Buffer overflow in Firefox ESR and Mozilla Firefox - CVE-2020-6814

Vulnerability identifier: #VU25859

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-2020-6814

CWE-ID: CWE-119

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to a boundary error when processing HTML content. A remote attacker can create a specially crafted website, trick the victim into opening it, trigger memory corruption 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
Gentoo Linux
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 Power, big endian
Red Hat Enterprise Linux for Scientific Computing
CentOS
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Oracle Solaris
Slackware Linux
Opensuse
openEuler
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
firefox (Ubuntu package)
thunderbird (Debian package)
firefox-esr (Debian package)
thunderbird (Ubuntu package)
thunderbird (Red Hat package)
firefox-esr (Alpine package)
mozjs68 (Alpine package)
thunderbird (Alpine package)
firefox (Alpine package)
firefox-debugsource
firefox-debuginfo
firefox
Mozilla Thunderbird
Cloud App Management V2018

Install updates from vendor's website.

Firefox ESR - update to 68.6.0
Mozilla Firefox - update to 74.0
firefox (Ubuntu package) - addressed in versions 74.0+build3-0ubuntu0.16.04.1, 74.0+build3-0ubuntu0.18.04.1, 74.0+build3-0ubuntu0.19.10.1
thunderbird (Debian package) - addressed in versions 1:68.6.0-1~deb9u1, 1:68.6.0-1~deb10u1
Mozilla Thunderbird - update to 68.6.0
firefox-esr (Debian package) - addressed in versions 68.6.0esr-1~deb9u1, 68.6.0esr-1~deb10u1
thunderbird (Ubuntu package) - update to 1:68.7.0+build1-0ubuntu0.16.04.2
thunderbird (Red Hat package) - addressed in versions 68.6.0-1.el6_10, 68.6.0-1.el7_7, 68.6.0-1.el8_0, 68.6.0-1.el8_1
firefox-esr (Alpine package) - update to 68.6.0-r0
mozjs68 (Alpine package) - update to 68.6.0-r0
thunderbird (Alpine package) - update to 68.7.0-r0
firefox (Alpine package) - update to 74.0-r0
Cloud App Management V2018 - update to 2020.1.0
firefox-debugsource - update to 62.0.3-5
firefox-debuginfo - update to 62.0.3-5
firefox - update to 62.0.3-5

• https://www.mozilla.org/en-US/security/advisories/mfsa2020-08/
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1592078%2C1604847%2C1608256%2C1612636%2C1614339
• https://www.mozilla.org/en-US/security/advisories/mfsa2020-09/

• Multiple vulnerabilities in Mozilla Firefox and Firefox ESR
• Slackware Linux update for mozilla-firefox
• Arch Linux update for firefox
• Ubuntu update for Firefox
• Debian update for firefox-esr
• Gentoo update for Mozilla Firefox
• Multiple vulnerabilities in Mozilla Thunderbird
• Slackware Linux update for mozilla-thunderbird
• Gentoo update for Mozilla Thunderbird
• OpenSUSE Linux update for MozillaFirefox
• Arch Linux update for thunderbird
• Red Hat Enterprise Linux 8 update for firefox
• Red Hat Enterprise Linux Server 8 update for firefox
• Red Hat Enterprise Linux 6 update for firefox
• Red Hat Enterprise Linux 7 update for firefox
• Debian update for thunderbird
• OpenSUSE Linux update for MozillaThunderbird
• Red Hat Enterprise Linux 6 update for thunderbird
• Red Hat Enterprise Linux 8 update for thunderbird
• Red Hat Enterprise Linux 8 update for thunderbird
• CentOS 6 update for firefox
• CentOS 6 update for thunderbird
• CentOS 7 update for firefox
• CentOS 7 update for thunderbird
• Ubuntu update for Thunderbird
• Oracle Solaris update for third party packages
• Buffer overflow in thunderbird (Alpine package)
• Buffer overflow in firefox (Alpine package)
• Buffer overflow in firefox-esr (Alpine package)
• Buffer overflow in mozjs68 (Alpine package)
• Multiple vulnerabilities in IBM Cloud App Management
• Red Hat Enterprise Linux 7 update for thunderbird
• openEuler 20.03 LTS update for firefox-62.0.3-5