CVE-2020-1108: .NET Core & .NET Framework Denial of Service Vulnerability

Overview

Severity

N/A

Category

Denial of Service

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2020-May

Released

2020-05-12

Last Updated

2020-06-11

EPSS Score

3.79% (percentile: 88.1%)

Description

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

Affected Products (98)

Developer Tools

• .NET Core 3.1
• .NET Core 2.1
• Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)
• Microsoft Visual Studio 2019 version 16.0
• Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)
• Microsoft Visual Studio 2019 version 16.5
• .NET 5.0
• PowerShell Core 6.2
• PowerShell 7.0
• Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 7 for 32-bit Systems Service Pack 1
• Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 7 for x64-based Systems Service Pack 1
• Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 8.1 for 32-bit systems
• Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 8.1 for x64-based systems
• Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows RT 8.1
• Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1
• Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
• Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012
• Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 (Server Core installation)
• Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2
• Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 (Server Core installation)
• Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for 32-bit Systems
• Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for x64-based Systems
• Microsoft .NET Framework 4.8 on Windows Server, version 1803 (Server Core Installation)
• Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for 32-bit Systems
• Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for x64-based Systems
• Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems
• Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems
• Microsoft .NET Framework 4.8 on Windows Server 2016
• Microsoft .NET Framework 4.8 on Windows Server 2016 (Server Core installation)
• Microsoft .NET Framework 4.8 on Windows 7 for 32-bit Systems Service Pack 1
• Microsoft .NET Framework 4.8 on Windows 7 for x64-based Systems Service Pack 1
• Microsoft .NET Framework 4.8 on Windows 8.1 for 32-bit systems
• Microsoft .NET Framework 4.8 on Windows 8.1 for x64-based systems
• Microsoft .NET Framework 4.8 on Windows RT 8.1
• Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1
• Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
• Microsoft .NET Framework 4.8 on Windows Server 2012
• Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation)
• Microsoft .NET Framework 4.8 on Windows Server 2012 R2
• Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation)
• Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems
• Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems
• Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019
• Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 (Server Core installation)
• Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for 32-bit Systems
• Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for x64-based Systems
• Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1909 (Server Core installation)
• Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for 32-bit Systems
• Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for x64-based Systems
• Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1903 (Server Core installation)
• ... and 48 more

Security Updates (16)

• Release Notes
• 4556399
• 4556403
• 4556401
• 4556405
• 4556400
• 4556404
• 4552929
• 4552928
• 4552926
• 4556441
• 4552931
• 4556807
• 4556813
• 4556812
• 4556826

Revision History

• 2020-05-12: Information published.
• 2020-05-13: In the Security Updates table, corrected the Download links for .NET Core 2.1 and .NET Core 3.1. This is an informational change only.
• 2020-05-14: In the Security Updates table, removed Microsoft .NET Framework 3.5 installed on Windows Server 2008 for Itanium-based Systems and Microsoft .NET Framework 3.5.1 installed on Windows Server 2008 R2 for Itanium-based Systems as these versions are no longer supported.
• 2020-05-15: Revised the Security Updates table to include PowerShell Core 6.2 and 7.0 because they are affected by CVE-2020-1108. See https://github.com/PowerShell/Announcements/issues/20 for more information.
• 2020-06-09: To comprehensively address CVE-2020-1108, Microsoft has released updates for .NET Core 2.1 and .NET Core 3.1. Customers who use any of these versions of .NET Core should install the latest version of .NET Core. See the Release Notes (https://github.com/dotnet/announcements/issues/156) for the latest version numbers and instructions for updating .NET Core.
• 2020-06-11: To comprehensively address CVE-2020-1108, Microsoft has released updates for PowerShell Core 6.2 and PowerShell 7.0. Customers who use any of these versions of PowerShell should install the latest version of PowerShell. See the Release Notes (https://github.com/powershell/announcements/issues/20) for the latest version numbers and instructions for updating PowerShell.