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.

Summary

An elevation of privilege vulnerability exists in .NET Framework which could allow an attacker to elevate their privilege level. To exploit the vulnerability, an attacker would first have to access the local machine, and then run a malicious program. The update addresses the vulnerability by correcting how .NET Framework activates COM objects.

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.

  • 4556403 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 (KB4556403)

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.

  1. 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.

  2. 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.

  3. 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:

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 7 and Windows Server 2008 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

Windows6.1-KB4552965-x64.msu

658EDD28F8BDADB60DC4EED3BF41ED7075BD79EF

3CABD0D4647E40C65E22B0AAF2C39F32E83F8778EA7085CB240BE5667B07377A

Windows6.1-KB4552965-x86.msu

BE009FEC8645464CC8729912E88E17026FDBCB02

6745BA0C780256C4887097583E865D28F7F02406546B29AA6E7A20F53C81BC66

For all supported x64-based versions

File name

File version

File size

Date

Time

Platform

Infocard.exe

3.0.4506.8841

869,392

16-Apr-2020

00:37

x64

Big5.nlp

Not applicable

66,728

18-Nov-2018

02:42

Not applicable

Bopomofo.nlp

Not applicable

82,172

18-Nov-2018

02:42

Not applicable

Ksc.nlp

Not applicable

116,756

18-Nov-2018

02:42

Not applicable

Mscorlib.dll

2.0.50727.8813

4,575,232

16-Apr-2020

00:37

x64

Normidna.nlp

Not applicable

59,342

18-Nov-2018

02:43

Not applicable

Normnfc.nlp

Not applicable

45,794

18-Nov-2018

02:43

Not applicable

Normnfd.nlp

Not applicable

39,284

18-Nov-2018

02:43

Not applicable

Normnfkc.nlp

Not applicable

66,384

18-Nov-2018

02:43

Not applicable

Normnfkd.nlp

Not applicable

60,294

18-Nov-2018

02:43

Not applicable

Prc.nlp

Not applicable

83,748

18-Nov-2018

02:43

Not applicable

Prcp.nlp

Not applicable

83,748

18-Nov-2018

02:43

Not applicable

Sortkey.nlp

Not applicable

262,148

18-Nov-2018

02:43

Not applicable

Sorttbls.nlp

Not applicable

20,320

18-Nov-2018

02:43

Not applicable

Xjis.nlp

Not applicable

28,288

18-Nov-2018

02:43

Not applicable

Mscordacwks.dll

2.0.50727.8813

1,758,088

16-Apr-2020

00:37

x64

Mscorwks.dll

2.0.50727.8813

10,011,528

16-Apr-2020

00:37

x64

Sos.dll

2.0.50727.8813

486,792

16-Apr-2020

00:37

x64

Servicemodel.mof

Not applicable

85,113

18-Nov-2018

02:41

Not applicable

Servicemodel.mof.uninstall

Not applicable

896

18-Nov-2018

02:41

Not applicable

Servicemonikersupport.dll

3.0.4506.8841

30,192

16-Apr-2020

00:37

x64

Smdiagnostics.dll

3.0.4506.8841

94,208

16-Apr-2020

00:37

x86

Smsvchost.exe

3.0.4506.8841

127,488

16-Apr-2020

00:37

x86

System.identitymodel.dll

3.0.4506.8841

405,504

16-Apr-2020

00:37

x86

System.runtime.serialization.dll

3.0.4506.8841

847,872

16-Apr-2020

00:37

x86

System.runtime.serialization.dll

3.0.4506.8841

847,872

16-Apr-2020

00:37

x86

System.servicemodel.dll

3.0.4506.8841

5,337,088

16-Apr-2020

00:37

x86

System.servicemodel.washosting.dll

3.0.4506.8841

32,768

16-Apr-2020

00:37

x86

System.servicemodel.dll

3.0.4506.8841

5,337,088

16-Apr-2020

00:37

x86

Smdiagnostics.dll

3.0.4506.8841

110,592

16-Apr-2020

00:37

x86

Smsvchost.exe

3.0.4506.8841

139,568

16-Apr-2020

00:37

x86

System.identitymodel.dll

3.0.4506.8841

446,464

16-Apr-2020

00:37

x86

System.runtime.serialization.dll

3.0.4506.8841

970,752

16-Apr-2020

00:37

x86

System.runtime.serialization.dll

3.0.4506.8841

970,752

16-Apr-2020

00:37

x86

System.servicemodel.dll

3.0.4506.8841

5,996,544

16-Apr-2020

00:37

x86

System.servicemodel.washosting.dll

3.0.4506.8841

32,768

16-Apr-2020

00:37

x86

System.servicemodel.dll

3.0.4506.8841

5,996,544

16-Apr-2020

00:37

x86

Infocard.exe

3.0.4506.8841

889,152

16-Apr-2020

00:37

x86

Big5.nlp

Not applicable

66,728

26-Nov-2019

