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Gentoo Linux Security Advisory                           GLSA 202012-20
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                                            https://security.gentoo.org/
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  Severity: Normal
     Title: Mozilla Firefox, Mozilla Thunderbird: Multiple
            vulnerabilities
      Date: December 23, 2020
      Bugs: #759097
        ID: 202012-20

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Synopsis
========

Multiple vulnerabilities have been found in Mozilla Firefox and Mozilla
Thunderbird, the worst of which could result in the arbitrary execution
of code.

Background
==========

Mozilla Firefox is a popular open-source web browser from the Mozilla
project.

Mozilla Thunderbird is a popular open-source email client from the
Mozilla project.

Affected packages
=================

     -------------------------------------------------------------------
      Package              /     Vulnerable     /            Unaffected
     -------------------------------------------------------------------
   1  www-client/firefox            < 84.0           >= 78.6.0:0/esr78
                                                               >= 84.0
   2  www-client/firefox-bin        < 84.0           >= 78.6.0:0/esr78
                                                               >= 84.0
   3  mail-client/thunderbird      < 78.6.0                  >= 78.6.0
   4  mail-client/thunderbird-bin
                                   < 78.6.0                  >= 78.6.0
     -------------------------------------------------------------------
      4 affected packages

Description
===========

Multiple vulnerabilities have been discovered in Mozilla Firefox and
Mozilla Thunderbird. Please review the CVE identifiers referenced below
for details.

Impact
======

Please review the referenced CVE identifiers for details.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Mozilla Firefox users should upgrade to the latest version:

   # emerge --sync
   # emerge --ask --oneshot --verbose ">=www-client/firefox-84.0"

All Mozilla Firefox (bin) users should upgrade to the latest version:

   # emerge --sync
   # emerge --ask --oneshot --verbose ">=www-client/firefox-bin-84.0"

All Mozilla Firefox ESR users should upgrade to the latest version:

   # emerge --sync
   # emerge --ask --oneshot -v ">=www-client/firefox-78.6.0:0/esr78"

All Mozilla Firefox ESR (bin) users should upgrade to the latest
version:

   # emerge --sync
   # emerge --ask --oneshot -v ">=www-client/firefox-bin-78.6.0:0/esr78"

All Mozilla Thunderbird users should upgrade to the latest version:

   # emerge --sync
   # emerge --ask --oneshot --verbose ">=mail-client/thunderbird-78.6.0"

All Mozilla Thunderbird (bin) users should upgrade to the latest
version:

   # emerge --sync
   # emerge --ask --oneshot -v ">=mail-client/thunderbird-bin-78.6.0"

References
==========

[ 1 ] CVE-2020-16042
       https://nvd.nist.gov/vuln/detail/CVE-2020-16042
[ 2 ] CVE-2020-26971
       https://nvd.nist.gov/vuln/detail/CVE-2020-26971
[ 3 ] CVE-2020-26973
       https://nvd.nist.gov/vuln/detail/CVE-2020-26973
[ 4 ] CVE-2020-26974
       https://nvd.nist.gov/vuln/detail/CVE-2020-26974
[ 5 ] CVE-2020-26978
       https://nvd.nist.gov/vuln/detail/CVE-2020-26978
[ 6 ] CVE-2020-35111
       https://nvd.nist.gov/vuln/detail/CVE-2020-35111
[ 7 ] CVE-2020-35113
       https://nvd.nist.gov/vuln/detail/CVE-2020-35113
[ 8 ] MFSA-2020-55
       https://www.mozilla.org/en-US/security/advisories/mfsa2020-55/
[ 9 ] MFSA-2020-56
       https://www.mozilla.org/en-US/security/advisories/mfsa2020-56/

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  https://security.gentoo.org/glsa/202012-20

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
[email protected] or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2020 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5