Ubuntu 23.04 & 22.04 LTS USN-6427-1 Critical: .NET Denial Of Service

ubuntu

October 10, 2023

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

Summary

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

traffic.

Software Description:

- dotnet6: dotNET CLI tools and runtime

- dotnet7: dotNET CLI tools and runtime

Details:

It was discovered that the .NET Kestrel web server did not properly handle

HTTP/2 requests. A remote attacker could possibly use this issue to cause a

denial of service.

Topics Covered

security advisory denial of service critical threat network traffic ubuntu dotnet

Update Instructions

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

Ubuntu 23.04:
   aspnetcore-runtime-6.0           6.0.123-0ubuntu1~23.04.1
   aspnetcore-runtime-7.0           7.0.112-0ubuntu1~23.04.1
   dotnet-host 6.0.123-0ubuntu1~23.04.1
   dotnet-host-7.0                        7.0.112-0ubuntu1~23.04.1
   dotnet-hostfxr-6.0                    6.0.123-0ubuntu1~23.04.1
   dotnet-hostfxr-7.0                    7.0.112-0ubuntu1~23.04.1
   dotnet-runtime-6.0                   6.0.123-0ubuntu1~23.04.1
   dotnet-runtime-7.0                   7.0.112-0ubuntu1~23.04.1
   dotnet-sdk-6.0                         6.0.123-0ubuntu1~23.04.1
   dotnet-sdk-7.0                         7.0.112-0ubuntu1~23.04.1
   dotnet6 6.0.123-0ubuntu1~23.04.1
   dotnet7 7.0.112-0ubuntu1~23.04.1

Ubuntu 22.04 LTS:
   aspnetcore-runtime-6.0           6.0.123-0ubuntu1~22.04.1
   aspnetcore-runtime-7.0           7.0.112-0ubuntu1~22.04.1
   dotnet-host 6.0.123-0ubuntu1~22.04.1
   dotnet-host-7.0                        7.0.112-0ubuntu1~22.04.1
   dotnet-hostfxr-6.0                    6.0.123-0ubuntu1~22.04.1
   dotnet-hostfxr-7.0                    7.0.112-0ubuntu1~22.04.1
   dotnet-runtime-6.0                   6.0.123-0ubuntu1~22.04.1
   dotnet-runtime-7.0                   7.0.112-0ubuntu1~22.04.1
   dotnet-sdk-6.0                         6.0.123-0ubuntu1~22.04.1
   dotnet-sdk-7.0                         7.0.112-0ubuntu1~22.04.1
   dotnet6 6.0.123-0ubuntu1~22.04.1
   dotnet7 7.0.112-0ubuntu1~22.04.1

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