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

Synopsis:          Important: firefox security update
Advisory ID:       RHSA-2021:4123-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:4123
Issue date:        2021-11-03
CVE Names:         CVE-2021-38503 CVE-2021-38504 CVE-2021-38506 
                   CVE-2021-38507 CVE-2021-38508 CVE-2021-38509 
=====================================================================

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 91.3.0 ESR.

Security Fix(es):

* Mozilla: Use-after-free in HTTP2 Session object

* Mozilla: Memory safety bugs fixed in Firefox 94 and Firefox ESR 91.3

* Mozilla: iframe sandbox rules did not apply to XSLT stylesheets
(CVE-2021-38503)

* Mozilla: Use-after-free in file picker dialog (CVE-2021-38504)

* Mozilla: Firefox could be coaxed into going into fullscreen mode without
notification or warning (CVE-2021-38506)

* Mozilla: Opportunistic Encryption in HTTP2 could be used to bypass the
Same-Origin-Policy on services hosted on other ports (CVE-2021-38507)

* Mozilla: Permission Prompt could be overlaid, resulting in user confusion
and potential spoofing (CVE-2021-38508)

* Mozilla: Javascript alert box could have been spoofed onto an arbitrary
domain (CVE-2021-38509)

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/):

2019621 - CVE-2021-38503 Mozilla: iframe sandbox rules did not apply to XSLT stylesheets
2019622 - CVE-2021-38504 Mozilla: Use-after-free in file picker dialog
2019624 - CVE-2021-38506 Mozilla: Firefox could be coaxed into going into fullscreen mode without notification or warning
2019625 - CVE-2021-38507 Mozilla: Opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services hosted on other ports
2019626 - Mozilla: Use-after-free in HTTP2 Session object
2019627 - CVE-2021-38508 Mozilla: Permission Prompt could be overlaid, resulting in user confusion and potential spoofing
2019628 - CVE-2021-38509 Mozilla: Javascript alert box could have been spoofed onto an arbitrary domain
2019630 - Mozilla: Memory safety bugs fixed in Firefox 94 and Firefox ESR 91.3

6. Package List:

Red Hat Enterprise Linux AppStream (v. 8):

Source:
firefox-91.3.0-1.el8_4.src.rpm

aarch64:
firefox-91.3.0-1.el8_4.aarch64.rpm
firefox-debuginfo-91.3.0-1.el8_4.aarch64.rpm
firefox-debugsource-91.3.0-1.el8_4.aarch64.rpm

ppc64le:
firefox-91.3.0-1.el8_4.ppc64le.rpm
firefox-debuginfo-91.3.0-1.el8_4.ppc64le.rpm
firefox-debugsource-91.3.0-1.el8_4.ppc64le.rpm

s390x:
firefox-91.3.0-1.el8_4.s390x.rpm
firefox-debuginfo-91.3.0-1.el8_4.s390x.rpm
firefox-debugsource-91.3.0-1.el8_4.s390x.rpm

x86_64:
firefox-91.3.0-1.el8_4.x86_64.rpm
firefox-debuginfo-91.3.0-1.el8_4.x86_64.rpm
firefox-debugsource-91.3.0-1.el8_4.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-2021-38503
https://access.redhat.com/security/cve/CVE-2021-38504
https://access.redhat.com/security/cve/CVE-2021-38506
https://access.redhat.com/security/cve/CVE-2021-38507
https://access.redhat.com/security/cve/CVE-2021-38508
https://access.redhat.com/security/cve/CVE-2021-38509
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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