A thunderbird security update has been released for Red Hat Enterprise Linux 8.

RHSA-2021:0993-01: Important: thunderbird security update

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Red Hat Security Advisory

Synopsis: Important: thunderbird security update
Advisory ID: RHSA-2021:0993-01
Product: Red Hat Enterprise Linux
Advisory URL:   https://access.redhat.com/errata/RHSA-2021:0993
Issue date: 2021-03-25
CVE Names: CVE-2021-23981 CVE-2021-23982 CVE-2021-23984
CVE-2021-23987
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1. Summary:

An update for thunderbird 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) - aarch64, ppc64le, x86_64

3. Description:

Mozilla Thunderbird is a standalone mail and newsgroup client.

This update upgrades Thunderbird to version 78.9.0.

Security Fix(es):

* Mozilla: Texture upload into an unbound backing buffer resulted in an
out-of-bound read (CVE-2021-23981)

* Mozilla: Memory safety bugs fixed in Firefox 87 and Firefox ESR 78.9
(CVE-2021-23987)

* Mozilla: Internal network hosts could have been probed by a malicious
webpage (CVE-2021-23982)

* Mozilla: Malicious extensions could have spoofed popup information
(CVE-2021-23984)

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/):

1942783 - CVE-2021-23981 Mozilla: Texture upload into an unbound backing buffer resulted in an out-of-bound read
1942785 - CVE-2021-23982 Mozilla: Internal network hosts could have been probed by a malicious webpage
1942786 - CVE-2021-23984 Mozilla: Malicious extensions could have spoofed popup information
1942787 - CVE-2021-23987 Mozilla: Memory safety bugs fixed in Firefox 87 and Firefox ESR 78.9

6. Package List:

Red Hat Enterprise Linux AppStream (v. 8):

Source:
thunderbird-78.9.0-3.el8_3.src.rpm

aarch64:
thunderbird-78.9.0-3.el8_3.aarch64.rpm
thunderbird-debuginfo-78.9.0-3.el8_3.aarch64.rpm
thunderbird-debugsource-78.9.0-3.el8_3.aarch64.rpm

ppc64le:
thunderbird-78.9.0-3.el8_3.ppc64le.rpm
thunderbird-debuginfo-78.9.0-3.el8_3.ppc64le.rpm
thunderbird-debugsource-78.9.0-3.el8_3.ppc64le.rpm

x86_64:
thunderbird-78.9.0-3.el8_3.x86_64.rpm
thunderbird-debuginfo-78.9.0-3.el8_3.x86_64.rpm
thunderbird-debugsource-78.9.0-3.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-2021-23981
  https://access.redhat.com/security/cve/CVE-2021-23982
  https://access.redhat.com/security/cve/CVE-2021-23984
  https://access.redhat.com/security/cve/CVE-2021-23987
  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 2021 Red Hat, Inc.