#VU59081 Insufficient UI Warning of Dangerous Operations in Mozilla Thunderbird - CVE-2021-4126
Published: December 21, 2021
Vulnerability identifier: #VU59081
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-4126
CWE-ID: CWE-357
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Mozilla Thunderbird
Mozilla Thunderbird
Software vendor:
Mozilla
Mozilla
Description
The vulnerability allows a remote attacker to perform spoofing attacks.
The vulnerability exists in the way Thunderbird handles signed email messages. When receiving an OpenPGP/MIME signed email message that contains an additional outer MIME message layer, for example a message footer added by a mailing list gateway, Thunderbird only considered the inner signed message for the signature validity. This gave the false impression that the additional contents were also covered by the digital signature.
Remediation
Install updates from vendor's website.