CVE-2022-39251

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.

Link	Resource
https://github.com/matrix-org/matrix-js-sdk/commit/a587d7c36026fe1fcf93dfff63588abee359be76	Patch Third Party Advisory
https://github.com/matrix-org/matrix-js-sdk/releases/tag/v19.7.0	Release Notes Third Party Advisory
https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients	Vendor Advisory
https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-r48r-j8fx-mq2c	Third Party Advisory
https://security.gentoo.org/glsa/202210-35	Third Party Advisory

Configuration 1

cpe:2.3:a:matrix:javascript_sdk:*:*:*:*:*:node.js:*:*

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Published : 2022-09-28 08:15

Updated : 2022-12-03 01:34

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NVD link : CVE-2022-39251

Mitre link : CVE-2022-39251

No products.

CWE-287