Use-after-free in Mozilla Firefox - CVE-2019-11746

Vulnerability identifier: #VU20818

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-2019-11746

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error while manipulating video elements if the body is freed while still in use. A remote attacker can create a specially crafted website, trick the victim into visiting it, trigger use-after-free error and execute arbitrary code on the target system with privileges of the current user.

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

Mozilla Firefox
Firefox ESR
Arch Linux
Gentoo Linux
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
firefox (Ubuntu package)
thunderbird (Debian package)
thunderbird (Ubuntu package)
firefox-esr (Alpine package)
firefox-esr (Debian package)
Mozilla Thunderbird

Install updates from vendor's website.

Mozilla Firefox - update to 69.0
firefox (Ubuntu package) - addressed in versions 69.0+build2-0ubuntu0.16.04.4, 69.0+build2-0ubuntu0.18.04.1, 69.0+build2-0ubuntu0.19.04.1, 69.0.2+build1-0ubuntu0.16.04.1, 69.0.2+build1-0ubuntu0.18.04.1, 69.0.2+build1-0ubuntu0.19.04.1
thunderbird (Debian package) - addressed in versions 1:60.9.0-1~deb9u1, 1:60.9.0-1~deb10u1
thunderbird (Ubuntu package) - addressed in versions 1:60.9.0+build1-0ubuntu0.16.04.2, 1:60.9.0+build1-0ubuntu0.18.04.1, 1:60.9.0+build1-0ubuntu0.19.04.1
Mozilla Thunderbird - addressed in versions 60.9.0, 68.1.0
Firefox ESR - addressed in versions 60.9.0, 68.1.0
firefox-esr (Alpine package) - update to 60.9.0-r0
firefox-esr (Debian package) - update to 60.9.0esr-1~deb10u1

• https://www.mozilla.org/en-US/security/advisories/mfsa2019-25/

• Multiple vulnerabilities in Mozilla Firefox
• Multiple vulnerabilities in Mozilla Firefox ESR
• Multiple vulnerabilities in Mozilla Firefox ESR
• Arch Linux update for firefox
• Ubuntu update for Firefox
• Red Hat update for firefox
• Red Hat update for firefox
• Multiple vulnerabilities in Mozilla Thunderbird
• Debian update for thunderbird
• Red Hat update for thunderbird
• Red Hat update for thunderbird
• Red Hat update for thunderbird
• Red Hat update for firefox
• Debian update for firefox-esr
• Ubuntu update for Thunderbird
• Ubuntu regressions update for Firefox
• Gentoo update for Mozilla Firefox
• Use-after-free in firefox-esr (Alpine package)