

28-Mar-2020

14:00

x64

Mscordacwks.dll

4.0.30319.36627

1,731,872

28-Mar-2020

14:00

x64

Mscordbi.dll

4.0.30319.36627

1,534,240

28-Mar-2020

14:00

x64

Mscorlib.ni.dll

4.0.30319.36627

22,691,616

28-Mar-2020

14:00

x64

Msvcp120_clr0400.dll

12.0.52627.36627

679,200

28-Mar-2020

14:00

x64

Msvcr120_clr0400.dll

12.0.52627.36627

870,176

28-Mar-2020

14:00

x64

Penimc.dll

4.0.30319.36627

95,736

28-Mar-2020

14:00

x64

Peverify.dll

4.0.30319.36627

226,592

28-Mar-2020

14:00

x64

Presentationframework.dll

4.0.30319.36627

6,228,256

28-Mar-2020

14:00

x86

Presentationhost_v0400.dll.mui

4.0.30319.36627

85,496

28-Mar-2020

14:00

Not applicable

Presentationhost_v0400.dll

4.0.30319.36627

232,944

28-Mar-2020

14:00

x64

Presentationnative_v0400.dll

4.0.30319.36627

1,078,768

28-Mar-2020

14:00

x64

Servicemodel.mof

Not applicable

88,383

23-Jun-2019

22:15

Not applicable

Servicemodel.mof.uninstall

Not applicable

896

23-Jun-2019

22:15

Not applicable

Servicemonikersupport.dll

4.0.30319.36627

29,472

28-Mar-2020

14:00

x64

Smdiagnostics.dll

4.0.30319.36627

73,864

28-Mar-2020

14:00

x86

Sos.dll

4.0.30319.36627

823,792

28-Mar-2020

14:00

x64

System.activities.dll

4.0.30319.36627

1,583,248

28-Mar-2020

14:00

x86

System.core.dll

4.0.30319.36627

1,272,464

28-Mar-2020

14:00

x86

System.identitymodel.services.dll

4.0.30319.36627

200,480

28-Mar-2020

14:00

x86

System.identitymodel.dll

4.0.30319.36627

1,097,872

28-Mar-2020

14:00

x86

System.runtime.serialization.dll

4.0.30319.36627

1,060,496

28-Mar-2020

14:00

x86

System.servicemodel.channels.dll

4.0.30319.36627

160,024

28-Mar-2020

14:00

x86

System.servicemodel.discovery.dll

4.0.30319.36627

313,120

28-Mar-2020

14:00

x86

System.servicemodel.internals.dll

4.0.30319.36627

255,120

28-Mar-2020

14:00

x86

System.servicemodel.washosting.dll

4.0.30319.36627

40,432

28-Mar-2020

14:00

x86

System.servicemodel.dll

4.0.30319.36627

6,388,328

28-Mar-2020

14:00

x86

System.windows.controls.ribbon.dll

4.0.30319.36627

751,904

28-Mar-2020

14:00

x86

System.xaml.dll

4.0.30319.36627

641,408

28-Mar-2020

14:00

x86

Windowsbase.dll

4.0.30319.36627

1,242,392

28-Mar-2020

14:00

x86

Wpfgfx_v0400.dll

4.0.30319.36627

2,109,424

28-Mar-2020

14:00

x64

Presentationcore.dll

4.0.30319.36627

3,211,552

28-Mar-2020

14:00

x64

Presentationframework.dll

4.0.30319.36627

6,228,256

28-Mar-2020

13:37

x86

Smdiagnostics.dll

4.0.30319.36627

73,864

28-Mar-2020

13:37

x86

System.activities.dll

4.0.30319.36627

1,583,248

28-Mar-2020

13:37

x86

System.core.dll

4.0.30319.36627

1,272,464

28-Mar-2020

13:37

x86

System.identitymodel.services.dll

4.0.30319.36627

200,480

28-Mar-2020

13:37

x86

System.identitymodel.dll

4.0.30319.36627

1,097,872

28-Mar-2020

13:37

x86

System.runtime.serialization.dll

4.0.30319.36627

1,060,496

28-Mar-2020

13:37

x86

System.servicemodel.channels.dll

4.0.30319.36627

160,024

28-Mar-2020

13:37

x86

System.servicemodel.discovery.dll

4.0.30319.36627

313,120

28-Mar-2020

13:37

x86

System.servicemodel.internals.dll

4.0.30319.36627

255,120

28-Mar-2020

13:37

x86

System.servicemodel.washosting.dll

4.0.30319.36627

40,432

28-Mar-2020

13:37

x86

System.servicemodel.dll

4.0.30319.36627

6,388,328

28-Mar-2020

13:37

x86

System.windows.controls.ribbon.dll

4.0.30319.36627

