Out-of-bounds read in Mozilla Firefox - CVE-2020-6821

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Main Vulnerability Database Vulnerabilities #VU26649

Out-of-bounds read in Mozilla Firefox - CVE-2020-6821

Published: April 7, 2020


Vulnerability identifier: #VU26649
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-6821
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition when using WebGL copyTexSubImage method. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger out-of-bounds read error and read contents of uninitialized memory on the system.


Affected software

Mozilla Firefox
Firefox ESR
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 Power, big endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_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
Slackware Linux
Opensuse
Ubuntu
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
thunderbird (Red Hat package)
firefox (Red Hat package)
firefox (Alpine package)
firefox-esr (Alpine package)
mozjs68 (Alpine package)
thunderbird (Alpine package)
firefox (Ubuntu package)
firefox-esr (Debian package)
thunderbird (Debian package)
thunderbird (Ubuntu package)
Mozilla Thunderbird

How to mitigate CVE-2020-6821

Install updates from vendor's website.

Mozilla Firefox - update to 75.0
thunderbird (Red Hat package) - addressed in versions 68.7.0-1.el6_10, 68.7.0-1.el7_8, 68.7.0-1.el8_0, 68.7.0-1.el8_1
firefox (Red Hat package) - addressed in versions 68.7.0-2.el6_10, 68.7.0-2.el7_8, 68.7.0-2.el8_0, 68.7.0-2.el8_1
Firefox ESR - update to 68.7.0
Mozilla Thunderbird - update to 68.7.0
firefox (Alpine package) - update to 75.0-r0
firefox-esr (Alpine package) - update to 68.7.0-r0
mozjs68 (Alpine package) - update to 68.7.0-r0
thunderbird (Alpine package) - update to 68.8.0-r0
firefox (Ubuntu package) - addressed in versions 75.0+build3-0ubuntu0.16.04.1, 75.0+build3-0ubuntu0.18.04.1, 75.0+build3-0ubuntu0.19.10.1
firefox-esr (Debian package) - addressed in versions 68.7.0esr-1~deb9u1, 68.7.0esr-1~deb10u1
thunderbird (Debian package) - addressed in versions 1:68.7.0-1~deb9u1, 1:68.7.0-1~deb10u1
thunderbird (Ubuntu package) - addressed in versions 1:68.7.0+build1-0ubuntu0.16.04.2, 1:68.7.0+build1-0ubuntu0.18.04.1, 1:68.7.0+build1-0ubuntu0.19.10.1

External References

Related Security Bulletins