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Red Hat Security Advisory 2021-0991-01

Red Hat Security Advisory 2021-0991-01
Posted Mar 25, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0991-01 - Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. This update upgrades Firefox to version 78.9.0 ESR. Issues addressed include a spoofing vulnerability.

tags | advisory, web, spoof
systems | linux, redhat
advisories | CVE-2021-23981, CVE-2021-23982, CVE-2021-23984, CVE-2021-23987
MD5 | 1731b7821447c2facdea627ff316d371

Red Hat Security Advisory 2021-0991-01

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

Synopsis: Important: firefox security update
Advisory ID: RHSA-2021:0991-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:0991
Issue date: 2021-03-25
CVE Names: CVE-2021-23981 CVE-2021-23982 CVE-2021-23984
CVE-2021-23987
=====================================================================

1. Summary:

An update for firefox 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 Critical. 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) - 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 78.9.0 ESR.

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

After installing the update, Firefox must be restarted for the changes 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 EUS (v. 8.1):

Source:
firefox-78.9.0-1.el8_1.src.rpm

aarch64:
firefox-78.9.0-1.el8_1.aarch64.rpm
firefox-debuginfo-78.9.0-1.el8_1.aarch64.rpm
firefox-debugsource-78.9.0-1.el8_1.aarch64.rpm

ppc64le:
firefox-78.9.0-1.el8_1.ppc64le.rpm
firefox-debuginfo-78.9.0-1.el8_1.ppc64le.rpm
firefox-debugsource-78.9.0-1.el8_1.ppc64le.rpm

s390x:
firefox-78.9.0-1.el8_1.s390x.rpm
firefox-debuginfo-78.9.0-1.el8_1.s390x.rpm
firefox-debugsource-78.9.0-1.el8_1.s390x.rpm

x86_64:
firefox-78.9.0-1.el8_1.x86_64.rpm
firefox-debuginfo-78.9.0-1.el8_1.x86_64.rpm
firefox-debugsource-78.9.0-1.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-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 <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2021 Red Hat, Inc.
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