751,904

28-Mar-2020

13:37

x86

System.xaml.dll

4.0.30319.36627

641,408

28-Mar-2020

13:37

x86

Windowsbase.dll

4.0.30319.36627

1,242,392

28-Mar-2020

13:37

x86

Mscorlib.dll

4.0.30319.36627

5,268,768

28-Mar-2020

13:37

x86

Normidna.nlp

Not applicable

59,342

27-Oct-2017

23:27

Not applicable

Normnfc.nlp

Not applicable

47,076

27-Oct-2017

23:27

Not applicable

Normnfd.nlp

Not applicable

40,566

27-Oct-2017

23:27

Not applicable

Normnfkc.nlp

Not applicable

67,808

27-Oct-2017

23:27

Not applicable

Normnfkd.nlp

Not applicable

61,718

27-Oct-2017

23:27

Not applicable

Clrjit.dll

4.0.30319.36627

509,728

28-Mar-2020

13:37

x86

Clr.dll

4.0.30319.36627

6,941,472

28-Mar-2020

13:37

x86

Mscordacwks.dll

4.0.30319.36627

1,285,104

28-Mar-2020

13:37

x86

Mscordbi.dll

4.0.30319.36627

1,108,464

28-Mar-2020

13:37

x86

Mscorlib.ni.dll

4.0.30319.36627

17,236,976

28-Mar-2020

13:37

x86

Msvcp120_clr0400.dll

12.0.52627.36627

537,376

28-Mar-2020

13:37

x86

Msvcr120_clr0400.dll

12.0.52627.36627

876,528

28-Mar-2020

13:37

x86

Penimc.dll

4.0.30319.36627

82,440

28-Mar-2020

13:37

x86

Peverify.dll

4.0.30319.36627

164,640

28-Mar-2020

13:37

x86

Presentationhost_v0400.dll.mui

4.0.30319.36627

85,488

28-Mar-2020

13:37

Not applicable

Presentationhost_v0400.dll

4.0.30319.36627

186,864

28-Mar-2020

13:37

x86

Presentationnative_v0400.dll

4.0.30319.36627

790,816

28-Mar-2020

13:37

x86

Servicemonikersupport.dll

4.0.30319.36627

28,960

28-Mar-2020

13:37

x86

Sos.dll

4.0.30319.36627

763,168

28-Mar-2020

13:37

x86

System.core.dll

4.0.30319.36627

1,272,464

28-Mar-2020

13:37

x86

Wpfgfx_v0400.dll

4.0.30319.36627

1,649,136

28-Mar-2020

13:37

x86

Presentationcore.dll

4.0.30319.36627

3,227,632

28-Mar-2020

13:37

x86

For all supported ARM-based versions

File name

File version

File size

Date

Time

Platform

Mscorlib.dll

4.0.30319.36627

5,269,256

28-Mar-2020

17:37

Not applicable

Normidna.nlp

Not applicable

59,342

13-Sep-2019

18:09

Not applicable

Normnfc.nlp

Not applicable

47,076

13-Sep-2019

18:09

Not applicable

Normnfd.nlp

Not applicable

40,566

13-Sep-2019

18:09

Not applicable

Normnfkc.nlp

Not applicable

67,808

13-Sep-2019

18:09

Not applicable

Normnfkd.nlp

Not applicable

61,718

13-Sep-2019

18:09

Not applicable

Clrjit.dll

4.0.30319.36627

626,352

28-Mar-2020

17:37

Not applicable

Clr.dll

4.0.30319.36627

7,103,960

28-Mar-2020

17:37

Not applicable

Mscordacwks.dll

4.0.30319.36627

1,305,776

28-Mar-2020

17:37

Not applicable

Mscordbi.dll

4.0.30319.36627

1,120,216

28-Mar-2020

17:37

Not applicable

Mscorlib.ni.dll

4.0.30319.36627

17,566,984

28-Mar-2020

17:37

Not applicable

Msvcp120_clr0400.dll

12.0.52627.36627

602,288

28-Mar-2020

17:37

Not applicable

Msvcr120_clr0400.dll

12.0.52627.36627

634,120

28-Mar-2020

17:37

Not applicable

Sos.dll

4.0.30319.36627

666,584

28-Mar-2020

17:37

Not applicable

System.core.dll

4.0.30319.36627

1,272,464

28-Mar-2020

17:37

x86

Smdiagnostics.dll

4.0.30319.36627

73,864

28-Mar-2020

17:37

x86

System.activities.dll

4.0.30319.36627

1,583,248

28-Mar-2020

17:37

x86

System.core.dll

4.0.30319.36627

1,272,464

28-Mar-2020

17:37

x86

System.identitymodel.dll

4.0.30319.36627

1,097,872

28-Mar-2020

17:37

x86

System.runtime.serialization.dll

4.0.30319.36627

