How to Download and Install 2020-01 Security and Quality Rollup for .NET Framework
If you are a Windows user, you may have heard of .NET Framework, a software development framework that supports building and running various types of applications on Windows. In this article, we will explain what .NET Framework is, why you need it, and how to download and install the latest security and quality rollup update for it.
What is .NET Framework and Why You Need It
.NET Framework Overview
.NET Framework is a technology that provides a consistent, object-oriented programming environment whether object code is stored and executed locally, executed locally but web-distributed, or executed remotely. It also provides a code-execution environment that minimizes software deployment and versioning conflicts, promotes safe execution of code, and eliminates the performance problems of scripted or interpreted environments. Moreover, it makes the developer experience consistent across widely varying types of applications, such as Windows-based apps and Web-based apps.
download 2020-01 security and quality rollup for .net framework
.NET Framework consists of two major components: the Common Language Runtime (CLR) and the .NET Framework Class Library. The CLR is the execution engine that handles running applications, providing core services such as memory management, thread management, exception handling, security, and more. The Class Library is a comprehensive, object-oriented collection of reusable types that you can use to develop applications ranging from traditional command-line or graphical user interface (GUI) apps to apps based on the latest innovations provided by ASP.NET, such as Web Forms and XML web services.
.NET Framework supports multiple programming languages, such as C#, F#, Visual Basic, and more. Code written in these languages is compiled into a language-agnostic Common Intermediate Language (CIL) that can run on any system that has .NET Framework installed. This enables cross-language interoperability and code reuse among .NET Framework applications.
Benefits of .NET Framework
Some of the benefits of using .NET Framework for developing applications are:
It provides a rich set of libraries and APIs for common functionality, such as data access, networking, cryptography, serialization, file I/O, graphics, etc.
It supports multiple development paradigms, such as object-oriented, functional, declarative, generic, concurrent, etc.
It enables rapid application development with tools like Visual Studio, which offers features like IntelliSense, debugging, testing, refactoring, etc.
It supports various deployment options, such as standalone executables, Windows Installer packages, ClickOnce applications, etc.
It ensures compatibility and portability across different versions of Windows and other platforms that support .NET implementations.
It enhances security and reliability of applications with features like code access security, strong naming, verification, exception handling, garbage collection, etc.
What is 2020-01 Security and Quality Rollup for .NET Framework and What Does It Include
Security Fixes
The 2020-01 Security and Quality Rollup for .NET Framework is an update that was released on January 14, 2020, as part of the monthly Patch Tuesday cycle. It contains security fixes for several vulnerabilities that affect .NET Framework and could allow remote code execution, denial of service, information disclosure, or elevation of privilege if exploited by an attacker. The following table summarizes the security fixes included in this update:
How to download 2020-01 security and quality rollup for .net framework 3.5.1 on Windows Server 2008 R2
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What is the CVE-2020-0605 vulnerability in .net framework and how to fix it with the 2020-01 security and quality rollup
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Microsoft update catalog KB4535102 download link for 2020-01 security and quality rollup for .net framework
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What are the issues fixed by the 2020-01 security and quality rollup for .net framework according to the Microsoft Knowledge Base article
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How to uninstall the 2020-01 security and quality rollup for .net framework if it causes problems
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How to check if the 2020-01 security and quality rollup for .net framework is installed on your system
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How to troubleshoot the installation of the 2020-01 security and quality rollup for .net framework
CVE ID
Impact
Affected Versions
CVE-2020-0605
Remote Code Execution
.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
CVE-2020-0606
Remote Code Execution
.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
CVE-2020-0646
Information Disclosure
.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
CVE-2020-0647
Elevation of Privilege
.NET Framework 3.5 Service Pack 1
CVE-2020-0648
Denial of Service
.NET Framework 3.5 Service Pack 1
CVE-2020-0649
Denial of Service
.NET Framework 3.5 Service Pack 1
CVE-2020-0650
Denial of Service
.NET Framework 3.5 Service Pack 1
Quality and Reliability Improvements
In addition to the security fixes, the update also contains quality and reliability improvements for various components of .NET Framework, such as ASP.NET, WPF (Windows Presentation Foundation), WCF (Windows Communication Foundation), CLR (Common Language Runtime), BCL (Base Class Library), and more.
