CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
AI Score
Confidence
High
EPSS
Percentile
47.4%
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 appearing to have come from another person. Such messages will be marked with a grey shield on some platforms, but this may be missing in others. This attack is possible due to the matrix-js-sdk implementing a too permissive key forwarding strategy on the receiving end. Starting with version 19.7.0, the default policy for accepting key forwards has been made more strict in the matrix-js-sdk. matrix-js-sdk will now only accept forwarded keys in response to previously issued requests and only from own, verified devices. The SDK now sets a trusted
flag on the decrypted message upon decryption, based on whether the key used to decrypt the message was received from a trusted source. Clients need to ensure that messages decrypted with a key with trusted = false
are decorated appropriately, for example, by showing a warning for such messages. This attack requires coordination between a malicious homeserver and an attacker, and those who trust your homeservers do not need a workaround.
Vendor | Product | Version | CPE |
---|---|---|---|
matrix | javascript_sdk | * | cpe:2.3:a:matrix:javascript_sdk:*:*:*:*:*:node.js:*:* |
[
{
"vendor": "matrix-org",
"product": "matrix-js-sdk",
"versions": [
{
"version": "< 19.7.0",
"status": "affected"
}
]
}
]
github.com/matrix-org/matrix-js-sdk/commit/a587d7c36026fe1fcf93dfff63588abee359be76
github.com/matrix-org/matrix-js-sdk/releases/tag/v19.7.0
github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-6263-x97c-c4gg
github.com/matrix-org/matrix-spec-proposals/pull/3061
matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients
security.gentoo.org/glsa/202210-35
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