Vulnerability identifier: #VU59081
Vulnerability risk: Low
Exploitation vector: Network
Exploit availability: No
Client/Desktop applications / Messaging software
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.
Install updates from vendor's website.
Vulnerable software versions
Mozilla Thunderbird: 91.0 - 91.4.0
Can this vulnerability be exploited remotely?
Is there known malware, which exploits this vulnerability?