.NET Framework republishing of July 2020 Security Only Updates

.NET Framework republishing of July 2020 Security Only Updates

Today, we are republishing the July 2020 Security Only Updates for .NET Framework to resolve a known issue that affected the original release.  You should install this version (V2) of the update as part of your normal security routine. Security CVE-2020-1147– .NET Framework Remote Code Execution Vulnerability A remote code execution vulnerability exists in .NET Framework when the software fails to check the source markup of XML file input.

Today, we are republishing the July 2020 Security Only Updates for .NET Framework to resolve a known issue that affected the original release. You should install this version (V2) of the update as part of your normal security routine.

Security

CVE-2020-1147– .NET Framework Remote Code Execution Vulnerability

A remote code execution vulnerability exists in .NET Framework when the software fails to check the source markup of XML file input. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the process responsible for deserialization of the XML content. To exploit this vulnerability, an attacker could upload a specially crafted document to a server utilizing an affected product to process content. The security update addresses the vulnerability by correcting how .NET Framework validates the source markup of XML content.

This security update affects how .NET Framework’s System.Data.DataTable and System.Data.DataSet types read XML-serialized data. Most .NET Framework applications will not experience any behavioral change after the update is installed. For more information on how the update affects .NET Framework, including examples of scenarios which may be affected, please see the DataTable and DataSet security guidance document.

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

Known Issues

This release resolves the known issue below.

Symptoms:

After you apply this update, some applications experience a TypeInitializationException exception when they try to deserialize System.Data.DataSet or System.Data.DataTable instances from the XML within a SQL CLR stored procedure. The stack trace for this exception appears as follows:

System.TypeInitializationException: The type initializer for ‘Scope’ threw an exception. —> System.IO.FileNotFoundException: Could not load file or assembly ‘System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’ or one of its dependencies. The system cannot find the file specified. at System.Data.TypeLimiter.Scope.IsTypeUnconditionallyAllowed(Type type) at System.Data.TypeLimiter.Scope.IsAllowedType(Type type) at System.Data.TypeLimiter.EnsureTypeIsAllowed(Type type, TypeLimiter capturedLimiter)

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