Headline
Ubuntu Security Notice USN-6438-2
Ubuntu Security Notice 6438-2 - USN-6438-1 fixed vulnerabilities in .Net. It was discovered that the fix for [CVE-2023-36799] was incomplete. This update fixes the problem. 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. 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.
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Ubuntu Security Notice USN-6438-2
October 25, 2023
.Net regressions
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 23.10
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 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)
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://launchpad.net/bugs/2040207, https://launchpad.net/bugs/2040208
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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# Microsoft Security Advisory CVE-2023-36799: .NET Denial of Service Vulnerability ## <a name="executive-summary"></a>Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 7.0 and .NET 6.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. A vulnerability exists in .NET where reading a maliciously crafted X.509 certificate may result in Denial of Service. This issue only affects Linux systems. ## Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/275 ### <a name="mitigation-factors"></a>Mitigation factors Microsoft has not identified any mitigating factors for this vulnerability. ## <a name="affected-software"></a>Affected software * Any .NET 7.0 application running on .NET 7.0.10 or earlier. * Any .NET 6.0 application running on .NET 6.0.21 or earlier. If your application uses the followin...
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