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

Synopsis:          Important: thunderbird security update
Advisory ID:       RHSA-2020:5164-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2020:5164
Issue date:        2020-11-23
CVE Names:         CVE-2020-26950 
=====================================================================

1. Summary:

An update for thunderbird is now available for Red Hat Enterprise Linux 6.

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 Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

3. Description:

Mozilla Thunderbird is a standalone mail and newsgroup client.

This update upgrades Thunderbird to version 78.4.3.

Security Fix(es):

* Mozilla: Write side effects in MCallGetProperty opcode not accounted for
(CVE-2020-26950)

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/):

1896306 - CVE-2020-26950 Mozilla: Write side effects in MCallGetProperty opcode not accounted for

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
thunderbird-78.4.3-1.el6_10.src.rpm

i386:
thunderbird-78.4.3-1.el6_10.i686.rpm

x86_64:
thunderbird-78.4.3-1.el6_10.x86_64.rpm
thunderbird-debuginfo-78.4.3-1.el6_10.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

Source:
thunderbird-78.4.3-1.el6_10.src.rpm

i386:
thunderbird-78.4.3-1.el6_10.i686.rpm

ppc64:
thunderbird-78.4.3-1.el6_10.ppc64.rpm
thunderbird-debuginfo-78.4.3-1.el6_10.ppc64.rpm

s390x:
thunderbird-78.4.3-1.el6_10.s390x.rpm
thunderbird-debuginfo-78.4.3-1.el6_10.s390x.rpm

x86_64:
thunderbird-78.4.3-1.el6_10.x86_64.rpm
thunderbird-debuginfo-78.4.3-1.el6_10.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
thunderbird-78.4.3-1.el6_10.src.rpm

i386:
thunderbird-78.4.3-1.el6_10.i686.rpm

x86_64:
thunderbird-78.4.3-1.el6_10.x86_64.rpm
thunderbird-debuginfo-78.4.3-1.el6_10.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-2020-26950
https://access.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2020 Red Hat, Inc.
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