Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Matrix | Javascript Sdk | < 19.7.0 |
Related Weaknesses (CWE)
References
- https://github.com/matrix-org/matrix-js-sdk/commit/a587d7c36026fe1fcf93dfff63588PatchThird Party Advisory
- https://github.com/matrix-org/matrix-js-sdk/releases/tag/v19.7.0Release NotesThird Party Advisory
- https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-r48r-j8fx-mThird Party Advisory
- https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-maVendor Advisory
- https://security.gentoo.org/glsa/202210-35Third Party Advisory
- https://github.com/matrix-org/matrix-js-sdk/commit/a587d7c36026fe1fcf93dfff63588PatchThird Party Advisory
- https://github.com/matrix-org/matrix-js-sdk/releases/tag/v19.7.0Release NotesThird Party Advisory
- https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-r48r-j8fx-mThird Party Advisory
- https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-maVendor Advisory
- https://security.gentoo.org/glsa/202210-35Third Party Advisory
FAQ
What is CVE-2022-39251?
CVE-2022-39251 is a vulnerability with a CVSS score of 8.6 (HIGH). 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 ha...
How severe is CVE-2022-39251?
CVE-2022-39251 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-39251?
Check the references section above for vendor advisories and patch information. Affected products include: Matrix Javascript Sdk.