[RHSA-2021:3791-01] Important: firefox security update

Tue Oct 12 14:23:03 UTC 2021

An update for firefox is now available for Red Hat Enterprise Linux 7.

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 Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - 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 91.2.0 ESR.

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)

* 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

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

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
firefox-91.2.0-4.el7_9.src.rpm

x86_64:
firefox-91.2.0-4.el7_9.x86_64.rpm
firefox-debuginfo-91.2.0-4.el7_9.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
firefox-91.2.0-4.el7_9.i686.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
firefox-91.2.0-4.el7_9.src.rpm

ppc64:
firefox-91.2.0-4.el7_9.ppc64.rpm
firefox-debuginfo-91.2.0-4.el7_9.ppc64.rpm

ppc64le:
firefox-91.2.0-4.el7_9.ppc64le.rpm
firefox-debuginfo-91.2.0-4.el7_9.ppc64le.rpm

s390x:
firefox-91.2.0-4.el7_9.s390x.rpm
firefox-debuginfo-91.2.0-4.el7_9.s390x.rpm

x86_64:
firefox-91.2.0-4.el7_9.x86_64.rpm
firefox-debuginfo-91.2.0-4.el7_9.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

x86_64:
firefox-91.2.0-4.el7_9.i686.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
firefox-91.2.0-4.el7_9.src.rpm

x86_64:
firefox-91.2.0-4.el7_9.x86_64.rpm
firefox-debuginfo-91.2.0-4.el7_9.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
firefox-91.2.0-4.el7_9.i686.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/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert at redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2021 Red Hat, Inc.
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