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CVE-2022-39251

Published: 28 September 2022

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.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
node-matrix-js-sdk
Launchpad, Ubuntu, Debian
kinetic Ignored
(end of life, was needs-triage)
trusty Ignored
(end of standard support)
xenial Ignored
(end of standard support)
bionic Does not exist

focal Needs triage

jammy Needs triage

upstream Needs triage

mantic Needs triage

lunar Ignored
(end of life, was needs-triage)
thunderbird
Launchpad, Ubuntu, Debian
bionic
Released (1:102.4.2+build2-0ubuntu0.18.04.1)
focal
Released (1:102.4.2+build2-0ubuntu0.20.04.1)
jammy
Released (1:102.4.2+build2-0ubuntu0.22.04.1)
kinetic
Released (1:102.4.2+build2-0ubuntu0.22.10.1)
trusty Does not exist

upstream Needs triage

lunar Not vulnerable
(1:102.6.0+build1-0ubuntu1)
xenial Ignored
(end of standard support)
mantic Not vulnerable
(1:102.6.0+build1-0ubuntu1)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N