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

Synopsis:          Important: dotnet3.1 security and bugfix update
Advisory ID:       RHSA-2021:0095-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:0095
Issue date:        2021-01-13
CVE Names:         CVE-2021-1723 
=====================================================================

1. Summary:

An update for .NET Core 3.1 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 3.1.111 and .NET Core
Runtime 3.1.11.

Security Fix(es):

* dotnet: ASP.NET Core Callbacks outside of locks cause Krestel deadlock
when using HTTP2 (CVE-2021-1723)

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/):

1914258 - CVE-2021-1723 dotnet: ASP.NET Core Callbacks outside of locks cause Krestel deadlock when using HTTP2

6. Package List:

Red Hat Enterprise Linux AppStream (v. 8):

Source:
dotnet3.1-3.1.111-1.el8_3.src.rpm

x86_64:
aspnetcore-runtime-3.1-3.1.11-1.el8_3.x86_64.rpm
aspnetcore-targeting-pack-3.1-3.1.11-1.el8_3.x86_64.rpm
dotnet-apphost-pack-3.1-3.1.11-1.el8_3.x86_64.rpm
dotnet-apphost-pack-3.1-debuginfo-3.1.11-1.el8_3.x86_64.rpm
dotnet-hostfxr-3.1-3.1.11-1.el8_3.x86_64.rpm
dotnet-hostfxr-3.1-debuginfo-3.1.11-1.el8_3.x86_64.rpm
dotnet-runtime-3.1-3.1.11-1.el8_3.x86_64.rpm
dotnet-runtime-3.1-debuginfo-3.1.11-1.el8_3.x86_64.rpm
dotnet-sdk-3.1-3.1.111-1.el8_3.x86_64.rpm
dotnet-sdk-3.1-debuginfo-3.1.111-1.el8_3.x86_64.rpm
dotnet-targeting-pack-3.1-3.1.11-1.el8_3.x86_64.rpm
dotnet-templates-3.1-3.1.111-1.el8_3.x86_64.rpm
dotnet3.1-debuginfo-3.1.111-1.el8_3.x86_64.rpm
dotnet3.1-debugsource-3.1.111-1.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-2021-1723
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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