Notice: This website is an unofficial Microsoft Knowledge Base (hereinafter KB) archive and is intended to provide a reliable access to deleted content from Microsoft KB. All KB articles are owned by Microsoft Corporation. Read full disclaimer for more details.

Description of the Security Only update for .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, and 4.7.1 for Windows Server 2012 (KB 4054181)


View products that this article applies to.

Summary

This security update resolves a security feature bypass vulnerability that exists when Microsoft .NET Framework and .NET Core components do not completely validate certificates. This security update addresses the vulnerability by helping to make sure that .NET Framework and .NET Core components completely validate certificates. To learn more about this vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2018-0786.

Additionally, this security update resolves a Denial of Service vulnerability that exists when .NET Framework and .NET core components improperly process XML documents. This update addresses the vulnerability by correcting how .NET Framework and .NET Core component applications handle XML document processing. To learn more about this vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2018-0764.

↑ Back to the top


Important

  • All updates for .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, and 4.7.1 require that the d3dcompiler_47.dll be installed. We recommend that you install the included d3dcompiler_47.dll before you apply this update. For more information about the d3dcompiler_47.dll, see KB 4019990.
  • 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.

↑ Back to the top


Additional information about this security update

  • Enhanced Key Usage (EKU) is described in RFC 5280 in section 4.2.1.12. This extension indicates one or more purposes for which the certified public key may be used, in addition to or instead of the basic purposes that are indicated in the key usage extension. For example, a certificate that is used for the authentication of a client to a server must be configured for Client Authentication. Similarly, a certificate that is used for the authentication of a server must be configured for Server Authentication. With this change, besides requiring the appropriate client/server EKU on certificates, if the root certificate is disabled, the certificate chain validation will fail.

    When certificates are used for authentication, the authenticator examines the certificate that is provided by the remote endpoint and seeks the correct purpose object identifier in Application Policies extensions. When a certificate is used for client authentication, the object identifier for Client Authentication must be present in the EKU extensions of the certificate, or authentication fails. The object identifier for Client Authentication is 1.3.6.1.5.5.7.3.2. Likewise, when a certificate is used for server authentication, the object identifier for Server Authentication must be present in the EKU extensions of the certificate, or authentication fails. The object identifier for Server Authentication is 1.3.6.1.5.5.7.3.1. Certificates that have no EKU extension continue to authenticate correctly.

    First, consider making changes to your component’s certificates to make sure that they are using the correct EKU OID attributes and are secured correctly. If you temporarily cannot access correctly reissued certificates, you can choose to opt in or out of the security change to avoid any connectivity effects. To do this, specify the following appsetting in the configuration file:

    <appSettings>
        <add key="wcf:useLegacyCertificateUsagePolicy" value="true" />
    </appSettings>

    Note Setting the value to “true” will opt out of the security changes.

  • For more information about this security update as it relates to Windows Server 2012, see the following article in the Microsoft Knowledge Base:

4055270 Security Only update for .NET Framework 3.5 SP2, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, and 4.7.1 updates for Windows Server 2012 (KB 4055270)

↑ Back to the top


How to obtain and install the update

Method 1: Microsoft Update Catalog

To get the stand-alone package for this update, go to the Microsoft Update Catalog.

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 will open a browser window in which you may be prompted to install an ActiveX control. Install the ActiveX control to continue.
  5. Once the control is installed, you will see the Microsoft Update Catalog screen. Enter 4055270 in 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. When you have selected all the packages you need, select View Basket.
  8. Select Import to import the packages to your WSUS server.
  9. Select Close once the packages have been imported to return to WSUS.

The updates are now available for installation through WSUS.

↑ Back to the top


Update deployment information

For deployment details for this security update, go to the following article in the Microsoft Knowledge Base:

20180109 Security update deployment information: January 9, 2018

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 update KB 3122658.

↑ Back to the top


File information

File hash
Package name PackageHashSHA1 PackageHashSHA2
Windows8-RT-KB4054181-x86.msu E7EB40BF8924591E14EC5E312763900AED192B85 BDC9A78800900F4E15F78AF7A87739061B2F009187237F28D7AFACB62DF8E6E8
Windows8-RT-KB4054181-x64.msu 0D519D58C7829EB027165778038C6C49050A1D80 75EC3BDE674B5C6A8E340222938CEFEF0442E9C02C8790CF88ED06D6417CC9B3

 

 

↑ Back to the top


How to obtain help and support for this security update

↑ Back to the top


Applies to

This article applies to the following:

 

  • Microsoft .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, and 4.7.1 when used with:
    • Windows Server 2012
 

↑ Back to the top


Keywords: kbsurveynew, kbsecvulnerability, kbsecurity, kbsecreview, kbsecbulletin, kblangall, kbfix, kbexpertiseinter, kbbug, atdownload, kb, kbmustloc

↑ Back to the top

Article Info
Article ID : 4054181
Revision : 19
Created on : 1/20/2018
Published on : 1/20/2018
Exists online : False
Views : 307