{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"state":"PUBLISHED","cveId":"CVE-2022-39249","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","assignerShortName":"GitHub_M","dateUpdated":"2025-04-23T16:55:11.362Z","dateReserved":"2022-09-02T00:00:00.000Z","datePublished":"2022-09-28T00:00:00.000Z"},"containers":{"cna":{"title":"Matrix Javascript SDK vulnerable to impersonation via forwarded Megolm sessions","providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2022-10-31T00:00:00.000Z"},"descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"matrix-org","product":"matrix-js-sdk","versions":[{"version":"< 19.7.0","status":"affected"}]}],"references":[{"url":"https://github.com/matrix-org/matrix-js-sdk/commit/a587d7c36026fe1fcf93dfff63588abee359be76"},{"url":"https://github.com/matrix-org/matrix-js-sdk/releases/tag/v19.7.0"},{"url":"https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-6263-x97c-c4gg"},{"url":"https://github.com/matrix-org/matrix-spec-proposals/pull/3061"},{"url":"https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients"},{"name":"GLSA-202210-35","tags":["vendor-advisory"],"url":"https://security.gentoo.org/glsa/202210-35"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"type":"CWE","lang":"en","description":"CWE-322: Key Exchange without Entity Authentication","cweId":"CWE-322"}]},{"descriptions":[{"type":"CWE","lang":"en","description":"CWE-287: Improper Authentication","cweId":"CWE-287"}]}],"source":{"advisory":"GHSA-6263-x97c-c4gg","discovery":"UNKNOWN"}},"adp":[{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-03T12:00:43.417Z"},"title":"CVE Program Container","references":[{"url":"https://github.com/matrix-org/matrix-js-sdk/commit/a587d7c36026fe1fcf93dfff63588abee359be76","tags":["x_transferred"]},{"url":"https://github.com/matrix-org/matrix-js-sdk/releases/tag/v19.7.0","tags":["x_transferred"]},{"url":"https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-6263-x97c-c4gg","tags":["x_transferred"]},{"url":"https://github.com/matrix-org/matrix-spec-proposals/pull/3061","tags":["x_transferred"]},{"url":"https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients","tags":["x_transferred"]},{"name":"GLSA-202210-35","tags":["vendor-advisory","x_transferred"],"url":"https://security.gentoo.org/glsa/202210-35"}]},{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-04-23T15:51:04.050488Z","id":"CVE-2022-39249","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2025-04-23T16:55:11.362Z"}}]}}