Rapid7 Vulnerability & Exploit Database

MFSA2021-55 Thunderbird: Security Vulnerabilities fixed in Thunderbird 91.4.1 (CVE-2021-4126)

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MFSA2021-55 Thunderbird: Security Vulnerabilities fixed in Thunderbird 91.4.1 (CVE-2021-4126)

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
12/21/2021
Created
12/22/2021
Added
12/21/2021
Modified
01/06/2023

Description

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. Starting with Thunderbird version 91.4.1, only the signature that belongs to the top level MIME part will be considered for the displayed status. This vulnerability affects Thunderbird < 91.4.1.

Solution(s)

  • mozilla-thunderbird-upgrade-91_4_1

References

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