1,060,496

28-Mar-2020

17:37

x86

System.servicemodel.internals.dll

4.0.30319.36627

255,120

28-Mar-2020

17:37

x86

System.servicemodel.dll

4.0.30319.36627

6,388,328

28-Mar-2020

17:37

x86

System.xaml.dll

4.0.30319.36627

641,408

28-Mar-2020

17:37

x86

For all supported x86-based versions

File name

File version

File size

Date

Time

Platform

Presentationframework.dll

4.0.30319.36627

6,228,256

28-Mar-2020

13:37

x86

Smdiagnostics.dll

4.0.30319.36627

73,864

28-Mar-2020

13:37

x86

System.activities.dll

4.0.30319.36627

1,583,248

28-Mar-2020

13:37

x86

System.core.dll

4.0.30319.36627

1,272,464

28-Mar-2020

13:37

x86

System.identitymodel.services.dll

4.0.30319.36627

200,480

28-Mar-2020

13:37

x86

System.identitymodel.dll

4.0.30319.36627

1,097,872

28-Mar-2020

13:37

x86

System.runtime.serialization.dll

4.0.30319.36627

1,060,496

28-Mar-2020

13:37

x86

System.servicemodel.channels.dll

4.0.30319.36627

160,024

28-Mar-2020

13:37

x86

System.servicemodel.discovery.dll

4.0.30319.36627

313,120

28-Mar-2020

13:37

x86

System.servicemodel.internals.dll

4.0.30319.36627

255,120

28-Mar-2020

13:37

x86

System.servicemodel.washosting.dll

4.0.30319.36627

40,432

28-Mar-2020

13:37

x86

System.servicemodel.dll

4.0.30319.36627

6,388,328

28-Mar-2020

13:37

x86

System.windows.controls.ribbon.dll

4.0.30319.36627

751,904

28-Mar-2020

13:37

x86

System.xaml.dll

4.0.30319.36627

641,408

28-Mar-2020

13:37

x86

Windowsbase.dll

4.0.30319.36627

1,242,392

28-Mar-2020

13:37

x86

Mscorlib.dll

4.0.30319.36627

5,268,768

28-Mar-2020

13:37

x86

Normidna.nlp

Not applicable

59,342

27-Oct-2017

23:27

Not applicable

Normnfc.nlp

Not applicable

47,076

27-Oct-2017

23:27

Not applicable

Normnfd.nlp

Not applicable

40,566

27-Oct-2017

23:27

Not applicable

Normnfkc.nlp

Not applicable

67,808

27-Oct-2017

23:27

Not applicable

Normnfkd.nlp

Not applicable

61,718

27-Oct-2017

23:27

Not applicable

Clrjit.dll

4.0.30319.36627

509,728

28-Mar-2020

13:37

x86

Clr.dll

4.0.30319.36627

6,941,472

28-Mar-2020

13:37

x86

Mscordacwks.dll

4.0.30319.36627

1,285,104

28-Mar-2020

13:37

x86

Mscordbi.dll

4.0.30319.36627

1,108,464

28-Mar-2020

13:37

x86

Mscorlib.ni.dll

4.0.30319.36627

17,236,976

28-Mar-2020

13:37

x86

Msvcp120_clr0400.dll

12.0.52627.36627

537,376

28-Mar-2020

13:37

x86

Msvcr120_clr0400.dll

12.0.52627.36627

876,528

28-Mar-2020

13:37

x86

Penimc.dll

4.0.30319.36627

82,440

28-Mar-2020

13:37

x86

Peverify.dll

4.0.30319.36627

164,640

28-Mar-2020

13:37

x86

Presentationhost_v0400.dll.mui

4.0.30319.36627

85,488

28-Mar-2020

13:37

Not applicable

Presentationhost_v0400.dll

4.0.30319.36627

186,864

28-Mar-2020

13:37

x86

Presentationnative_v0400.dll

4.0.30319.36627

790,816

28-Mar-2020

13:37

x86

Servicemodel.mof

Not applicable

88,383

27-Oct-2017

23:27

Not applicable

Servicemodel.mof.uninstall

Not applicable

896

27-Oct-2017

23:27

Not applicable

Servicemonikersupport.dll

4.0.30319.36627

28,960

28-Mar-2020

13:37

x86

Sos.dll

4.0.30319.36627

763,168

28-Mar-2020

13:37

x86

System.core.dll

4.0.30319.36627

1,272,464

28-Mar-2020

13:37

x86

Wpfgfx_v0400.dll

4.0.30319.36627

1,649,136

28-Mar-2020

13:37

x86

Presentationcore.dll

4.0.30319.36627

3,227,632

28-Mar-2020

13:37

x86

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