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

Synopsis:          Important: thunderbird security update
Advisory ID:       RHSA-2020:5618-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2020:5618
Issue date:        2020-12-17
CVE Names:         CVE-2020-16042 CVE-2020-26971 CVE-2020-26973 
                   CVE-2020-26974 CVE-2020-26978 CVE-2020-35111 
                   CVE-2020-35113 
=====================================================================

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 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 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 78.6.0.

Security Fix(es):

* chromium-browser: Uninitialized Use in V8 (CVE-2020-16042)

* Mozilla: Heap buffer overflow in WebGL (CVE-2020-26971)

* Mozilla: CSS Sanitizer performed incorrect sanitization (CVE-2020-26973)

* Mozilla: Incorrect cast of StyleGenericFlexBasis resulted in a heap
use-after-free (CVE-2020-26974)

* Mozilla: Memory safety bugs fixed in Firefox 84 and Firefox ESR 78.6
(CVE-2020-35113)

* Mozilla: Internal network hosts could have been probed by a malicious
webpage (CVE-2020-26978)

* Mozilla: The proxy.onRequest API did not catch view-source URLs
(CVE-2020-35111)

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/):

1904515 - CVE-2020-16042 chromium-browser: Uninitialized Use in V8
1908022 - CVE-2020-26971 Mozilla: Heap buffer overflow in WebGL
1908023 - CVE-2020-26973 Mozilla: CSS Sanitizer performed incorrect
 sanitization
1908024 - CVE-2020-26974 Mozilla: Incorrect cast of StyleGenericFlexBasis
 resulted in a heap use-after-free
1908025 - CVE-2020-26978 Mozilla: Internal network hosts could have been probed
 by a malicious webpage
1908027 - CVE-2020-35111 Mozilla: The proxy.onRequest API did not catch
 view-source URLs
1908029 - CVE-2020-35113 Mozilla: Memory safety bugs fixed in Firefox 84 and
 Firefox ESR 78.6

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
thunderbird-78.6.0-1.el7_9.src.rpm

x86_64:
thunderbird-78.6.0-1.el7_9.x86_64.rpm
thunderbird-debuginfo-78.6.0-1.el7_9.x86_64.rpm

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

Source:
thunderbird-78.6.0-1.el7_9.src.rpm

ppc64le:
thunderbird-78.6.0-1.el7_9.ppc64le.rpm
thunderbird-debuginfo-78.6.0-1.el7_9.ppc64le.rpm

x86_64:
thunderbird-78.6.0-1.el7_9.x86_64.rpm
thunderbird-debuginfo-78.6.0-1.el7_9.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
thunderbird-78.6.0-1.el7_9.src.rpm

x86_64:
thunderbird-78.6.0-1.el7_9.x86_64.rpm
thunderbird-debuginfo-78.6.0-1.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-2020-16042
https://access.redhat.com/security/cve/CVE-2020-26971
https://access.redhat.com/security/cve/CVE-2020-26973
https://access.redhat.com/security/cve/CVE-2020-26974
https://access.redhat.com/security/cve/CVE-2020-26978
https://access.redhat.com/security/cve/CVE-2020-35111
https://access.redhat.com/security/cve/CVE-2020-35113
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 2020 Red Hat, Inc.
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