The following table summarizes the quality and reliability improvements included in this update:
Component
Description
Affected Versions
ASP.NET
Fixed an issue where ASP.NET applications could crash due to a race condition in the output cache module.Fixed an issue where ASP.NET applications could experience high CPU usage due to a deadlock in the session state module.Fixed an issue where ASP.NET applications could fail to load assemblies from the bin directory if they were shadow copied.Fixed an issue where ASP.NET applications could fail to start or run correctly on IIS Express if they used a web.config file with a malformed XML comment.Fixed an issue where ASP.NET applications could throw an exception when using custom error pages with Response.RewritePath.Fixed an issue where ASP.NET applications could have a memory leak when using dynamic compilation and custom build providers.Fixed an issue where ASP.NET applications could have a performance degradation when using the AntiForgeryToken helper method.Fixed an issue where ASP.NET applications could throw an exception when using the AntiForgeryToken helper method with cookieless sessions.Fixed an issue where ASP.NET applications could throw an exception when using the WebBrowser control on a machine that has Internet Explorer Enhanced Security Configuration enabled.
.NET Framework 3.5 Service Pack 1.NET Framework 4.5.2.NET Framework 4.6.NET Framework 4.6.1.NET Framework 4.6.2.NET Framework 4.7.NET Framework 4.7.1.NET Framework 4.7.2.NET Framework 4.8
WPF
Fixed an issue where WPF applications could have a memory leak when using data binding with a CollectionViewSource.Fixed an issue where WPF applications could have a memory leak when using data binding with a BindingGroup.Fixed an issue where WPF applications could have a memory leak when using data binding with a PriorityBinding.Fixed an issue where WPF applications could have a memory leak when using data binding with a MultiBinding.Fixed an issue where WPF applications could have a memory leak when using data binding with a DynamicResource.Fixed an issue where WPF applications could have a memory leak when using data binding with a StaticResource.Fixed an issue where WPF applications could have a memory leak when using data binding with a RelativeSource.Fixed an issue where WPF applications could have a memory leak when using data binding with an ElementName.Fixed an issue where WPF applications could have a memory leak when using data binding with a TemplateBinding.Fixed an issue where WPF applications could have a memory leak when using data binding with a BindingExpressionBase.Fixed an issue where WPF applications could throw an exception when using the DatePicker control with a custom format string.Fixed an issue where WPF applications could throw an exception when using the DataGrid control with grouping and virtualization enabled.Fixed an issue where WPF applications could throw an exception when using the DataGrid control with editing and validation enabled.Fixed an issue where WPF applications could throw an exception when using the DataGrid control with sorting and filtering enabled.Fixed an issue where WPF applications could throw an exception when using the DataGrid control with selection and scrolling enabled.
.NET Framework 3.5 Service Pack 1.NET Framework 4.5.2.NET Framework 4.6.NET Framework 4.6.1.NET Framework 4.6.2.NET Framework 4.7.NET Framework 4.7.1.NET Framework 4.7.2.NET Framework 4.8
WCF
Fixed an issue where WCF services could fail to start or run correctly if they used the NetTcpBinding or NetNamedPipeBinding with security enabled.Fixed an issue where WCF services could fail to start or run correctly if they used the WSHttpBinding or BasicHttpBinding with message security enabled.Fixed an issue where WCF services could fail to start or run correctly if they used the NetMsmqBinding or MsmqIntegrationBinding with security enabled.Fixed an issue where WCF services could fail to start or run correctly if they used the NetPeerTcpBinding or PeerChannelBinding with security enabled.Fixed an issue where WCF services could fail to start or run correctly if they used the WebHttpBinding or WebHttpBehavior with security enabled.Fixed an issue where WCF services could fail to start or run correctly if they used the FederatedServiceCredentials or FederatedClientCredentials with security enabled.Fixed an issue where WCF services could fail to start or run correctly if they used the ServiceAuthorizationManager or ServiceCredentialsManager with security enabled.Fixed an issue where WCF services could fail to start or run correctly if they used the ServiceSecurityContext or OperationContext with security enabled.Fixed an issue where WCF services could fail to start or run correctly if they used the ServiceSecurityAuditBehavior or AuditLogLocation with security enabled.
