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Red Hat Enterprise Linux 8: RHSA-2021-0990-01 Critical Firefox Update

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Calendar Grey March 25, 2021
Scroller Redhat
Important security update for Mozilla Firefox on Red Hat Enterprise Linux 8 resolves various vulnerabilities. Secure your system immediately!
An update for firefox is now available for Red Hat Enterprise Linux 8

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.

Summary

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.

Topics%20covered

Topics Covered

security advisory critical Red Hat Enterprise Linux firefox memory safety popup spoofing network probing

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

Package List

Red Hat Enterprise Linux AppStream (v. 8):
Source: firefox-78.9.0-1.el8_3.src.rpm
aarch64: firefox-78.9.0-1.el8_3.aarch64.rpm firefox-debuginfo-78.9.0-1.el8_3.aarch64.rpm firefox-debugsource-78.9.0-1.el8_3.aarch64.rpm
ppc64le: firefox-78.9.0-1.el8_3.ppc64le.rpm firefox-debuginfo-78.9.0-1.el8_3.ppc64le.rpm firefox-debugsource-78.9.0-1.el8_3.ppc64le.rpm
s390x: firefox-78.9.0-1.el8_3.s390x.rpm firefox-debuginfo-78.9.0-1.el8_3.s390x.rpm firefox-debugsource-78.9.0-1.el8_3.s390x.rpm
x86_64: firefox-78.9.0-1.el8_3.x86_64.rpm firefox-debuginfo-78.9.0-1.el8_3.x86_64.rpm firefox-debugsource-78.9.0-1.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/


Severity
critical
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:0990-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:0990
Issue date: 2021-03-25

Topic

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 impactof Critical. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory critical Red Hat Enterprise Linux firefox memory safety popup spoofing network probing

Relevant Releases Architectures

Red Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64

Bugs Fixed

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

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