Protection Mechanism Failure in Mozilla Thunderbird - CVE-2021-29957

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Main Vulnerability Database Vulnerabilities #VU53307

Protection Mechanism Failure in Mozilla Thunderbird - CVE-2021-29957

Published: May 17, 2021 / Updated: June 7, 2021


Vulnerability identifier: #VU53307
CSH Severity: Low
CVSS v4: 2.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-29957
CWE-ID: CWE-693
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 insufficient implementation of security measures. If a MIME encoded email contains an OpenPGP inline signed or encrypted message part, but also contains an additional unprotected part, Thunderbird did not indicate that only parts of the message are protected.


Affected software

Mozilla Thunderbird
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 ARM 64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux Server - AUS
SUSE Linux Enterprise Workstation Extension
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 (Debian package)
thunderbird (Red Hat package)
MozillaThunderbird
MozillaThunderbird-debuginfo
MozillaThunderbird-debugsource
MozillaThunderbird-translations-common
MozillaThunderbird-translations-other
thunderbird

How to mitigate CVE-2021-29957

Install updates from vendor's website.

Mozilla Thunderbird - update to 78.10.2
thunderbird (Debian package) - update to 78.11.0-1~deb10u1
thunderbird (Red Hat package) - addressed in versions 78.11.0-1.el7_9, 78.11.0-1.el8_1, 78.11.0-1.el8_2, 78.11.0-1.el8_4
MozillaThunderbird - update to 78.10.2-8.27.1
MozillaThunderbird-debuginfo - update to 78.10.2-8.27.1
MozillaThunderbird-debugsource - update to 78.10.2-8.27.1
MozillaThunderbird-translations-common - update to 78.10.2-8.27.1
MozillaThunderbird-translations-other - update to 78.10.2-8.27.1
thunderbird - update to 78.11.0-1.0.1

External References

Related Security Bulletins