Type Confusion in Firefox ESR and Mozilla Firefox - CVE-2018-12386
Published: October 3, 2018 / Updated: April 12, 2020
Vulnerability identifier: #VU15149
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-2018-12386
CWE-ID: CWE-843
Exploitation vector: Remote access
Exploit availability:
Public exploit is 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 in register allocation within the JavaScript engine. A remote attacker can create a specially crafted web page, trick the victim into visiting it, trigger a type confusion error that will allow arbitrary read and write operations within the sandboxed content process.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Firefox ESR
Mozilla Firefox
Arch Linux
Debian Linux
Gentoo Linux
Red Hat Enterprise Linux for Power
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for ARM
Opensuse
Mozilla Firefox
Arch Linux
Debian Linux
Gentoo Linux
Red Hat Enterprise Linux for Power
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for ARM
Opensuse
How to mitigate CVE-2018-12386
Install updates from vendor's website.
Firefox ESR - update to 60.2.2
Mozilla Firefox - update to 62.0.3
Mozilla Firefox - update to 62.0.3