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                                CERT-Renater

                      Note d'Information No. 2021/VULN671
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DATE                : 21/12/2021

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Thunderbird versions prior to
                                        91.4.1.

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https://www.mozilla.org/en-US/security/advisories/mfsa2021-55/
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Mozilla Foundation Security Advisory 2021-55

Security Vulnerabilities fixed in Thunderbird 91.4.1


Announced: December 21, 2021
Impact:    moderate
Products:  Thunderbird
Fixed in:  Thunderbird 91.4.1

# CVE-2021-4126: OpenPGP signature status doesn't consider additional 
message content

Reporter: Kai Engert
Impact:   moderate


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.


References

   o Bug 1732310

# CVE-2021-44538: Matrix chat library libolm bundled with Thunderbird
vulnerable to a buffer overflow

Reporter: brevilo
Impact:   moderate


Description

Thunderbird users who use the Matrix chat protocol were vulnerable to a
buffer overflow in libolm, that an attacker may trigger by a crafted
sequence of messages. The overflow content is partially controllable by
the attacker and limited to ASCII spaces and digits.


References

   o Bug 1744056


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