Out-of-bounds write in Firefox ESR and Mozilla Firefox - CVE-2020-6796

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Main Vulnerability Database Vulnerabilities #VU25120

Out-of-bounds write in Firefox ESR and Mozilla Firefox - CVE-2020-6796

Published: February 11, 2020 / Updated: February 11, 2020


Vulnerability identifier: #VU25120
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-2020-6796
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability exists due to a boundary error when reading shared memory in the parent process. 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.


Affected software

Firefox ESR
Mozilla Firefox
Arch Linux
Gentoo Linux
CentOS
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 Scientific Computing
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)
firefox-esr (Alpine package)
firefox-esr (Debian package)

How to mitigate CVE-2020-6796

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
firefox-esr (Alpine package) - update to 68.5.0-r0
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

External References

Related Security Bulletins