==========================================================================
Ubuntu Security Notice USN-7058-1
October 08, 2024

dotnet6, dotnet8 vulnerabilities
==========================================================================

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

- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in dotnet6, dotnet8.

Software Description:
- dotnet8: .NET CLI tools and runtime
- dotnet6: .NET CLI tools and runtime

Details:

Brennan Conroy discovered that the .NET Kestrel web server did not
properly handle closing HTTP/3 streams under certain circumstances. An
attacker could possibly use this issue to achieve remote code execution.
This vulnerability only impacted Ubuntu 22.04 LTS and Ubuntu 24.04 LTS.
(CVE-2024-38229)

It was discovered that .NET components designed to process malicious input
were susceptible to hash flooding attacks. An attacker could possibly use
this issue to cause a denial of service, resulting in a crash.
(CVE-2024-43483)

It was discovered that the .NET System.IO.Packaging namespace did not
properly process SortedList data structures. An attacker could possibly
use this issue to cause a denial of service, resulting in a crash.
(CVE-2024-43484)

It was discovered that .NET did not properly handle the deserialization of
of certain JSON properties. An attacker could possibly use this issue to
cause a denial of service, resulting in a crash. (CVE-2024-43485)

Update instructions:

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

Ubuntu 24.04 LTS
  aspnetcore-runtime-8.0          8.0.10-0ubuntu1~24.04.1
  dotnet-host-8.0                 8.0.10-0ubuntu1~24.04.1
  dotnet-hostfxr-8.0              8.0.10-0ubuntu1~24.04.1
  dotnet-runtime-8.0              8.0.10-0ubuntu1~24.04.1
  dotnet-sdk-8.0                  8.0.110-0ubuntu1~24.04.1
  dotnet8                         8.0.110-8.0.10-0ubuntu1~24.04.1

Ubuntu 22.04 LTS
  aspnetcore-runtime-6.0          6.0.135-0ubuntu1~22.04.1
  aspnetcore-runtime-8.0          8.0.10-0ubuntu1~22.04.1
  dotnet-host                     6.0.135-0ubuntu1~22.04.1
  dotnet-host-8.0                 8.0.10-0ubuntu1~22.04.1
  dotnet-hostfxr-6.0              6.0.135-0ubuntu1~22.04.1
  dotnet-hostfxr-8.0              8.0.10-0ubuntu1~22.04.1
  dotnet-runtime-6.0              6.0.135-0ubuntu1~22.04.1
  dotnet-runtime-8.0              8.0.10-0ubuntu1~22.04.1
  dotnet-sdk-6.0                  6.0.135-0ubuntu1~22.04.1
  dotnet-sdk-8.0                  8.0.110-0ubuntu1~22.04.1
  dotnet6                         6.0.135-0ubuntu1~22.04.1
  dotnet8                         8.0.110-8.0.10-0ubuntu1~22.04.1

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

References:
  https://ubuntu.com/security/notices/USN-7058-1
  CVE-2024-38229, CVE-2024-43483, CVE-2024-43484, CVE-2024-43485

Package Information:
https://launchpad.net/ubuntu/+source/dotnet8/8.0.110-8.0.10-0ubuntu1~24.04.1
https://launchpad.net/ubuntu/+source/dotnet6/6.0.135-0ubuntu1~22.04.1
https://launchpad.net/ubuntu/+source/dotnet8/8.0.110-8.0.10-0ubuntu1~22.04.1