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

Synopsis:          Important: thunderbird security update
Advisory ID:       RHSA-2021:3839-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:3839
Issue date:        2021-10-13
CVE Names:         CVE-2021-32810 CVE-2021-38496 CVE-2021-38497 
                   CVE-2021-38498 CVE-2021-38500 CVE-2021-38501 
                   CVE-2021-38502 
=====================================================================

1. Summary:

An update for thunderbird is now available for Red Hat Enterprise Linux 8.2
Extended Update Support.

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 EUS (v. 8.2) - aarch64, ppc64le, x86_64

3. Description:

Mozilla Thunderbird is a standalone mail and newsgroup client.

This update upgrades Thunderbird to version 91.2.0.

Security Fix(es):

* Mozilla: Use-after-free in MessageTask (CVE-2021-38496)

* Mozilla: Memory safety bugs fixed in Firefox 93, Firefox ESR 78.15, and
Firefox ESR 91.2 (CVE-2021-38500)

* Mozilla: Memory safety bugs fixed in Firefox 93 and Firefox ESR 91.2
(CVE-2021-38501)

* Mozilla: Downgrade attack on SMTP STARTTLS connections (CVE-2021-38502)

* rust-crossbeam-deque: race condition may lead to double free
(CVE-2021-32810)

* Mozilla: Validation message could have been overlaid on another origin
(CVE-2021-38497)

* Mozilla: Use-after-free of nsLanguageAtomService object (CVE-2021-38498)

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/):

1990342 - CVE-2021-32810 rust-crossbeam-deque: race condition may lead to
 double free
2011097 - CVE-2021-38496 Mozilla: Use-after-free in MessageTask
2011098 - CVE-2021-38497 Mozilla: Validation message could have been overlaid
 on another origin
2011099 - CVE-2021-38498 Mozilla: Use-after-free of nsLanguageAtomService
 object
2011100 - CVE-2021-38500 Mozilla: Memory safety bugs fixed in Firefox 93,
 Firefox ESR 78.15, and Firefox ESR 91.2
2011101 - CVE-2021-38501 Mozilla: Memory safety bugs fixed in Firefox 93 and
 Firefox ESR 91.2
2013469 - CVE-2021-38502 Mozilla: Downgrade attack on SMTP STARTTLS connections

6. Package List:

Red Hat Enterprise Linux AppStream EUS (v. 8.2):

Source:
thunderbird-91.2.0-1.el8_2.src.rpm

aarch64:
thunderbird-91.2.0-1.el8_2.aarch64.rpm
thunderbird-debuginfo-91.2.0-1.el8_2.aarch64.rpm
thunderbird-debugsource-91.2.0-1.el8_2.aarch64.rpm

ppc64le:
thunderbird-91.2.0-1.el8_2.ppc64le.rpm
thunderbird-debuginfo-91.2.0-1.el8_2.ppc64le.rpm
thunderbird-debugsource-91.2.0-1.el8_2.ppc64le.rpm

x86_64:
thunderbird-91.2.0-1.el8_2.x86_64.rpm
thunderbird-debuginfo-91.2.0-1.el8_2.x86_64.rpm
thunderbird-debugsource-91.2.0-1.el8_2.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-2021-32810
https://access.redhat.com/security/cve/CVE-2021-38496
https://access.redhat.com/security/cve/CVE-2021-38497
https://access.redhat.com/security/cve/CVE-2021-38498
https://access.redhat.com/security/cve/CVE-2021-38500
https://access.redhat.com/security/cve/CVE-2021-38501
https://access.redhat.com/security/cve/CVE-2021-38502
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 2021 Red Hat, Inc.
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