Improper Certificate Validation in Firefox ESR and Mozilla Firefox - CVE-2020-12421

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Main Vulnerability Database Vulnerabilities #VU29457

Improper Certificate Validation in Firefox ESR and Mozilla Firefox - CVE-2020-12421

Published: July 2, 2020 / Updated: July 31, 2020


Vulnerability identifier: #VU29457
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-12421
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to disable installed Add-Ons.

The vulnerability exists due to Add-On updates do not respect the same certificate trust rules as software updates. When performing add-on updates, certificate chains terminating in non-built-in-roots were rejected (even if they were legitimately added by an administrator.) This could have caused add-ons to become out-of-date silently without notification to the user.


Affected software

Firefox ESR
Mozilla Firefox
Gentoo Linux
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Scientific Computing
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 Power, little endian
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Opensuse
Ubuntu
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
thunderbird (Debian package)
firefox-esr (Debian package)
firefox (Alpine package)
firefox-esr (Alpine package)
firefox (Red Hat package)
thunderbird (Red Hat package)
thunderbird (Alpine package)
mozjs68 (Alpine package)
thunderbird (Ubuntu package)
firefox (Ubuntu package)
Mozilla Thunderbird

How to mitigate CVE-2020-12421

Install updates from vendor's website.

Firefox ESR - update to 68.10.0
Mozilla Firefox - update to 78.0.1
thunderbird (Debian package) - addressed in versions 1:68.10.0-1~deb9u1, 1:68.10.0-1~deb10u1
firefox-esr (Debian package) - addressed in versions 68.10.0esr-1~deb9u1, 68.10.0esr-1~deb10u1
Mozilla Thunderbird - addressed in versions 68.10.0, 78.0
firefox (Alpine package) - update to 78.0.1-r0
firefox-esr (Alpine package) - update to 68.10.0-r0
firefox (Red Hat package) - addressed in versions 68.10.0-1.el6_10, 68.10.0-1.el7_8, 68.10.0-1.el8_0, 68.10.0-1.el8_1, 68.10.0-1.el8_2
thunderbird (Red Hat package) - addressed in versions 68.10.0-1.el6_10, 68.10.0-1.el7_8, 68.10.0-1.el8_0, 68.10.0-1.el8_1, 68.10.0-1.el8_2
thunderbird (Alpine package) - update to 68.10.0-r0
mozjs68 (Alpine package) - update to 68.10.0-r0
thunderbird (Ubuntu package) - addressed in versions 1:68.10.0+build1-0ubuntu0.16.04.1, 1:68.10.0+build1-0ubuntu0.18.04.1, 1:68.10.0+build1-0ubuntu0.19.10.1, 1:68.10.0+build1-0ubuntu0.20.04.1
firefox (Ubuntu package) - addressed in versions 78.0.1+build1-0ubuntu0.16.04.1, 78.0.1+build1-0ubuntu0.18.04.1, 78.0.1+build1-0ubuntu0.19.10.1, 78.0.1+build1-0ubuntu0.20.04.1

External References

Related Security Bulletins