Use-fater-free in Mozilla Firefox and Firefox ESR - CVE-2021-23995

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Main Vulnerability Database Vulnerabilities #VU52334

Use-fater-free in Mozilla Firefox and Firefox ESR - CVE-2021-23995

Published: April 19, 2021


Vulnerability identifier: #VU52334
CSH Severity: High
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-23995
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted input, when Responsive Design Mode is enabled. A remote attacker can create a specially crafted web page, trick the victim into opening it using the affected software, trigger a use-after-fee error and execute arbitrary code on the target system.


Affected software

Mozilla Firefox
Firefox ESR
Arch Linux
Gentoo Linux
SUSE Manager Proxy
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE CaaS Platform
SUSE Enterprise Storage
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64
Anolis OS
SUSE OpenStack Cloud Crowbar
HPE Helion Openstack
SUSE OpenStack Cloud
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux Server - TUS
SUSE Linux Enterprise Debuginfo
SUSE Linux Enterprise Server
SUSE Linux Enterprise Server for SAP
SUSE Linux Enterprise Software Development Kit
SUSE Linux Enterprise High Performance Computing
SUSE Linux Enterprise Module for Desktop Applications
SUSE Linux Enterprise Workstation Extension
Ubuntu
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
firefox-esr (Debian package)
firefox (Red Hat package)
thunderbird (Red Hat package)
firefox
thunderbird
MozillaFirefox-translations-other
MozillaFirefox-translations-common
MozillaFirefox-devel
MozillaFirefox-debugsource
MozillaFirefox-debuginfo
MozillaFirefox
MozillaThunderbird-translations-other
MozillaThunderbird-translations-common
MozillaThunderbird-debugsource
MozillaThunderbird-debuginfo
MozillaThunderbird
firefox (Ubuntu package)
IBM Cloud Application Performance Management (APM)
Mozilla Thunderbird

How to mitigate CVE-2021-23995

Install updates from vendor's website.

Mozilla Firefox - update to 88.0
Firefox ESR - update to 78.10.0
Mozilla Thunderbird - update to 78.10.0
firefox-esr (Debian package) - update to 78.10.0esr-1~deb10u1
firefox (Red Hat package) - addressed in versions 78.10.0-1.el7_9, 78.10.0-1.el8_1, 78.10.0-1.el8_2, 78.10.0-1.el8_3
thunderbird (Red Hat package) - addressed in versions 78.10.0-1.el7_9, 78.10.0-1.el8_1, 78.10.0-1.el8_2, 78.10.0-1.el8_3
firefox - update to 78.10.0-1.0.1
thunderbird - update to 78.10.0-1.0.1
MozillaFirefox-translations-other - addressed in versions 78.10.0-3.139.1, 78.10.0-8.38.1, 78.10.0-78.126.1
MozillaFirefox-translations-common - addressed in versions 78.10.0-3.139.1, 78.10.0-8.38.1, 78.10.0-78.126.1, 78.10.0-112.57.2
MozillaFirefox-devel - addressed in versions 78.10.0-3.139.1, 78.10.0-8.38.1, 78.10.0-112.57.2
MozillaFirefox-debugsource - addressed in versions 78.10.0-3.139.1, 78.10.0-8.38.1, 78.10.0-112.57.2
MozillaFirefox-debuginfo - addressed in versions 78.10.0-3.139.1, 78.10.0-8.38.1, 78.10.0-78.126.1, 78.10.0-112.57.2
MozillaFirefox - addressed in versions 78.10.0-3.139.1, 78.10.0-8.38.1, 78.10.0-78.126.1, 78.10.0-112.57.2
MozillaThunderbird-translations-other - update to 78.10.0-8.23.1
MozillaThunderbird-translations-common - update to 78.10.0-8.23.1
MozillaThunderbird-debugsource - update to 78.10.0-8.23.1
MozillaThunderbird-debuginfo - update to 78.10.0-8.23.1
MozillaThunderbird - update to 78.10.0-8.23.1
firefox (Ubuntu package) - addressed in versions 88.0+build2-0ubuntu0.16.04.1, 88.0+build2-0ubuntu0.18.04.2, 88.0+build2-0ubuntu0.20.04.1, 88.0+build2-0ubuntu0.20.10.1, 88.0+build2-0ubuntu0.21.04.1

External References

Related Security Bulletins