Code Injection in Firefox ESR and Mozilla Firefox - CVE-2020-6798

Vulnerability identifier: #VU25122

CSH Severity: Medium

CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-6798

CWE-ID: CWE-94

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to improper input validation when parsing template tag. A remote attacker can confuse the JavaScript parser into executing an arbitrary JavaScript send a specially crafted request 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
Gentoo Linux
Arch Linux
CentOS
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for x86_64
Slackware Linux
Opensuse
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
firefox (Ubuntu package)
thunderbird (Debian package)
firefox-esr (Alpine package)
thunderbird (Ubuntu package)
firefox-esr (Debian package)
thunderbird (Alpine package)
Mozilla Thunderbird

Install updates from vendor's website.

Firefox ESR - update to 68.5.0
Mozilla Firefox - update to 73.0
firefox (Ubuntu package) - addressed in versions 73.0+build3-0ubuntu0.18.04.1, 73.0+build3-0ubuntu0.19.10.1, 73.0.1+build1-0ubuntu0.16.04.1
thunderbird (Debian package) - addressed in versions 1:68.5.0-1~deb9u1, 1:68.5.0-1~deb10u1
Mozilla Thunderbird - update to 68.5.0
firefox-esr (Alpine package) - update to 68.5.0-r0
thunderbird (Ubuntu package) - update to 1:68.7.0+build1-0ubuntu0.16.04.2
firefox-esr (Debian package) - addressed in versions 68.5.0esr-1, 68.5.0esr-1~deb8u1, 68.5.0esr-1~deb9u1, 68.5.0esr-1~deb10u1
thunderbird (Alpine package) - update to 68.5.0-r0

• https://www.mozilla.org/en-US/security/advisories/mfsa2020-05/
• https://www.mozilla.org/en-US/security/advisories/mfsa2020-06/

• Multiple vulnerabilities in Mozilla Firefox and Firefox ESR
• Multiple vulnerabilities in Mozilla Thunderbird
• Arch Linux update for firefox
• Slackware Linux update for mozilla-thunderbird
• Slackware Linux update for mozilla-firefox
• Arch Linux update for thunderbird
• Debian update for firefox-esr
• Ubuntu update for Firefox
• Debian update for thunderbird
• Red Hat update for firefox
• Red Hat update for firefox
• OpenSUSE Linux update for MozillaFirefox
• OpenSUSE Linux update for MozillaThunderbird
• Red Hat update for firefox
• Red Hat update for firefox
• Red Hat update for thunderbird
• Red Hat update for thunderbird
• Red Hat update for thunderbird
• Red Hat update for thunderbird
• Ubuntu 16.04 LTS update for Firefox
• Gentoo update for Mozilla Firefox
• Gentoo update for Mozilla Thunderbird
• CentOS 7 update for thunderbird
• CentOS 6 update for thunderbird
• CentOS 7 update for firefox
• CentOS 6 update for firefox
• Ubuntu update for Thunderbird
• Code Injection in thunderbird (Alpine package)
• Code Injection in firefox-esr (Alpine package)