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

Synopsis:          Important: firefox security update
Advisory ID:       RHSA-2021:1360-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:1360
Issue date:        2021-04-26
CVE Names:         CVE-2021-23961 CVE-2021-23994 CVE-2021-23995 
                   CVE-2021-23998 CVE-2021-23999 CVE-2021-24002 
                   CVE-2021-29945 CVE-2021-29946 
=====================================================================

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 78.10.0 ESR.

Security Fix(es):

* Mozilla: Out of bound write due to lazy initialization (CVE-2021-23994)

* Mozilla: Use-after-free in Responsive Design Mode (CVE-2021-23995)

* Mozilla: More internal network hosts could have been probed by a
malicious webpage (CVE-2021-23961)

* Mozilla: Secure Lock icon could have been spoofed (CVE-2021-23998)

* Mozilla: Blob URLs may have been granted additional privileges
(CVE-2021-23999)

* Mozilla: Arbitrary FTP command execution on FTP servers using an encoded
URL (CVE-2021-24002)

* Mozilla: Incorrect size computation in WebAssembly JIT could lead to
null-reads (CVE-2021-29945)

* Mozilla: Port blocking could be bypassed (CVE-2021-29946)

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/):

1951364 - CVE-2021-23994 Mozilla: Out of bound write due to lazy initialization
1951365 - CVE-2021-23995 Mozilla: Use-after-free in Responsive Design Mode
1951366 - CVE-2021-23998 Mozilla: Secure Lock icon could have been spoofed
1951367 - CVE-2021-23961 Mozilla: More internal network hosts could have been
 probed by a malicious webpage
1951368 - CVE-2021-23999 Mozilla: Blob URLs may have been granted additional
 privileges
1951369 - CVE-2021-24002 Mozilla: Arbitrary FTP command execution on FTP
 servers using an encoded URL
1951370 - CVE-2021-29945 Mozilla: Incorrect size computation in WebAssembly JIT
 could lead to null-reads
1951371 - CVE-2021-29946 Mozilla: Port blocking could be bypassed

6. Package List:

Red Hat Enterprise Linux AppStream (v. 8):

Source:
firefox-78.10.0-1.el8_3.src.rpm

aarch64:
firefox-78.10.0-1.el8_3.aarch64.rpm
firefox-debuginfo-78.10.0-1.el8_3.aarch64.rpm
firefox-debugsource-78.10.0-1.el8_3.aarch64.rpm

ppc64le:
firefox-78.10.0-1.el8_3.ppc64le.rpm
firefox-debuginfo-78.10.0-1.el8_3.ppc64le.rpm
firefox-debugsource-78.10.0-1.el8_3.ppc64le.rpm

s390x:
firefox-78.10.0-1.el8_3.s390x.rpm
firefox-debuginfo-78.10.0-1.el8_3.s390x.rpm
firefox-debugsource-78.10.0-1.el8_3.s390x.rpm

x86_64:
firefox-78.10.0-1.el8_3.x86_64.rpm
firefox-debuginfo-78.10.0-1.el8_3.x86_64.rpm
firefox-debugsource-78.10.0-1.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-2021-23961
https://access.redhat.com/security/cve/CVE-2021-23994
https://access.redhat.com/security/cve/CVE-2021-23995
https://access.redhat.com/security/cve/CVE-2021-23998
https://access.redhat.com/security/cve/CVE-2021-23999
https://access.redhat.com/security/cve/CVE-2021-24002
https://access.redhat.com/security/cve/CVE-2021-29945
https://access.redhat.com/security/cve/CVE-2021-29946
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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