Type confusion in Mozilla Firefox - CVE-2019-9795

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Main Vulnerability Database Vulnerabilities #VU18034

Type confusion in Mozilla Firefox - CVE-2019-9795

Published: March 21, 2019 / Updated: March 21, 2019


Vulnerability identifier: #VU18034
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-2019-9795
CWE-ID: CWE-843
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a type confusion error within the IonMonkey just-in-time (JIT) compiler. A remote attacker can trick the victim to visit a specially crafted web page, trigger type confusion error and execute arbitrary code on the system with privileges of the current user.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.


Affected software

Mozilla Firefox
Firefox ESR
Arch Linux
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 x86_64
Red Hat Enterprise Linux for Power
Opensuse
Ubuntu
SUSE Package Hub for SUSE Linux Enterprise
Mozilla Thunderbird
firefox-esr (Alpine package)
firefox (Ubuntu package)
firefox-esr (Debian package)
thunderbird (Ubuntu package)
thunderbird (Debian package)

How to mitigate CVE-2019-9795

Install updates from vendor's website.

Mozilla Firefox - update to 66.0
Mozilla Thunderbird - update to 60.6.0
Firefox ESR - update to 60.6.0
firefox-esr (Alpine package) - update to 60.6.1-r0
firefox (Ubuntu package) - addressed in versions 66.0+build3-0ubuntu0.16.04.2, 66.0+build3-0ubuntu0.18.04.1, 66.0+build3-0ubuntu0.18.10.1, 66.0.1+build1-0ubuntu0.14.04.1, 66.0.2+build1-0ubuntu0.14.04.1, 66.0.2+build1-0ubuntu0.16.04.1, 66.0.2+build1-0ubuntu0.18.04.1, 66.0.2+build1-0ubuntu0.18.10.1, 66.0.3+build1-0ubuntu0.14.04.1, 66.0.3+build1-0ubuntu0.16.04.1, 66.0.3+build1-0ubuntu0.18.04.1, 66.0.3+build1-0ubuntu0.18.10.1
firefox-esr (Debian package) - update to 60.6.0esr-1~deb9u1
thunderbird (Ubuntu package) - addressed in versions 1:60.6.1+build2-0ubuntu0.14.04.1, 1:60.6.1+build2-0ubuntu0.16.04.1, 1:60.6.1+build2-0ubuntu0.18.04.1, 1:60.6.1+build2-0ubuntu0.18.10.1
thunderbird (Debian package) - update to 1:60.6.1-1~deb9u1

External References

Related Security Bulletins