-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

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

Synopsis:          Important: firefox security update
Advisory ID:       RHSA-2021:4116-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:4116
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 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 91.3.0 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 Client (v. 7):

Source:
firefox-91.3.0-1.el7_9.src.rpm

x86_64:
firefox-91.3.0-1.el7_9.x86_64.rpm
firefox-debuginfo-91.3.0-1.el7_9.x86_64.rpm

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

x86_64:
firefox-91.3.0-1.el7_9.i686.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
firefox-91.3.0-1.el7_9.src.rpm

ppc64:
firefox-91.3.0-1.el7_9.ppc64.rpm
firefox-debuginfo-91.3.0-1.el7_9.ppc64.rpm

ppc64le:
firefox-91.3.0-1.el7_9.ppc64le.rpm
firefox-debuginfo-91.3.0-1.el7_9.ppc64le.rpm

s390x:
firefox-91.3.0-1.el7_9.s390x.rpm
firefox-debuginfo-91.3.0-1.el7_9.s390x.rpm

x86_64:
firefox-91.3.0-1.el7_9.x86_64.rpm
firefox-debuginfo-91.3.0-1.el7_9.x86_64.rpm

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

x86_64:
firefox-91.3.0-1.el7_9.i686.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
firefox-91.3.0-1.el7_9.src.rpm

x86_64:
firefox-91.3.0-1.el7_9.x86_64.rpm
firefox-debuginfo-91.3.0-1.el7_9.x86_64.rpm

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

x86_64:
firefox-91.3.0-1.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-2021-38503
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.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1
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7jpj
-----END PGP SIGNATURE-----

--
RHSA-announce mailing list
RHSA-announce@redhat.com
https://listman.redhat.com/mailman/listinfo/rhsa-announce