RHSA-2023:6249 - Security Advisory

Topic

An update for .NET 6.0 is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The CVE-2023-36799 was previously fixed in .NET 6.0 packages in Red Hat Enterprise Linux 7 via erratum RHSA-2023:5142, which updated .NET to SDK 6.0.122 and Runtime 6.0.22. However, the fix was not included in the upstream SDK 6.0.123 and Runtime 6.0.23, which was added to Red Hat Enterprise Linux 7 via erratum RHSA-2023:5705, introducing a security regression. This erratum re-adds the fix for CVE-2023-36799 to .NET 6.0 packages.

For more details about the regression, refer to the upstream release notes linked to the References section.

Description

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 6.0.124 and .NET Runtime 6.0.24.

Security Fix(es):

• dotnet: Denial of Service with Client Certificates using .NET Kestrel (CVE-2023-36799)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• dotNET on RHEL (for RHEL Server) 1 x86_64
• dotNET on RHEL (for RHEL Workstation) 1 x86_64
• dotNET on RHEL (for RHEL Compute Node) 1 x86_64

Fixes

• BZ - 2237317 - CVE-2023-36799 dotnet: Denial of Service with Client Certificates using .NET Kestrel

CVEs

• CVE-2023-36799

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://support.microsoft.com/en-gb/topic/-net-6-0-update-october-24-2023-kb5032874-c7206ee0-8768-496c-a122-eac43b8b85c9
• https://access.redhat.com/errata/RHSA-2023:5142