July 9, 2019 — KB4507419 Cumulative Update for .NET Framework 3.5, 4.7.2, 4.8 for Windows 10, version 1809 and Windows Server 2019

Summary

A remote code execution vulnerability exists in .NET software if the software fails to check the source markup of a file. An Authentication Bypass vulnerability exists in WCF and WIF that lets SAML tokens be signed by using arbitrary symmetric keys. This vulnerability enables an attacker to impersonate another user. The vulnerability exists in WCF, WIF 3.5 and later in .NET Framework, the WIF 1.0 component in Windows, the WIF Nuget package, and the WIF implementation in SharePoint. An information disclosure vulnerability exists if Exchange and Azure Active Directory allow the creation of entities by using Display Names that have non-printable characters.

To learn more about the vulnerabilities, go to the following Common Vulnerabilities and Exposures (CVE):

• CVE-2019-1113

• CVE-2019-1006

• CVE-2019-1083

Additional information about this update

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

• 4506998 Description of the Cumulative Update for .NET Framework 3.5 and 4.7.2 for Windows 10 Version 1809 and Windows Server 2019 (KB4506998)

• 4506990 Description of the Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10 Version 1809 and Windows Server 2019 (KB4506990)

Information about protection and security

• Protect yourself online: Windows Security support

• Learn how we guard against cyber threats: Microsoft Security