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

[USN-6278-2] .NET vulnerabilities

==========================================================================
Ubuntu Security Notice USN-6278-2
August 10, 2023

dotnet6, dotnet7 vulnerabilities
==========================================================================

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

- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in .NET.

Software Description:
- dotnet6: dotNET CLI tools and runtime
- dotnet7: dotNET CLI tools and runtime

Details:

USN-6278-1 fixed several vulnerabilities in .NET. This update
provides the corresponding updates for Ubuntu 22.04 LTS.

Original advisory details:

  It was discovered that .NET did properly handle the execution of
  certain commands. An attacker could possibly use this issue to
  achieve remote code execution. (CVE-2023-35390)

  Benoit Foucher discovered that .NET did not properly implement the
  QUIC stream limit in HTTP/3. An attacker could possibly use this
  issue to cause a denial of service. (CVE-2023-38178)

  It was discovered that .NET did not properly handle the disconnection
  of potentially malicious clients interfacing with a Kestrel server. An
  attacker could possibly use this issue to cause a denial of service.
  (CVE-2023-38180)

Update instructions:

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

Ubuntu 22.04 LTS:
   aspnetcore-runtime-6.0           6.0.121-0ubuntu1~22.04.1
   aspnetcore-runtime-7.0           7.0.110-0ubuntu1~22.04.1
   dotnet-host 6.0.121-0ubuntu1~22.04.1
   dotnet-host-7.0                       7.0.110-0ubuntu1~22.04.1
   dotnet-hostfxr-6.0                   6.0.121-0ubuntu1~22.04.1
   dotnet-hostfxr-7.0                   7.0.110-0ubuntu1~22.04.1
   dotnet-runtime-6.0                  6.0.121-0ubuntu1~22.04.1
   dotnet-runtime-7.0                  7.0.110-0ubuntu1~22.04.1
   dotnet-sdk-6.0                        6.0.121-0ubuntu1~22.04.1
   dotnet-sdk-7.0                        7.0.110-0ubuntu1~22.04.1
   dotnet6 6.0.121-0ubuntu1~22.04.1
   dotnet7 7.0.110-0ubuntu1~22.04.1

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

References:
   https://ubuntu.com/security/notices/USN-6278-2
   https://ubuntu.com/security/notices/USN-6278-1
   CVE-2023-35390, CVE-2023-38178, CVE-2023-38180

Package Information:
https://launchpad.net/ubuntu/+source/dotnet6/6.0.121-0ubuntu1~22.04.1
https://launchpad.net/ubuntu/+source/dotnet7/7.0.110-0ubuntu1~22.04.1