.NET Core September 2020 Updates – 2.1.22 and 3.1.8

Today, we are releasing the .NET Core September 2020 Update. These updates contain security and reliability fixes. See the individual release notes for details on updated packages.

Security

CVE-2020-1045: ASP.NET Core Security Feature Bypass Vulnerability

Microsoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

A security feature bypass vulnerability exists in the way Microsoft ASP.NET Core parses encoded cookie names.

The ASP.NET Core cookie parser decodes entire cookie strings which could allow a malicious attacker to set a second cookie with the name being percent encoded.

The security update addresses the vulnerability by fixing the way the ASP.NET Core cookie parser handles encoded names.

Getting the Update

.NET Core 3.1.8 and .NET Core SDK ( Download | Release Notes )
.NET Core 2.1.22 and .NET Core SDK ( Download | Release Notes )

See the .NET Core release notes for details on the release, including issues fixed and affected packages.

The latest .NET Core updates are available on the .NET Core download page.

Docker Images

.NET Docker images have been updated for today’s release. The following repos have been updated.

dotnet/core/sdk: .NET Core SDK
dotnet/core/aspnet: ASP.NET Core Runtime
dotnet/core/runtime: .NET Core Runtime
dotnet/core/runtime-deps: .NET Core Runtime Dependencies
dotnet/core/samples: .NET Core Samples

Note: You must pull updated .NET Core container images to get this update, with either docker pull or docker build --pull.

Visual Studio

This update will be included in a future update of Visual Studio.

Each version of Visual studio is only supported with a given version of the .NET Core SDK. Visual Studio version information is included in the .NET Core SDK download pages and release notes.If you are not using Visual Studio, we recommend using the latest SDK release.

3 comments

Christopher Mire September 10, 2020

I still don’t see 3.1.7 runtime listed under https://{name}.scm.azurewebsites.net/api/diagnostics/runtime, which was supposed to roll out in August. How long do these rollouts take?

Mike M September 22, 2020 0

indeed…

What is the ETA for .NET Core 3.1.8 runtime for Azure Apps?
- Rahul Bhandari (MSFT) Author September 25, 2020 0
  
  The 3.1.8 update is available on Azure Apps.