.NET Framework May 2020 Security and Quality Rollup Updates

Tara Overfield

Tara

On July 23, 2020, updates KB4552952 v2, KB4552951 v2, and KB4552953 v2 were released to replace v1 of those updates for .NET Framework 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, and 4.8 for Windows 7 Service Pack 1 (SP1), Windows Server 2008 R2 SP1 and Windows Server 2008 Service Pack 2 (SP2). The v1 updates did not install for customers who had certain ESU configurations. The v2 updates correct the issue for customers who could not install the v1 updates.

If you have already installed v1 of these updates, no action is necessary.

To obtain v2 of these updates, see the “How to obtain and install the update” section of the individual update article. Links to each article are found in the “Additional information about this update section” of the KB article.


Today, we are releasing the May 2020 Security and Quality Rollup Updates for .NET Framework.

Security

CVE-2020-0605 – .NET Framework Remote Code Execution Vulnerability

A remote code execution vulnerability exists in .NET software when the software fails to check the source markup of a file. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.

Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of .NET Framework. In an email attack scenario, an attacker could exploit the vulnerability by sending the specially crafted file to the user and convincing the user to open the file.

The security update addresses the vulnerability by correcting how .NET Framework checks the source markup of a file.

CVE-2020-1108 – .NET Framework Denial of Service Vulnerability

A denial of service vulnerability exists when .NET Core improperly handles web requests. An attacker who successfully exploited this vulnerability could cause a denial of service against a .NET Core 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 Core application.

The update addresses the vulnerability by correcting how the .NET Core web application handles web requests

CVE-2020-1066 – .NET Framework Elevation of Privilege Vulnerability

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.

Quality and Reliability

This release contains new quality and reliability improvements for Server 2008 SP1, Windows 7 SP1, Windows Server 2008 R2 SP1, and Windows 10 1703 (Creators Update) that were previously released for other versions of Windows in the February 2020 Preview of Quality Rollup.

Getting the Update

The Security and Quality Rollup is available via Windows Update, Windows Server Update Services, and Microsoft Update Catalog. The Security Only Update is available via Windows Server Update Services and Microsoft Update Catalog.

Microsoft Update Catalog

You can get the update via the Microsoft Update Catalog. For Windows 10, NET Framework 4.8 updates are available via Windows Update, Windows Server Update Services, Microsoft Update Catalog. Updates for other versions of .NET Framework are part of the Windows 10 Monthly Cumulative Update.

**Note**: Customers that rely on Windows Update and Windows Server Update Services will automatically receive the .NET Framework version-specific updates. Advanced system administrators can also take use of the below direct Microsoft Update Catalog download links to .NET Framework-specific updates. Before applying these updates, please ensure that you carefully review the .NET Framework version applicability, to ensure that you only install updates on systems where they apply.

The following table is for Windows 10 and Windows Server 2016+ versions.

Product VersionCumulative Update
Windows 10 2004 and Windows Server, version 2004
.NET Framework 3.5, 4.8Catalog4552925
Windows 10 1909 and Windows Server, version 1909
.NET Framework 3.5, 4.8Catalog4552931
Windows 10 1903 and Windows Server, version 1903
.NET Framework 3.5, 4.8Catalog4552931
Windows 10 1809 (October 2018 Update) and Windows Server 20194556441
.NET Framework 3.5, 4.7.2Catalog4552924
.NET Framework 3.5, 4.8Catalog4552930
Windows 10 1803 (April 2018 Update)
.NET Framework 3.5, 4.7.2Catalog4556807
.NET Framework 4.8Catalog4552929
Windows 10 1709 (Fall Creators Update)
.NET Framework 3.5, 4.7.1, 4.7.2Catalog4556812
.NET Framework 4.8Catalog4552928
Windows 10 1703 (Creators Update)
.NET Framework 3.5, 4.7, 4.7.1, 4.7.2Catalog4556804
.NET Framework 4.8Catalog4552927
Windows 10 1607 (Anniversary Update) and Windows Server 2016
.NET Framework 3.5, 4.6.2, 4.7, 4.7.1, 4.7.2Catalog4556813
.NET Framework 4.8Catalog4552926
Windows 10 1507
.NET Framework 3.5, 4.6, 4.6.1, 4.6.2Catalog4556826

The following table is for earlier Windows and Windows Server versions.

Product VersionSecurity and Quality RollupSecurity Only Update
Windows 8.1, Windows RT 8.1 and Windows Server 2012 R245564014556405
.NET Framework 3.5Catalog4552982Catalog4552966
.NET Framework 4.5.2Catalog4552946Catalog4552967
.NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2Catalog4552923Catalog4552959
.NET Framework 4.8Catalog4552933Catalog4552962
Windows Server 201245564004556404
.NET Framework 3.5Catalog4552979Catalog4552963
.NET Framework 4.5.2Catalog4552947Catalog4552968
.NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2Catalog4552922Catalog4552958
.NET Framework 4.8Catalog4552932Catalog4552961
Windows 7 SP1 and Windows Server 2008 R2 SP145563994556403
.NET Framework 3.5.1Catalog4552940Catalog4552965
.NET Framework 4.5.2Catalog4552920Catalog4552952
.NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2Catalog4552919Catalog4552951
.NET Framework 4.8Catalog4552921Catalog4552953
Windows Server 200845564024556406
.NET Framework 2.0, 3.0Catalog4552939Catalog4552964
.NET Framework 4.5.2Catalog4552920Catalog4552952
.NET Framework 4.6Catalog4552919Catalog4552951

Previous Monthly Rollups

The last few .NET Framework Monthly updates are listed below for your convenience:

* March 2020 Update for Windows 10 1607 (Anniversary Update) and Windows Server 2016 * February 2020 Preview of Quality Rollup for Windows 10 1909, Windows 10 1903, Windows Server, version 1909 and Windows Server, version 1903 * February 2020 Preview of Quality Rollup * February 2020 Security and Quality Rollup

4 comments

Comments are closed. Login to edit/delete your existing comments