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
Status
| Package | Release | Status |
|---|---|---|
|
node-matrix-js-sdk Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| focal |
Needs triage
|
|
| jammy |
Needs triage
|
|
| kinetic |
Needs triage
|
|
| lunar |
Needs triage
|
|
| trusty |
Ignored
(out of standard support)
|
|
| upstream |
Needs triage
|
|
| xenial |
Ignored
(out of standard support)
|
|
|
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)
|
|
| lunar |
Not vulnerable
(1:102.6.0+build1-0ubuntu1)
|
|
| trusty |
Does not exist
|
|
| upstream |
Needs triage
|
|
| xenial |
Needed
|
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 |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-39251
- https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-r48r-j8fx-mq2c
- https://github.com/matrix-org/matrix-js-sdk/commit/a587d7c36026fe1fcf93dfff63588abee359be76
- https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients
- https://github.com/matrix-org/matrix-js-sdk/releases/tag/v19.7.0
- https://ubuntu.com/security/notices/USN-5724-1
- NVD
- Launchpad
- Debian