.NET Framework May 2019 Security and Quality Rollup

Today, we are releasing the May 2019 Cumulative Update, Security and Quality Rollup, and Security Only Update.

Security

CVE-2019-0820 – Denial of Service Vulnerability

A denial of service vulnerability exists when .NET Framework and .NET Core improperly process RegEx strings. An attacker who successfully exploited this vulnerability could cause a denial of service against a .NET application. A remote unauthenticated attacker could exploit this vulnerability by issuing specially crafted requests to a .NET Framework (or .NET core) application. The update addresses the vulnerability by correcting how .NET Framework and .NET Core applications handle RegEx string processing.

CVE-2019-0820

CVE-2019-0980 – Denial of Service Vulnerability

A denial of service vulnerability exists when .NET Framework or .NET Core improperly handle web requests. An attacker who successfully exploited this vulnerability could cause a denial of service against a .NET Framework or .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 Framework or .NET Core application. The update addresses the vulnerability by correcting how .NET Framework or .NET Core web applications handles web requests.

CVE-2019-0980

CVE-2019-0981 – Denial of Service Vulnerability

A denial of service vulnerability exists when .NET Framework or .NET Core improperly handle web requests. An attacker who successfully exploited this vulnerability could cause a denial of service against a .NET Framework or .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 Framework or .NET Core application. The update addresses the vulnerability by correcting how .NET Framework or .NET Core web applications handles web requests.

CVE-2019-0981

CVE-2019-0864 – Denial of Service Vulnerability

A denial of service vulnerability exists when .NET Framework improperly handles objects in heap memory. An attacker who successfully exploited this vulnerability could cause a denial of service against a .NET application. To exploit this vulnerability, an attacker would have to log on to an affected system and run a specially crafted application. The security update addresses the vulnerability by correcting how .NET Framework handle objects in heap memory.

CVE-2019-0864

Getting the Update

The Cumulative Update and Security and Quality Rollup are available via Windows Update, Windows Server Update Services, Microsoft Update Catalog, and Docker.  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.

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

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

Docker Images

We are updating the following .NET Framework Docker images for today’s release:

• microsoft/aspnet
• microsoft/dotnet-framework
• microsoft/dotnet-framework-samples

Note: Look at the “Tags” view in each repository to see the updated Docker image tags.

Note: Significant changes have been made with Docker images recently. Please look at .NET Docker Announcements for more information.

Previous Monthly Rollups

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

• March 2019 Cumulative Update for Windows 10 version 1809 and Windows Server 2019
• March 2019 Update
• February 2019 Cumulative Update for Windows 10 version 1809 and Windows Server 2019
• February 2019 Preview of Quality Rollup
• February 2019 Security and Quality Rollup

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