Command Injection in Mozilla Thunderbird - CVE-2021-29969

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Main Vulnerability Database Vulnerabilities #VU54829

Command Injection in Mozilla Thunderbird - CVE-2021-29969

Published: July 13, 2021


Vulnerability identifier: #VU54829
CSH Severity: Medium
CVSS v4: 8.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-29969
CWE-ID: CWE-77
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary commands.

The vulnerability exists in the way Thunderbird handles IMAP server responses sent prior to STARTTLS process. A remote attacker with ability to perform MitM attack can send arbitrary IMAP commands before the STARTTLS handshake and execute them after the handshake is complete.

This could have resulted in Thunderbird showing incorrect information, for example the attacker could have tricked Thunderbird to show folders that didn't exist on the IMAP server.


Affected software

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

How to mitigate CVE-2021-29969

Install updates from vendor's website.

Mozilla Thunderbird - update to 78.12.0
thunderbird (Debian package) - update to 1:78.12.0-1~deb10u1
thunderbird (Red Hat package) - addressed in versions 78.12.0-2.el7_9, 78.12.0-2.el8_1, 78.12.0-2.el8_2, 78.12.0-3.el8_4
thunderbird - addressed in versions 78.12.0-2.0.1, 91.6.0-1.0.1
MozillaThunderbird-translations-common - update to 78.12.0-8.33.1
MozillaThunderbird-translations-other - update to 78.12.0-8.33.1
MozillaThunderbird-debugsource - update to 78.12.0-8.33.1
MozillaThunderbird-debuginfo - update to 78.12.0-8.33.1
MozillaThunderbird - update to 78.12.0-8.33.1
thunderbird (Ubuntu package) - addressed in versions 1:78.13.0+build1-0ubuntu0.18.04.1, 1:78.13.0+build1-0ubuntu0.20.04.2, 1:78.13.0+build1-0ubuntu0.21.04.2
mail-client/thunderbird - update to 91.12.0
mail-client/thunderbird-bin - update to 91.12.0

External References

Related Security Bulletins