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MFSA2022-43 Thunderbird: Security Vulnerabilities fixed in Thunderbird 102.3.1 (CVE-2022-39251)

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MFSA2022-43 Thunderbird: Security Vulnerabilities fixed in Thunderbird 102.3.1 (CVE-2022-39251)

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
09/28/2022
Created
10/03/2022
Added
10/03/2022
Modified
10/03/2022

Description

Matrix Javascript SDK is the Matrix Client-Server SDK for JavaScript. Prior to version 19.7.0, an attacker cooperating with a malicious homeserver can construct messages that legitimately appear to have come from another person, without any indication such as a grey shield. Additionally, a sophisticated attacker cooperating with a malicious homeserver could employ this vulnerability to perform a targeted attack in order to send fake to-device messages appearing to originate from another user. This can allow, for example, to inject the key backup secret during a self-verification, to make a targeted device start using a malicious key backup spoofed by the homeserver. These attacks are possible due to a protocol confusion vulnerability that accepts to-device messages encrypted with Megolm instead of Olm. Starting with version 19.7.0, matrix-js-sdk has been modified to only accept Olm-encrypted to-device messages. Out of caution, several other checks have been audited or added. This attack requires coordination between a malicious home server and an attacker, so those who trust their home servers do not need a workaround.

Solution(s)

  • mozilla-thunderbird-upgrade-102_3_1

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