Type Confusion in Firefox ESR and Mozilla Firefox - CVE-2020-12415
Published: July 2, 2020 / Updated: July 31, 2020
Vulnerability identifier: #VU29450
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-2020-12415
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 due to missing sign-extension for ValueTags on ARM64. A remote attacker can pass specially crafted data to the application, 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
Opensuse
Ubuntu
firefox (Alpine package)
firefox (Ubuntu package)
Mozilla Thunderbird
Mozilla Firefox
Gentoo Linux
Opensuse
Ubuntu
firefox (Alpine package)
firefox (Ubuntu package)
Mozilla Thunderbird
How to mitigate CVE-2020-12415
Install updates from vendor's website.
Firefox ESR - update to 68.10.0
Mozilla Firefox - update to 78.0.1
firefox (Alpine package) - update to 78.0.1-r0
Mozilla Thunderbird - addressed in versions 68.10.0, 78.0
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 Firefox - update to 78.0.1
firefox (Alpine package) - update to 78.0.1-r0
Mozilla Thunderbird - addressed in versions 68.10.0, 78.0
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