Type Confusion in Mozilla Firefox and Firefox ESR - CVE-2019-17026
Published: January 8, 2020 / Updated: May 13, 2022
Vulnerability identifier: #VU24147
CSH Severity: Critical
CVSS v4.0: 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/E:A/U:Red
CVE-ID: CVE-2019-17026
CWE-ID: CWE-843
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vendor: Mozilla
Affected software:
Mozilla Firefox
Firefox ESR
Mozilla Firefox
Firefox ESR
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a type confusion error with StoreElementHole and FallibleStoreElement when processing HTML content in IonMonkey JIT compiler. A remote attacker can create a specially crafted webpage, trick the victim into visiting it, 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.
Note, this vulnerability is being actively exploited in the wild.
How to mitigate CVE-2019-17026
Update to Firefox 72.0.1 or Firefox ESR 68.4.1.