Heap-based buffer overflow in Firefox ESR and Mozilla Firefox - CVE-2020-26971

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Main Vulnerability Database Vulnerabilities #VU49013

Heap-based buffer overflow in Firefox ESR and Mozilla Firefox - CVE-2020-26971

Published: December 15, 2020


Vulnerability identifier: #VU49013
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-2020-26971
CWE-ID: CWE-122
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 within WebGL component. A remote attacker can create a specially crafted web page, trick the victim into visiting it, trigger heap-based buffer overflow 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
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
CentOS
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
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 ARM 64 - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Ubuntu
openEuler
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
firefox-esr (Debian package)
thunderbird (Debian package)
firefox (Red Hat package)
thunderbird (Red Hat package)
firefox-esr (Alpine package)
thunderbird (Alpine package)
firefox (Alpine package)
thunderbird (Ubuntu package)
firefox
firefox-debugsource
firefox-debuginfo
mozilla-crashreporter-firefox-debuginfo
firefox (Ubuntu package)
Mozilla Thunderbird

How to mitigate CVE-2020-26971

Install updates from vendor's website.

Firefox ESR - update to 78.6.0
Mozilla Firefox - update to 84.0
Mozilla Thunderbird - update to 78.6.0
firefox-esr (Debian package) - update to 78.6.0esr-1~deb10u1
thunderbird (Debian package) - update to 78.6.0-1~deb10u1
firefox (Red Hat package) - addressed in versions 78.6.0-1.el7_9, 78.6.0-1.el8_0, 78.6.0-1.el8_1, 78.6.0-1.el8_2, 78.6.0-1.el8_3
thunderbird (Red Hat package) - addressed in versions 78.6.0-1.el7_9, 78.6.0-1.el8_0, 78.6.0-1.el8_1, 78.6.0-1.el8_2, 78.6.0-1.el8_3
firefox-esr (Alpine package) - update to 78.6.0-r0
thunderbird (Alpine package) - update to 78.6.1-r0
firefox (Alpine package) - update to 84.0.1-r0
thunderbird (Ubuntu package) - update to 1:78.6.1+build1-0ubuntu0.20.10.1
firefox - addressed in versions 79.0-20, 79.0-21
firefox-debugsource - addressed in versions 79.0-20, 79.0-21
firefox-debuginfo - addressed in versions 79.0-20, 79.0-21
mozilla-crashreporter-firefox-debuginfo - addressed in versions 79.0-20, 79.0-21
firefox (Ubuntu package) - addressed in versions 84.0+build3-0ubuntu0.16.04.1, 84.0+build3-0ubuntu0.18.04.1, 84.0+build3-0ubuntu0.20.04.1, 84.0+build3-0ubuntu0.20.10.1

External References

Related Security Bulletins