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

Synopsis:          Moderate: thunderbird security update
Advisory ID:       RHSA-2021:1192-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:1192
Issue date:        2021-04-14
CVE Names:         CVE-2021-23991 CVE-2021-23992 CVE-2021-23993 
=====================================================================

1. Summary:

An update for thunderbird 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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - ppc64le, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64

3. Description:

Mozilla Thunderbird is a standalone mail and newsgroup client.

This update upgrades Thunderbird to version 78.9.1.

Security Fix(es):

* Mozilla: An attacker may use Thunderbird's OpenPGP key refresh mechanism
to poison an existing key (CVE-2021-23991)

* Mozilla: A crafted OpenPGP key with an invalid user ID could be used to
confuse the user (CVE-2021-23992)

* Mozilla: Inability to send encrypted OpenPGP email after importing a
crafted OpenPGP key (CVE-2021-23993)

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

All running instances of Thunderbird must be restarted for the update to
take effect.

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

1948393 - CVE-2021-23991 Mozilla: An attacker may use Thunderbird's OpenPGP key refresh mechanism to poison an existing key
1948394 - CVE-2021-23992 Mozilla: A crafted OpenPGP key with an invalid user ID could be used to confuse the user
1948395 - CVE-2021-23993 Mozilla: Inability to send encrypted OpenPGP email after importing a crafted OpenPGP key

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
thunderbird-78.9.1-1.el7_9.src.rpm

x86_64:
thunderbird-78.9.1-1.el7_9.x86_64.rpm
thunderbird-debuginfo-78.9.1-1.el7_9.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

Source:
thunderbird-78.9.1-1.el7_9.src.rpm

ppc64le:
thunderbird-78.9.1-1.el7_9.ppc64le.rpm
thunderbird-debuginfo-78.9.1-1.el7_9.ppc64le.rpm

x86_64:
thunderbird-78.9.1-1.el7_9.x86_64.rpm
thunderbird-debuginfo-78.9.1-1.el7_9.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
thunderbird-78.9.1-1.el7_9.src.rpm

x86_64:
thunderbird-78.9.1-1.el7_9.x86_64.rpm
thunderbird-debuginfo-78.9.1-1.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-2021-23991
https://access.redhat.com/security/cve/CVE-2021-23992
https://access.redhat.com/security/cve/CVE-2021-23993
https://access.redhat.com/security/updates/classification/#moderate

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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