Type Confusion in Firefox ESR and Mozilla Firefox - CVE-2019-9813

Vulnerability identifier: #VU18062

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-2019-9813

CWE-ID: CWE-843

Exploitation vector: Remote access

Exploit availability: Public exploit is available

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a type confusion error when handling proto mutations in IonMonkey JIT code. A remote attacker can create a specially crafted web page, 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.

Firefox ESR
Mozilla Firefox
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
Slackware Linux
Opensuse
SUSE Package Hub for SUSE Linux Enterprise
thunderbird (Ubuntu package)
firefox (Ubuntu package)
firefox-esr (Alpine package)
firefox-esr (Debian package)
Mozilla Thunderbird

Install updates from vendor's website.

Firefox ESR - update to 60.6.1
Mozilla Firefox - update to 66.0.1
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
firefox (Ubuntu package) - addressed in versions 66.0.1+build1-0ubuntu0.14.04.1, 66.0.1+build1-0ubuntu0.16.04.1, 66.0.1+build1-0ubuntu0.18.04.1, 66.0.1+build1-0ubuntu0.18.10.1
Mozilla Thunderbird - update to 60.6.1
firefox-esr (Alpine package) - update to 60.6.1-r0
firefox-esr (Debian package) - update to 60.6.1esr-1~deb9u1

• Exploit #6131 - SpiderMonkey - IonMonkey Compiled Code Fails to Update Inferred Property Types (Type Confusion) (June 17, 2021)

• https://www.mozilla.org/en-US/security/advisories/mfsa2019-09/
• https://www.mozilla.org/en-US/security/advisories/mfsa2019-10/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1538006

• Multiple vulnerabilities in Mozilla Firefox and Firefox ESR
• Multiple vulnerabilities in Mozilla Thunderbird
• Ubuntu update for Firefox
• Ubuntu update for Thunderbird
• Arch Linux update for thunderbird
• OpenSUSE Linux update for MozillaThunderbird
• Slackware Linux update for mozilla-firefox
• OpenSUSE Linux update for MozillaFirefox
• OpenSUSE Linux update for MozillaFirefox
• OpenSUSE Linux update for MozillaThunderbird
• OpenSUSE Linux update for MozillaThunderbird
• Debian update for firefox-esr
• Red Hat update for thunderbird
• Red Hat update for thunderbird
• Red Hat update for firefox
• Red Hat update for firefox
• Red Hat update for thunderbird
• Red Hat update for firefox
• Type Confusion in firefox-esr (Alpine package)