Wednesday, December 22, 2021

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

Description
When receiving an OpenPGP/MIME signed email message that contains anadditional outer MIME message layer, for example a message footer added by amailing list gateway, Thunderbird only considered the inner signed message forthe signature validity. This gave the false impression that the additional contentswere 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 forthe displayed status.
Solution(s)
  • mozilla-thunderbird-upgrade-91_4_1


  • References
  • https://attackerkb.com/topics/cve-2021-4126
  • CVE - 2021-4126
  • http://www.mozilla.org/security/announce/2021/mfsa2021-55.html




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