Type Confusion in Firefox ESR and Mozilla Firefox - CVE-2021-23954

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU50022

Type Confusion in Firefox ESR and Mozilla Firefox - CVE-2021-23954

Published: January 26, 2021


Vulnerability identifier: #VU50022
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-2021-23954
CWE-ID: CWE-843
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 type confusion error when using the new logical assignment operators in a JavaScript switch statement. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger a type confusion error 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
Arch Linux
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - 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
Ubuntu
openEuler
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 (Alpine package)
thunderbird (Debian package)
firefox-esr (Debian package)
firefox (Red Hat package)
thunderbird (Red Hat package)
thunderbird (Alpine package)
mozjs78 (Alpine package)
thunderbird (Ubuntu package)
firefox
firefox-debuginfo
firefox-debugsource
mozilla-crashreporter-firefox-debuginfo
firefox (Ubuntu package)
Mozilla Thunderbird

How to mitigate CVE-2021-23954

Install updates from vendor's website.

Firefox ESR - update to 78.7.0
Mozilla Firefox - update to 85.0
Mozilla Thunderbird - update to 78.7.0
firefox-esr (Alpine package) - update to 78.7.0-r0
thunderbird (Debian package) - update to 78.7.0-1~deb10u1
firefox-esr (Debian package) - update to 78.7.0esr-1~deb10u1
firefox (Red Hat package) - addressed in versions 78.7.0-2.el7_9, 78.7.0-2.el8_1, 78.7.0-2.el8_2, 78.7.0-2.el8_3
thunderbird (Red Hat package) - addressed in versions 78.7.0-1.el7_9, 78.7.0-1.el8_1, 78.7.0-1.el8_2, 78.7.0-1.el8_3
thunderbird (Alpine package) - update to 78.7.0-r0
mozjs78 (Alpine package) - update to 78.7.0-r0
thunderbird (Ubuntu package) - update to 1:78.7.1+build1-0ubuntu0.20.10.4
firefox - update to 79.0-26
firefox-debuginfo - update to 79.0-26
firefox-debugsource - update to 79.0-26
mozilla-crashreporter-firefox-debuginfo - update to 79.0-26
firefox (Ubuntu package) - addressed in versions 85.0+build1-0ubuntu0.16.04.1, 85.0+build1-0ubuntu0.18.04.1, 85.0+build1-0ubuntu0.20.04.1, 85.0+build1-0ubuntu0.20.10.1

External References

Related Security Bulletins