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From: Ian Constantin <ian.constantin@canonical.com>
Reply-To: Ubuntu Security <security@ubuntu.com>
To: ubuntu-security-announce@lists.ubuntu.com
Message-ID: <edb482ed-f2f8-4eb6-bd9e-92470313ae29@canonical.com>
Subject: [USN-7427-1] .NET vulnerability

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==========================================================================
Ubuntu Security Notice USN-7427-1
April 08, 2025

dotnet8, dotnet9 vulnerability
==========================================================================

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

- Ubuntu 24.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

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

Software Description:
- dotnet8: .NET CLI tools and runtime
- dotnet9: .NET CLI tools and runtime

Details:

James Newton-King discovered that .NET did not properly limit resource
allocation when handling certain HTTP/3 requests. An attacker could
possibly use this issue to cause a denial of service.

Update instructions:

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

Ubuntu 24.10
   aspnetcore-runtime-8.0          8.0.15-0ubuntu1~24.10.1
   aspnetcore-runtime-9.0          9.0.4-0ubuntu1~24.10.1
   dotnet-host-8.0                 8.0.15-0ubuntu1~24.10.1
   dotnet-host-9.0                 9.0.4-0ubuntu1~24.10.1
   dotnet-hostfxr-8.0              8.0.15-0ubuntu1~24.10.1
   dotnet-hostfxr-9.0              9.0.4-0ubuntu1~24.10.1
   dotnet-runtime-8.0              8.0.15-0ubuntu1~24.10.1
   dotnet-runtime-9.0              9.0.4-0ubuntu1~24.10.1
   dotnet-sdk-8.0                  8.0.115-0ubuntu1~24.10.1
   dotnet-sdk-9.0                  9.0.105-0ubuntu1~24.10.1
   dotnet-sdk-aot-9.0              9.0.105-0ubuntu1~24.10.1
   dotnet8                         8.0.115-8.0.15-0ubuntu1~24.10.1
   dotnet9                         9.0.105-9.0.4-0ubuntu1~24.10.1

Ubuntu 24.04 LTS
   aspnetcore-runtime-8.0          8.0.15-0ubuntu1~24.04.1
   dotnet-host-8.0                 8.0.15-0ubuntu1~24.04.1
   dotnet-hostfxr-8.0              8.0.15-0ubuntu1~24.04.1
   dotnet-runtime-8.0              8.0.15-0ubuntu1~24.04.1
   dotnet-sdk-8.0                  8.0.115-0ubuntu1~24.04.1
   dotnet8                         8.0.115-8.0.15-0ubuntu1~24.04.1

Ubuntu 22.04 LTS
   aspnetcore-runtime-8.0          8.0.15-0ubuntu1~22.04.1
   dotnet-host-8.0                 8.0.15-0ubuntu1~22.04.1
   dotnet-hostfxr-8.0              8.0.15-0ubuntu1~22.04.1
   dotnet-runtime-8.0              8.0.15-0ubuntu1~22.04.1
   dotnet-sdk-8.0                  8.0.115-0ubuntu1~22.04.1
   dotnet8                         8.0.115-8.0.15-0ubuntu1~22.04.1

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

References:
   https://ubuntu.com/security/notices/USN-7427-1
   CVE-2025-26682

Package Information:
https://launchpad.net/ubuntu/+source/dotnet8/8.0.115-8.0.15-0ubuntu1~24.10.1
https://launchpad.net/ubuntu/+source/dotnet9/9.0.105-9.0.4-0ubuntu1~24.10.1
https://launchpad.net/ubuntu/+source/dotnet8/8.0.115-8.0.15-0ubuntu1~24.04.1
https://launchpad.net/ubuntu/+source/dotnet8/8.0.115-8.0.15-0ubuntu1~22.04.1

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