Buffer overflow in Mozilla Firefox - CVE-2021-23962
Published: January 26, 2021
Vulnerability identifier: #VU50031
CSH Severity: Medium
CVSS v4: 7.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-23962
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 in nsTreeBodyFrame::RowCountChanged. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger memory corruption, which results in a user-after-poison 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
Arch Linux
Ubuntu
firefox (Ubuntu package)
Gentoo Linux
Arch Linux
Ubuntu
firefox (Ubuntu package)
How to mitigate CVE-2021-23962
Install updates from vendor's website.
Mozilla Firefox - update to 85.0
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
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