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

Synopsis:          Important: firefox security update
Advisory ID:       RHSA-2021:0288-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:0288
Issue date:        2021-01-27
CVE Names:         CVE-2020-26976 CVE-2021-23953 CVE-2021-23954 
                   CVE-2021-23960 CVE-2021-23964 
=====================================================================

1. Summary:

An update for firefox 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, s390x, x86_64

3. Description:

Mozilla Firefox is an open-source web browser, designed for standards
compliance, performance, and portability.

This update upgrades Firefox to version 78.7.0 ESR.

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: 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

After installing the update, Firefox must be restarted for the changes 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

6. Package List:

Red Hat Enterprise Linux AppStream (v. 8):

Source:
firefox-78.7.0-2.el8_3.src.rpm

aarch64:
firefox-78.7.0-2.el8_3.aarch64.rpm
firefox-debuginfo-78.7.0-2.el8_3.aarch64.rpm
firefox-debugsource-78.7.0-2.el8_3.aarch64.rpm

ppc64le:
firefox-78.7.0-2.el8_3.ppc64le.rpm
firefox-debuginfo-78.7.0-2.el8_3.ppc64le.rpm
firefox-debugsource-78.7.0-2.el8_3.ppc64le.rpm

s390x:
firefox-78.7.0-2.el8_3.s390x.rpm
firefox-debuginfo-78.7.0-2.el8_3.s390x.rpm
firefox-debugsource-78.7.0-2.el8_3.s390x.rpm

x86_64:
firefox-78.7.0-2.el8_3.x86_64.rpm
firefox-debuginfo-78.7.0-2.el8_3.x86_64.rpm
firefox-debugsource-78.7.0-2.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-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 <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2021 Red Hat, Inc.
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