Spoofing attack in Mozilla Thunderbird - CVE-2021-23992

Vulnerability identifier: #VU52004

CSH Severity: Medium

CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-23992

CWE-ID: CWE-451

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to incorrect processing of user-supplied data, when checking if the user ID associated with an OpenPGP key has a valid self signature. An attacker may create a crafted version of an OpenPGP key, by either replacing the original user ID, or by adding another user ID. If Thunderbird imports and accepts the crafted key, the Thunderbird user may falsely conclude that the false user ID belongs to the correspondent.

Mozilla Thunderbird
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for Power, little endian
CentOS
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for ARM 64
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
SUSE Linux Enterprise Workstation Extension
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)
MozillaThunderbird
MozillaThunderbird-debuginfo
MozillaThunderbird-debugsource
MozillaThunderbird-translations-common
MozillaThunderbird-translations-other

Install updates from vendor's website.

Mozilla Thunderbird - update to 78.9.1
thunderbird (Red Hat package) - addressed in versions 78.9.1-1.el7_9, 78.9.1-1.el8_1, 78.9.1-1.el8_2, 78.9.1-1.el8_3
MozillaThunderbird - update to 78.9.1-8.20.1
MozillaThunderbird-debuginfo - update to 78.9.1-8.20.1
MozillaThunderbird-debugsource - update to 78.9.1-8.20.1
MozillaThunderbird-translations-common - update to 78.9.1-8.20.1
MozillaThunderbird-translations-other - update to 78.9.1-8.20.1

• https://www.mozilla.org/en-US/security/advisories/mfsa2021-13/

• Multiple vulnerabilities in OpenPGP implementation in Mozilla Thunderbird
• Red Hat Enterprise Linux 7 update for thunderbird
• Red Hat Enterprise Linux 8.2 update for thunderbird
• Red Hat Enterprise Linux 8 update for thunderbird
• Red Hat Enterprise Linux 8.1 update for thunderbird
• CentOS 7 update for thunderbird
• SUSE update for MozillaThunderbird