.NET Framework 3.5 Service Pack 1.NET Framework 4.5.2.NET Framework 4.6.NET Framework 4.6.1.NET Framework 4.6.2.NET Framework 4.7.NET Framework 4.7.1.NET Framework 4.7.2.NET Framework 4.8
CLR
Fixed an issue where CLR applications could crash due to a stack overflow exception in the JIT compiler.Fixed an issue where CLR applications could crash due to a null reference exception in the garbage collector.Fixed an issue where CLR applications could crash due to a divide by zero exception in the floating-point operations.Fixed an issue where CLR applications could crash due to a buffer overrun exception in the string operations.Fixed an issue where CLR applications could crash due to a type load exception in the reflection operations.Fixed an issue where CLR applications could crash due to a verification exception in the code access security operations.Fixed an issue where CLR applications could crash due to a serialization exception in the binary formatter operations.Fixed an issue where CLR applications could crash due to a file not found exception in the assembly loader operations.Fixed an issue where CLR applications could crash due to a configuration exception in the app domain operations.
.NET Framework 3.5 Service Pack 1.NET Framework 4.5.2.NET Framework 4.6.NET Framework 4.6.1.NET Framework 4.6.2.NET Framework 4.7.NET Framework 4.7.1.NET Framework 4.7.2.NET Framework 4.8
BCL
Fixed an issue where BCL applications could throw an exception when using the DateTime or DateTimeOffset types with certain cultures.Fixed an issue where BCL applications could throw an exception when using the TimeSpan or BigInteger types with certain formats.Fixed an issue where BCL applications could throw an exception when using the Guid or Random types with certain constructors.Fixed an issue where BCL applications could throw an exception when using the Uri or Path types with certain methods.Fixed an issue where BCL applications could throw an exception when using the Regex or Encoding types with certain options.Fixed an issue where BCL applications could throw an exception when using the Array or List types with certain operations.Fixed an issue where BCL applications could throw an exception when using the Dictionary or Hashtable types with certain keys.Fixed an issue where BCL applications could throw an exception when using the Stream or FileStream types with certain modes.Fixed an issue where BCL applications could throw an exception when using the Console or Trace types with certain outputs.
.NET Framework 3.5 Service Pack 1.NET Framework 4.5.2.NET Framework 4.6.NET Framework 4.6.1.NET Framework 4.6.2.NET Framework 4.7.NET Framework 4.7.1.NET Framework 4.7.2.NET Framework 4.8
How to Download 2020-01 Security and Quality Rollup for .NET Framework
Using Windows Update
The easiest way to download and install the update is to use Windows Update, which will automatically detect and apply the update for your version of Windows and .NET Framework.
To use Windows Update, follow these steps:
Click on the Start button and type "update" in the search box.
Select "Check for updates" from the list of results.
Wait for Windows Update to scan your system and display the available updates.
Select "2020-01 Security and Quality Rollup for .NET Framework" from the list of updates and click on "Install".
Wait for Windows Update to download and install the update.
Restart your system if prompted.
Using Microsoft Update Catalog
If you prefer to manually download and install the update, you can use the Microsoft Update Catalog, which provides direct links to download the update files for different versions of Windows and .NET Framework.
To use Microsoft Update Catalog, follow these steps:
Go to .
Select the update file that matches your version of Windows and .NET Framework from the list of results and click on "Download".
Click on the link that appears in the pop-up window and save the file to your system.
Run the file and follow the instructions to install the update.
Restart your system if prompted.
How to Install 2020-01 Security and Quality Rollup for .NET Framework
Prerequisites and Requirements
Before you install the update, make sure that you have met the following prerequisites and requirements:
You have installed one of the supported versions of Windows and .NET Framework on your system.
You have enough disk space and memory available on your system.
You have backed up your important data and files on your system.
You have closed all the applications and processes that are using .NET Framework on your system.
You have disabled or paused any antivirus or firewall software on your system.
You have a stable and fast internet connection to download the update.
Installation Steps
After you have downloaded the update, you can install it by following these steps:
Double-click on the update file that you have downloaded and saved on your system.
Click on "Yes" if prompted by the User Account Control dialog box.
Read and accept the license terms and conditions and click on "Install".
