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

Synopsis:          Important: dotnet security and bugfix update
Advisory ID:       RHSA-2021:0474-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:0474
Issue date:        2021-02-10
CVE Names:         CVE-2021-1721
====================================================================
1. Summary:

An update for .NET Core 2.1 is now available for Red Hat Enterprise Linux
8.

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:

Red Hat Enterprise Linux AppStream (v. 8) - x86_64

3. Description:

.NET Core 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 Core that address a security vulnerability are now
available. The updated versions are .NET Core SDK 2.1.521 and .NET Core
Runtime 2.1.25.

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:

Red Hat Enterprise Linux AppStream (v. 8):

Source:
dotnet-2.1.521-1.el8_3.src.rpm

x86_64:
dotnet-debuginfo-2.1.521-1.el8_3.x86_64.rpm
dotnet-debugsource-2.1.521-1.el8_3.x86_64.rpm
dotnet-host-fxr-2.1-2.1.25-1.el8_3.x86_64.rpm
dotnet-host-fxr-2.1-debuginfo-2.1.25-1.el8_3.x86_64.rpm
dotnet-runtime-2.1-2.1.25-1.el8_3.x86_64.rpm
dotnet-runtime-2.1-debuginfo-2.1.25-1.el8_3.x86_64.rpm
dotnet-sdk-2.1-2.1.521-1.el8_3.x86_64.rpm
dotnet-sdk-2.1.5xx-2.1.521-1.el8_3.x86_64.rpm
dotnet-sdk-2.1.5xx-debuginfo-2.1.521-1.el8_3.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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