A .NET 6 security update has been released for Ubuntu Linux 22.04 LTS and 22.10.

USN-5798-1: .NET 6 vulnerability

==========================================================================
Ubuntu Security Notice USN-5798-1
January 10, 2023

dotnet6 vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.10
- Ubuntu 22.04 LTS

Summary:

dotnet6 could be made to crash if it received specially crafted
network traffic.

Software Description:
- dotnet6: dotNET CLI tools and runtime

Details:

Johan Gorter discovered that .NET 6 incorrectly processed certain
invalid HTTP requests. An attacker could possibly use this issue to
cause a denial of service condition for an exposed endpoint.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 22.10:
aspnetcore-runtime-6.0 6.0.113-0ubuntu1~22.10.1
dotnet-host 6.0.113-0ubuntu1~22.10.1
dotnet-hostfxr-6.0 6.0.113-0ubuntu1~22.10.1
dotnet-runtime-6.0 6.0.113-0ubuntu1~22.10.1
dotnet-sdk-6.0 6.0.113-0ubuntu1~22.10.1
dotnet6 6.0.113-0ubuntu1~22.10.1

Ubuntu 22.04 LTS:
aspnetcore-runtime-6.0 6.0.113-0ubuntu1~22.04.1
dotnet-host 6.0.113-0ubuntu1~22.04.1
dotnet-hostfxr-6.0 6.0.113-0ubuntu1~22.04.1
dotnet-runtime-6.0 6.0.113-0ubuntu1~22.04.1
dotnet-sdk-6.0 6.0.113-0ubuntu1~22.04.1
dotnet6 6.0.113-0ubuntu1~22.04.1

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-5798-1
CVE-2023-21538

Package Information:
https://launchpad.net/ubuntu/+source/dotnet6/6.0.113-0ubuntu1~22.10.1
https://launchpad.net/ubuntu/+source/dotnet6/6.0.113-0ubuntu1~22.04.1