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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: .NET 5.0 on Red Hat Enterprise Linux security and
 bugfix update
Advisory ID:       RHSA-2021:0473-01
Product:           .NET Core on Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:0473
Issue date:        2021-02-10
CVE Names:         CVE-2021-1721 
=====================================================================

1. Summary:

An update for rh-dotnet50-dotnet is now available for .NET on Red Hat
Enterprise Linux.

Red Hat Product Security has rated this update as having a security impact
of Important. 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.

2. Relevant releases/architectures:

.NET Core on Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64
.NET Core on Red Hat Enterprise Linux Server (v. 7) - x86_64
.NET Core on Red Hat Enterprise Linux Workstation (v. 7) - x86_64

3. 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 5.0.103 and .NET Runtime
5.0.3.

Security Fix(es):

* dotnet: certificate chain building recursion Denial of Service
(CVE-2021-1721)

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.

4. 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

5. Bugs fixed (https://bugzilla.redhat.com/):

1926918 - CVE-2021-1721 dotnet: certificate chain building recursion Denial of
 Service

6. Package List:

.NET Core on Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
rh-dotnet50-dotnet-5.0.103-1.el7_9.src.rpm

x86_64:
rh-dotnet50-aspnetcore-runtime-5.0-5.0.3-1.el7_9.x86_64.rpm
rh-dotnet50-aspnetcore-targeting-pack-5.0-5.0.3-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-5.0.103-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-apphost-pack-5.0-5.0.3-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-debuginfo-5.0.103-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-host-5.0.3-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-hostfxr-5.0-5.0.3-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-runtime-5.0-5.0.3-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-sdk-5.0-5.0.103-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-targeting-pack-5.0-5.0.3-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-templates-5.0-5.0.103-1.el7_9.x86_64.rpm
rh-dotnet50-netstandard-targeting-pack-2.1-5.0.103-1.el7_9.x86_64.rpm

.NET Core on Red Hat Enterprise Linux Server (v. 7):

Source:
rh-dotnet50-dotnet-5.0.103-1.el7_9.src.rpm

x86_64:
rh-dotnet50-aspnetcore-runtime-5.0-5.0.3-1.el7_9.x86_64.rpm
rh-dotnet50-aspnetcore-targeting-pack-5.0-5.0.3-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-5.0.103-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-apphost-pack-5.0-5.0.3-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-debuginfo-5.0.103-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-host-5.0.3-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-hostfxr-5.0-5.0.3-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-runtime-5.0-5.0.3-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-sdk-5.0-5.0.103-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-targeting-pack-5.0-5.0.3-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-templates-5.0-5.0.103-1.el7_9.x86_64.rpm
rh-dotnet50-netstandard-targeting-pack-2.1-5.0.103-1.el7_9.x86_64.rpm

.NET Core on Red Hat Enterprise Linux Workstation (v. 7):

Source:
rh-dotnet50-dotnet-5.0.103-1.el7_9.src.rpm

x86_64:
rh-dotnet50-aspnetcore-runtime-5.0-5.0.3-1.el7_9.x86_64.rpm
rh-dotnet50-aspnetcore-targeting-pack-5.0-5.0.3-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-5.0.103-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-apphost-pack-5.0-5.0.3-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-debuginfo-5.0.103-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-host-5.0.3-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-hostfxr-5.0-5.0.3-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-runtime-5.0-5.0.3-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-sdk-5.0-5.0.103-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-targeting-pack-5.0-5.0.3-1.el7_9.x86_64.rpm
rh-dotnet50-dotnet-templates-5.0-5.0.103-1.el7_9.x86_64.rpm
rh-dotnet50-netstandard-targeting-pack-2.1-5.0.103-1.el7_9.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2021-1721
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2021 Red Hat, Inc.
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