Buffer overflow in Mozilla Firefox - CVE-2020-12426
Published: July 2, 2020 / Updated: July 31, 2020
Vulnerability identifier: #VU29465
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-2020-12426
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
Mozilla Firefox
Gentoo Linux
Opensuse
Ubuntu
Mozilla Thunderbird
firefox (Alpine package)
firefox (Ubuntu package)
Gentoo Linux
Opensuse
Ubuntu
Mozilla Thunderbird
firefox (Alpine package)
firefox (Ubuntu package)
How to mitigate CVE-2020-12426
Install updates from vendor's website.
Mozilla Firefox - update to 78.0.1
Mozilla Thunderbird - addressed in versions 68.10.0, 78.0
firefox (Alpine package) - update to 78.0.1-r0
firefox (Ubuntu package) - addressed in versions 78.0.1+build1-0ubuntu0.16.04.1, 78.0.1+build1-0ubuntu0.18.04.1, 78.0.1+build1-0ubuntu0.19.10.1, 78.0.1+build1-0ubuntu0.20.04.1
Mozilla Thunderbird - addressed in versions 68.10.0, 78.0
firefox (Alpine package) - update to 78.0.1-r0
firefox (Ubuntu package) - addressed in versions 78.0.1+build1-0ubuntu0.16.04.1, 78.0.1+build1-0ubuntu0.18.04.1, 78.0.1+build1-0ubuntu0.19.10.1, 78.0.1+build1-0ubuntu0.20.04.1