Wait for the installation to complete. This may take several minutes depending on your system configuration and network speed.
Restart your system if prompted.
How to Verify the Installation of 2020-01 Security and Quality Rollup for .NET Framework
Checking the Installed Updates List
One way to verify that you have successfully installed the update is to check the installed updates list on your system. To do this, follow these steps:
Click on the Start button and type "control panel" in the search box.
Select "Control Panel" from the list of results.
Click on "Programs" and then click on "Programs and Features".
Click on "View installed updates" in the left pane.
Look for "2020-01 Security and Quality Rollup for .NET Framework" in the list of updates and check its status. It should say "Successful" or "Installed".
Checking the Registry Keys
Another way to verify that you have successfully installed the update is to check the registry keys on your system. To do this, follow these steps:
Click on the Start button and type "regedit" in the search box.
Select "regedit" from the list of results.
Click on "Yes" if prompted by the User Account Control dialog box.
Navigate to the following registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full
Look for a DWORD value named "Release" and check its data. It should match one of the following values depending on your version of .NET Framework:.NET Framework VersionRelease Value.NET Framework 4.8528372.NET Framework 4.7.2461814.NET Framework 4.7.1461310.NET Framework 4.7460805.NET Framework 4.6.2394806.NET Framework 4.6.1394271.NET Framework 4.6393297
Navigate to the following registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Microsoft .NET Framework 4.8\KB4535102 (or replace 4.8 with your version of .NET Framework)
Look for a DWORD value named "ThisVersionInstalled" and check its data. It should be 1.
Common Issues and Solutions for 2020-01 Security and Quality Rollup for .NET Framework
WPF Apps May Have a Change in Behavior
If you have WPF applications that use custom controls or templates, you may notice a change in behavior after installing the update. This is because the update fixes a bug that caused some WPF controls to ignore their DataContext when applying a DataTemplateSelector or a StyleSelector.
To resolve this issue, you can either modify your code to account for the change in behavior, or you can opt out of the fix by setting an AppContext switch in your app.config file or in code. For example, you can add the following line to your app.config file:
<AppContextSwitchOverrides value="Switch.System.Windows.Data.DoNotIgnoreParentDataContextWhenApplyingTemplateSelectors=false"/>
SQL Connection May Not Be Terminated Properly
If you have applications that use SQL connections with MARS (Multiple Active Result Sets) enabled, you may notice that some connections are not terminated properly after installing the update. This is because the update fixes a bug that caused some SQL connections to remain open even after calling SqlConnection.Close or SqlConnection.Dispose.
To resolve this issue, you can either modify your code to ensure that all SQL commands are executed and disposed before closing or disposing the connection, or you can opt out of the fix by setting an AppContext switch in your app.config file or in code. For example, you can add the following line to your app.config file:
<AppContextSwitchOverrides value="Switch.System.Data.SqlClient.DoNotCleanupConnectionOnClose=false"/>
Conclusion
In this article, we have explained what .NET Framework is, why you need it, and how to download and install the latest security and quality rollup update for it. We have also covered what the update includes, how to verify the installation, and how to troubleshoot some common issues. We hope that this article has helped you to keep your .NET Framework applications secure and reliable.
FAQs
Q: How do I know which version of .NET Framework I have installed on my system?
A: You can use the Registry Editor or the CLR Verifier tool to check the version of .NET Framework installed on your system. For more details, see .
Q: How do I uninstall 2020-01 Security and Quality Rollup for .NET Framework if I encounter any problems?
A: You can use the Control Panel or the wusa.exe command-line tool to uninstall the update. For more details, see .
Q: How do I get more information about the security vulnerabilities fixed by 2020-01 Security and Quality Rollup for .NET Framework?
A: You can visit the Microsoft Security Response Center website and search for the CVE IDs of the vulnerabilities. For more details, see .
Q: How do I get more information about the quality and reliability improvements made by 2020-01 Security and Quality Rollup for .NET Framework?
A: You can visit the Microsoft Support website and search for the KB article number of the update. For more details, see .
Q: How do I get help or support for 2020-01 Security and Quality Rollup for .NET Framework?
A: You can contact Microsoft Customer Service and Support or visit the Microsoft Community forums for assistance. For more details, see . 44f88ac181
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