Memory corruption in Mozilla Firefox and Firefox ESR - CVE-2019-9793

Vulnerability identifier: #VU18032

CSH Severity: High

CVSS v4: 7.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-9793

CWE-ID: CWE-119

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 missing boundary checks for strings, arrays or typed arrays when the default Spectre mitigations have been disabled. A remote attacker can trick the victim to visit a specially crafted web page, trigger memory corruption 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 but requires the user to specifically disable Spectre mitigations.

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

Install updates from vendor's website.

Mozilla Firefox - update to 66.0
Firefox ESR - update to 60.6.0
firefox (Ubuntu package) - addressed in versions 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
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
Mozilla Thunderbird - update to 60.6.0
firefox-esr (Debian package) - update to 60.6.0esr-1~deb9u1
thunderbird (Debian package) - update to 1:60.6.1-1~deb9u1
firefox-esr (Alpine package) - update to 60.6.1-r0

• https://www.mozilla.org/en-US/security/advisories/mfsa2019-07/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1528829

• Multiple vulnerabilities in Mozilla Firefox
• Multiple vulnerabilities in Mozilla Firefox ESR
• Debian update for firefox-esr
• Multiple vulnerabilities in Mozilla Thunderbird
• Ubuntu update for Firefox
• Ubuntu update for Thunderbird
• Ubuntu regression update for Firefox
• Debian update for thunderbird
• Ubuntu regression update for Firefox
• Arch Linux update for firefox
• OpenSUSE Linux update for MozillaThunderbird
• OpenSUSE Linux update for MozillaFirefox
• OpenSUSE Linux update for MozillaFirefox
• OpenSUSE Linux update for MozillaThunderbird
• 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
• Memory corruption in firefox-esr (Alpine package)