20:25

Not applicable

Bopomofo.nlp

Not applicable

82,172

26-Nov-2019

20:25

Not applicable

Ksc.nlp

Not applicable

116,756

26-Nov-2019

20:25

Not applicable

Mscorlib.dll

2.0.50727.8813

4,558,848

16-Apr-2020

00:37

x86

Normidna.nlp

Not applicable

59,342

26-Nov-2019

20:25

Not applicable

Normnfc.nlp

Not applicable

45,794

26-Nov-2019

20:25

Not applicable

Normnfd.nlp

Not applicable

39,284

26-Nov-2019

20:25

Not applicable

Normnfkc.nlp

Not applicable

66,384

26-Nov-2019

20:25

Not applicable

Normnfkd.nlp

Not applicable

60,294

26-Nov-2019

20:25

Not applicable

Prc.nlp

Not applicable

83,748

26-Nov-2019

20:25

Not applicable

Prcp.nlp

Not applicable

83,748

26-Nov-2019

20:25

Not applicable

Sortkey.nlp

Not applicable

262,148

26-Nov-2019

20:25

Not applicable

Sorttbls.nlp

Not applicable

20,320

26-Nov-2019

20:25

Not applicable

Xjis.nlp

Not applicable

28,288

26-Nov-2019

20:25

Not applicable

Mscordacwks.dll

2.0.50727.8813

991,112

16-Apr-2020

00:37

x86

Mscorwks.dll

2.0.50727.8813

5,949,832

16-Apr-2020

00:37

x86

Sos.dll

2.0.50727.8813

390,536

16-Apr-2020

00:37

x86

Servicemodel.mof

Not applicable

85,113

26-Nov-2019

20:21

Not applicable

Servicemodel.mof.uninstall

Not applicable

896

26-Nov-2019

20:21

Not applicable

Servicemonikersupport.dll

3.0.4506.8841

28,152

16-Apr-2020

00:37

x86

System.identitymodel.dll

3.0.4506.8841

446,464

16-Apr-2020

00:37

x86

System.runtime.serialization.dll

3.0.4506.8841

970,752

16-Apr-2020

00:37

x86

System.servicemodel.dll

3.0.4506.8841

5,996,544

16-Apr-2020

00:37

x86

For all supported x86-based versions

File name

File version

File size

Date

Time

Platform

Smdiagnostics.dll

3.0.4506.8841

110,592

16-Apr-2020

00:37

x86

Smsvchost.exe

3.0.4506.8841

139,568

16-Apr-2020

00:37

x86

System.identitymodel.dll

3.0.4506.8841

446,464

16-Apr-2020

00:37

x86

System.runtime.serialization.dll

3.0.4506.8841

970,752

16-Apr-2020

00:37

x86

System.runtime.serialization.dll

3.0.4506.8841

970,752

16-Apr-2020

00:37

x86

System.servicemodel.dll

3.0.4506.8841

5,996,544

16-Apr-2020

00:37

x86

System.servicemodel.washosting.dll

3.0.4506.8841

32,768

16-Apr-2020

00:37

x86

System.servicemodel.dll

3.0.4506.8841

5,996,544

16-Apr-2020

00:37

x86

Infocard.exe

3.0.4506.8841

889,152

16-Apr-2020

00:37

x86

Big5.nlp

Not applicable

66,728

26-Nov-2019

20:25

Not applicable

Bopomofo.nlp

Not applicable

82,172

26-Nov-2019

20:25

Not applicable

Ksc.nlp

Not applicable

116,756

26-Nov-2019

20:25

Not applicable

Mscorlib.dll

2.0.50727.8813

4,558,848

16-Apr-2020

00:37

x86

Normidna.nlp

Not applicable

59,342

26-Nov-2019

20:25

Not applicable

Normnfc.nlp

Not applicable

45,794

26-Nov-2019

20:25

Not applicable

Normnfd.nlp

Not applicable

39,284

26-Nov-2019

20:25

Not applicable

Normnfkc.nlp

Not applicable

66,384

26-Nov-2019

20:25

Not applicable

Normnfkd.nlp

Not applicable

60,294

26-Nov-2019

20:25

Not applicable

Prc.nlp

Not applicable

83,748

26-Nov-2019

20:25

Not applicable

Prcp.nlp

Not applicable

83,748

26-Nov-2019

20:25

Not applicable

Sortkey.nlp

Not applicable

262,148

26-Nov-2019

20:25

Not applicable

Sorttbls.nlp

Not applicable

20,320

26-Nov-2019

20:25

Not applicable

Xjis.nlp

Not applicable

28,288

26-Nov-2019

20:25

Not applicable

Mscordacwks.dll

2.0.50727.8813

991,112

16-Apr-2020

00:37

x86

Mscorwks.dll

2.0.50727.8813

5,949,832

16-Apr-2020

00:37

x86

Sos.dll

2.0.50727.8813

390,536

16-Apr-2020

00:37

x86

Servicemodel.mof

Not applicable

85,113

26-Nov-2019

20:21

Not applicable

Servicemodel.mof.uninstall

Not applicable

896

26-Nov-2019

20:21

Not applicable

Servicemonikersupport.dll

3.0.4506.8841

28,152

16-Apr-2020

00:37

x86

System.identitymodel.dll

3.0.4506.8841

446,464

16-Apr-2020

00:37

x86

System.runtime.serialization.dll

3.0.4506.8841

970,752

16-Apr-2020

00:37

x86

System.servicemodel.dll

3.0.4506.8841

5,996,544

16-Apr-2020

00:37

x86

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