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Red Hat Security Advisory
Synopsis: Important: thunderbird security update
Advisory ID: RHSA-2021:0397-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:0397
Issue date: 2021-02-03
CVE Names: CVE-2020-15685 CVE-2020-26976 CVE-2021-23953
CVE-2021-23954 CVE-2021-23960 CVE-2021-23964
====================================================================
1. Summary:
An update for thunderbird is now available for Red Hat Enterprise Linux 8.1
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. 8.1) - ppc64le, x86_64
3. Description:
Mozilla Thunderbird is a standalone mail and newsgroup client.
This update upgrades Thunderbird to version 78.7.0.
Security Fix(es):
* Mozilla: Cross-origin information leakage via redirected PDF requests
(CVE-2021-23953)
* Mozilla: Type confusion when using logical assignment operators in
JavaScript switch statements (CVE-2021-23954)
* Mozilla: Memory safety bugs fixed in Firefox 85 and Firefox ESR 78.7
(CVE-2021-23964)
* Mozilla: IMAP Response Injection when using STARTTLS (CVE-2020-15685)
* Mozilla: HTTPS pages could have been intercepted by a registered service
worker when they should not have been (CVE-2020-26976)
* Mozilla: Use-after-poison for incorrectly redeclared JavaScript variables
during GC (CVE-2021-23960)
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/):
1920646 - CVE-2021-23953 Mozilla: Cross-origin information leakage via redirected PDF requests
1920648 - CVE-2021-23954 Mozilla: Type confusion when using logical assignment operators in JavaScript switch statements
1920649 - CVE-2020-26976 Mozilla: HTTPS pages could have been intercepted by a registered service worker when they should not have been
1920650 - CVE-2021-23960 Mozilla: Use-after-poison for incorrectly redeclared JavaScript variables during GC
1920651 - CVE-2021-23964 Mozilla: Memory safety bugs fixed in Firefox 85 and Firefox ESR 78.7
1921543 - CVE-2020-15685 Mozilla: IMAP Response Injection when using STARTTLS
6. Package List:
Red Hat Enterprise Linux AppStream EUS (v. 8.1):
Source:
thunderbird-78.7.0-1.el8_1.src.rpm
ppc64le:
thunderbird-78.7.0-1.el8_1.ppc64le.rpm
thunderbird-debuginfo-78.7.0-1.el8_1.ppc64le.rpm
thunderbird-debugsource-78.7.0-1.el8_1.ppc64le.rpm
x86_64:
thunderbird-78.7.0-1.el8_1.x86_64.rpm
thunderbird-debuginfo-78.7.0-1.el8_1.x86_64.rpm
thunderbird-debugsource-78.7.0-1.el8_1.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-2020-15685
https://access.redhat.com/security/cve/CVE-2020-26976
https://access.redhat.com/security/cve/CVE-2021-23953
https://access.redhat.com/security/cve/CVE-2021-23954
https://access.redhat.com/security/cve/CVE-2021-23960
https://access.redhat.com/security/cve/CVE-2021-23964
https://access.redhat.com/security/updates/classification/#important
8. Contact:
The Red Hat security contact is <[email protected]>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2021 Red Hat, Inc.
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