Security features bypass in Mozilla Thunderbird - CVE-2021-43528

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Main Vulnerability Database Vulnerabilities #VU58618

Security features bypass in Mozilla Thunderbird - CVE-2021-43528

Published: December 7, 2021


Vulnerability identifier: #VU58618
CSH Severity: Low
CVSS v4: 1.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-43528
CWE-ID: CWE-254
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to Thunderbird unexpectedly enabled JavaScript in the composition area. The JavaScript execution context was limited to this area and did not receive chrome-level privileges, but could be used as a stepping stone to further an attack with other vulnerabilities.


Affected software

Mozilla Thunderbird
Gentoo Linux
Arch Linux
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Anolis OS
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server - AUS
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
Oracle Solaris
SUSE Linux Enterprise Workstation Extension
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 (Red Hat package)
thunderbird
MozillaThunderbird
MozillaThunderbird-debuginfo
MozillaThunderbird-debugsource
MozillaThunderbird-translations-common
MozillaThunderbird-translations-other
thunderbird (Debian package)
thunderbird (Ubuntu package)
mail-client/thunderbird
mail-client/thunderbird-bin

How to mitigate CVE-2021-43528

Install updates from vendor's website.

Mozilla Thunderbird - update to 91.4.0
thunderbird (Red Hat package) - addressed in versions 91.4.0-2.el8_1, 91.4.0-2.el8_2, 91.4.0-2.el8_4, 91.4.0-2.el8_5, 91.4.0-3.el7_9
thunderbird - update to 91.4.0-2.0.1
MozillaThunderbird - update to 91.4.0-8.45.2
MozillaThunderbird-debuginfo - update to 91.4.0-8.45.2
MozillaThunderbird-debugsource - update to 91.4.0-8.45.2
MozillaThunderbird-translations-common - update to 91.4.0-8.45.2
MozillaThunderbird-translations-other - update to 91.4.0-8.45.2
thunderbird (Debian package) - addressed in versions 1:91.4.1-1~deb10u1, 1:91.4.1-1~deb11u1
thunderbird (Ubuntu package) - addressed in versions 1:91.5.0+build1-0ubuntu0.18.04.1, 1:91.5.0+build1-0ubuntu0.20.04.1, 1:91.5.0+build1-0ubuntu0.21.10.1
mail-client/thunderbird - update to 91.12.0
mail-client/thunderbird-bin - update to 91.12.0

External References

Related Security Bulletins