Input validation error in Mozilla Thunderbird - CVE-2021-23993

Vulnerability identifier: #VU52003

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-2021-23993

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to disable sending of encrypted messages.

The vulnerability exists due to insufficient validation of imported OpenPGP keys. A remote attacker can force the victim to import a specially crafted OpenPGO key with a subkey that has an invalid self signature and prevent users from sending encrypted messages to a 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