Buffer overflow in Firefox ESR and Mozilla Firefox - CVE-2021-38493

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Main Vulnerability Database Vulnerabilities #VU56374

Buffer overflow in Firefox ESR and Mozilla Firefox - CVE-2021-38493

Published: September 7, 2021 / Updated: September 8, 2021


Vulnerability identifier: #VU56374
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-2021-38493
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 web page, 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
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 x86_64
Red Hat Enterprise Linux for ARM 64
Anolis OS
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 for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux Server - AUS
SUSE Linux Enterprise Workstation Extension
Ubuntu
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
firefox-esr (Debian package)
thunderbird (Debian package)
firefox (Red Hat package)
thunderbird (Red Hat package)
thunderbird (Ubuntu package)
MozillaThunderbird-translations-other
MozillaThunderbird-translations-common
MozillaThunderbird-debugsource
MozillaThunderbird
MozillaThunderbird-debuginfo
firefox
thunderbird
mail-client/thunderbird-bin
mail-client/thunderbird
firefox (Ubuntu package)
Mozilla Thunderbird
IBM Cloud Pak for Multicloud Management Monitoring

How to mitigate CVE-2021-38493

Install updates from vendor's website.

Firefox ESR - update to 78.14.0
Mozilla Firefox - update to 92.0
Mozilla Thunderbird - update to 78.14.0
firefox-esr (Debian package) - addressed in versions 78.14.0esr-1~deb10u1, 78.14.0esr-1~deb11u1
thunderbird (Debian package) - addressed in versions 1:78.14.0-1~deb10u1, 1:78.14.0-1~deb11u1
firefox (Red Hat package) - addressed in versions 78.14.0-1.el7_9, 78.14.0-1.el8_1, 78.14.0-1.el8_2, 78.14.0-1.el8_4
thunderbird (Red Hat package) - addressed in versions 78.14.0-1.el7_9, 78.14.0-1.el8_1, 78.14.0-1.el8_2, 78.14.0-1.el8_4
IBM Cloud Pak for Multicloud Management Monitoring - update to 2.3 Fix Pack 6
thunderbird (Ubuntu package) - addressed in versions 1:78.14.0+build1-0ubuntu0.18.04.1, 1:78.14.0+build1-0ubuntu0.20.04.1, 1:78.14.0+build1-0ubuntu0.21.04.1
MozillaThunderbird-translations-other - update to 91.4.0-8.45.2
MozillaThunderbird-translations-common - update to 91.4.0-8.45.2
MozillaThunderbird-debugsource - update to 91.4.0-8.45.2
MozillaThunderbird - update to 91.4.0-8.45.2
MozillaThunderbird-debuginfo - update to 91.4.0-8.45.2
firefox - update to 91.6.0-1.0.1
thunderbird - update to 91.6.0-1.0.1
mail-client/thunderbird-bin - update to 91.12.0
mail-client/thunderbird - update to 91.12.0
firefox (Ubuntu package) - addressed in versions 92.0+build3-0ubuntu0.18.04.1, 92.0+build3-0ubuntu0.20.04.1, 92.0+build3-0ubuntu0.21.04.1

External References

Related Security Bulletins