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Ubuntu 23.10: USN-6438-2 Critical: .NET Denial Of Service Fix

ubuntu
Calendar Grey October 25, 2023
Dist Ubuntu Esm H88
A flaw in .Net's functionality was rectified through Ubuntu Security Notice USN-6438-2, mitigating potential denial of service vulnerabilities.
An incomplete fix was discovered in .Net.

Summary

An incomplete fix was discovered in .Net.

Software Description:

- dotnet6: dotNET CLI tools and runtime

- dotnet7: dotNET CLI tools and runtime

Details:

USN-6438-1 fixed vulnerabilities in .Net. It was discovered that the fix

for [CVE-2023-36799](https://ubuntu.com/security/CVE-2023-36799) was incomplete. This update fixes the problem.

Original advisory details:

Kevin Jones discovered that .NET did not properly process certain

X.509 certificates. An attacker could possibly use this issue to

cause a denial of service. (CVE-2023-36799)

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. (CVE-2023-44487)

Topics%20covered

Topics Covered

security advisory critical risk DoS Ubuntu incomplete fix dotNet

Update Instructions

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

Ubuntu 23.10:
  aspnetcore-runtime-6.0          6.0.124-0ubuntu1~23.10.1
  aspnetcore-runtime-7.0          7.0.113-0ubuntu1~23.10.1
  dotnet-host                     6.0.124-0ubuntu1~23.10.1
  dotnet-host-7.0                 7.0.113-0ubuntu1~23.10.1
  dotnet-hostfxr-6.0              6.0.124-0ubuntu1~23.10.1
  dotnet-hostfxr-7.0              7.0.113-0ubuntu1~23.10.1
  dotnet-runtime-6.0              6.0.124-0ubuntu1~23.10.1
  dotnet-runtime-7.0              7.0.113-0ubuntu1~23.10.1
  dotnet-sdk-6.0                  6.0.124-0ubuntu1~23.10.1
  dotnet-sdk-7.0                  7.0.113-0ubuntu1~23.10.1
  dotnet6                         6.0.124-0ubuntu1~23.10.1
  dotnet7                         7.0.113-0ubuntu1~23.10.1

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

References

https://ubuntu.com/security/notices/USN-6438-2

https://ubuntu.com/security/notices/USN-6438-1

CVE-2023-36799, https://bugs.launchpad.net/ubuntu/+source/dotnet6/+bug/2040207, https://bugs.launchpad.net/ubuntu/+source/dotnet7/+bug/2040208

Severity
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Ubuntu Security Notice USN-6438-2

Topics%20covered

Topics Covered

security advisory critical risk DoS Ubuntu incomplete fix dotNet

Package Information

https://launchpad.net/ubuntu/+source/dotnet6/6.0.124-0ubuntu1~23.10.1
https://launchpad.net/ubuntu/+source/dotnet7/7.0.113-0ubuntu1~23.10.1

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