Buffer overflow in Firefox ESR and Mozilla Firefox - CVE-2021-23987

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Main Vulnerability Database Vulnerabilities #VU51667

Buffer overflow in Firefox ESR and Mozilla Firefox - CVE-2021-23987

Published: March 23, 2021 / Updated: April 8, 2021


Vulnerability identifier: #VU51667
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-2021-23987
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing HTML content. A remote attacker can create a specially crafted website, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


Affected software

Firefox ESR
Mozilla Firefox
Gentoo Linux
SUSE CaaS Platform
SUSE Manager Proxy
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE MicroOS
SUSE Enterprise Storage
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Server
CentOS
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for Power, little endian
SUSE OpenStack Cloud
SUSE OpenStack Cloud Crowbar
HPE Helion Openstack
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64
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 for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux Server - AUS
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 Module for Basesystem
SUSE Linux Enterprise Workstation Extension
Ubuntu
Mozilla Thunderbird
firefox-esr (Debian package)
thunderbird (Debian package)
firefox (Red Hat package)
mozilla-nspr-devel
mozilla-nspr-32bit
mozilla-nspr-32bit-debuginfo
mozilla-nspr
mozilla-nspr-debuginfo
mozilla-nspr-debugsource
MozillaFirefox-branding-SLE
thunderbird (Red Hat package)
MozillaFirefox-devel
MozillaFirefox-translations-common
MozillaFirefox-translations-other
MozillaFirefox-debuginfo
MozillaFirefox
MozillaFirefox-debugsource
MozillaThunderbird-translations-other
MozillaThunderbird-translations-common
MozillaThunderbird-debugsource
MozillaThunderbird-debuginfo
MozillaThunderbird
firefox (Ubuntu package)
Dell EMC Unity XT Operating Environment (OE)
Dell EMC Unity VSA Operating Environment (OE)
Dell EMC Unity Operating Environment (OE)

How to mitigate CVE-2021-23987

Install updates from vendor's website.

Firefox ESR - update to 78.9.0
Mozilla Firefox - update to 87.0
Mozilla Thunderbird - update to 78.9.0
firefox-esr (Debian package) - update to 78.9.0esr-1~deb10u1
thunderbird (Debian package) - update to 78.9.0-1~deb10u1
firefox (Red Hat package) - addressed in versions 78.9.0-1.el7_9, 78.9.0-1.el8_1, 78.9.0-1.el8_2, 78.9.0-1.el8_3
mozilla-nspr-devel - update to 4.25.1-3.17.1
mozilla-nspr-32bit - update to 4.25.1-3.17.1
mozilla-nspr-32bit-debuginfo - update to 4.25.1-3.17.1
mozilla-nspr - update to 4.25.1-3.17.1
mozilla-nspr-debuginfo - update to 4.25.1-3.17.1
mozilla-nspr-debugsource - update to 4.25.1-3.17.1
Dell EMC Unity XT Operating Environment (OE) - update to 5.1.2.0.5.007
Dell EMC Unity VSA Operating Environment (OE) - update to 5.1.2.0.5.007
Dell EMC Unity Operating Environment (OE) - update to 5.1.2.0.5.007
MozillaFirefox-branding-SLE - update to 78-4.16.1
thunderbird (Red Hat package) - addressed in versions 78.9.0-3.el7_9, 78.9.0-3.el8_1, 78.9.0-3.el8_2, 78.9.0-3.el8_3
MozillaFirefox-devel - addressed in versions 78.9.0-3.136.1, 78.9.0-8.35.1, 78.9.0-112.54.1
MozillaFirefox-translations-common - addressed in versions 78.9.0-3.136.1, 78.9.0-8.35.1, 78.9.0-78.123.1, 78.9.0-112.54.1
MozillaFirefox-translations-other - addressed in versions 78.9.0-3.136.1, 78.9.0-8.35.1, 78.9.0-78.123.1
MozillaFirefox-debuginfo - addressed in versions 78.9.0-3.136.1, 78.9.0-8.35.1, 78.9.0-78.123.1, 78.9.0-112.54.1
MozillaFirefox - addressed in versions 78.9.0-3.136.1, 78.9.0-8.35.1, 78.9.0-78.123.1, 78.9.0-112.54.1
MozillaFirefox-debugsource - addressed in versions 78.9.0-3.136.1, 78.9.0-8.35.1, 78.9.0-112.54.1
MozillaThunderbird-translations-other - update to 78.9.1-8.20.1
MozillaThunderbird-translations-common - update to 78.9.1-8.20.1
MozillaThunderbird-debugsource - update to 78.9.1-8.20.1
MozillaThunderbird-debuginfo - update to 78.9.1-8.20.1
MozillaThunderbird - update to 78.9.1-8.20.1
firefox (Ubuntu package) - addressed in versions 87.0+build3-0ubuntu0.16.04.2, 87.0+build3-0ubuntu0.18.04.2, 87.0+build3-0ubuntu0.20.04.2, 87.0+build3-0ubuntu0.20.10.1

External References

Related Security Bulletins