Buffer overflow in Mozilla Firefox - CVE-2021-23983
Published: March 23, 2021
Vulnerability identifier: #VU51663
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-2021-23983
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 transitions for invalid "::marker" properties by causing a transition on a parent node by removing a CSS rule. 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
Mozilla Firefox
Gentoo Linux
Ubuntu
firefox (Ubuntu package)
Gentoo Linux
Ubuntu
firefox (Ubuntu package)
How to mitigate CVE-2021-23983
Install updates from vendor's website.
Mozilla Firefox - update to 87.0
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
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