{"containers":{"cna":{"affected":[{"product":"matrix-android-sdk2","vendor":"matrix-org","versions":[{"status":"affected","version":"< 1.5.1"}]}],"descriptions":[{"lang":"en","value":"matrix-android-sdk2 is the Matrix SDK for Android. Prior to version 1.5.1, 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 key forwarding strategy implemented in the matrix-android-sdk2 that is too permissive. Starting with version 1.5.1, the default policy for accepting key forwards has been made more strict in the matrix-android-sdk2. The matrix-android-sdk2 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). As a workaroubnd, current users of the SDK can disable key forwarding in their forks using `CryptoService#enableKeyGossiping(enable: Boolean)`."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-322","description":"CWE-322: Key Exchange without Entity Authentication","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2022-09-28T20:00:19.000Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M"},"references":[{"tags":["x_refsource_MISC"],"url":"https://github.com/matrix-org/matrix-spec-proposals/pull/3061"},{"tags":["x_refsource_CONFIRM"],"url":"https://github.com/matrix-org/matrix-android-sdk2/security/advisories/GHSA-2pvj-p485-cp3m"},{"tags":["x_refsource_MISC"],"url":"https://github.com/matrix-org/matrix-android-sdk2/commit/77df720a238d17308deab83ecaa37f7a4740a17e"},{"tags":["x_refsource_MISC"],"url":"https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.5.1"}],"source":{"advisory":"GHSA-2pvj-p485-cp3m","discovery":"UNKNOWN"},"title":"matrix-android-sdk2 vulnerable to impersonation via forwarded Megolm sessions","x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"security-advisories@github.com","ID":"CVE-2022-39246","STATE":"PUBLIC","TITLE":"matrix-android-sdk2 vulnerable to impersonation via forwarded Megolm sessions"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"matrix-android-sdk2","version":{"version_data":[{"version_value":"< 1.5.1"}]}}]},"vendor_name":"matrix-org"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"matrix-android-sdk2 is the Matrix SDK for Android. Prior to version 1.5.1, 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 key forwarding strategy implemented in the matrix-android-sdk2 that is too permissive. Starting with version 1.5.1, the default policy for accepting key forwards has been made more strict in the matrix-android-sdk2. The matrix-android-sdk2 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). As a workaroubnd, current users of the SDK can disable key forwarding in their forks using `CryptoService#enableKeyGossiping(enable: Boolean)`."}]},"impact":{"cvss":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-322: Key Exchange without Entity Authentication"}]},{"description":[{"lang":"eng","value":"CWE-287: Improper Authentication"}]}]},"references":{"reference_data":[{"name":"https://github.com/matrix-org/matrix-spec-proposals/pull/3061","refsource":"MISC","url":"https://github.com/matrix-org/matrix-spec-proposals/pull/3061"},{"name":"https://github.com/matrix-org/matrix-android-sdk2/security/advisories/GHSA-2pvj-p485-cp3m","refsource":"CONFIRM","url":"https://github.com/matrix-org/matrix-android-sdk2/security/advisories/GHSA-2pvj-p485-cp3m"},{"name":"https://github.com/matrix-org/matrix-android-sdk2/commit/77df720a238d17308deab83ecaa37f7a4740a17e","refsource":"MISC","url":"https://github.com/matrix-org/matrix-android-sdk2/commit/77df720a238d17308deab83ecaa37f7a4740a17e"},{"name":"https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.5.1","refsource":"MISC","url":"https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.5.1"}]},"source":{"advisory":"GHSA-2pvj-p485-cp3m","discovery":"UNKNOWN"}}},"adp":[{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-03T12:00:43.348Z"},"title":"CVE Program Container","references":[{"tags":["x_refsource_MISC","x_transferred"],"url":"https://github.com/matrix-org/matrix-spec-proposals/pull/3061"},{"tags":["x_refsource_CONFIRM","x_transferred"],"url":"https://github.com/matrix-org/matrix-android-sdk2/security/advisories/GHSA-2pvj-p485-cp3m"},{"tags":["x_refsource_MISC","x_transferred"],"url":"https://github.com/matrix-org/matrix-android-sdk2/commit/77df720a238d17308deab83ecaa37f7a4740a17e"},{"tags":["x_refsource_MISC","x_transferred"],"url":"https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.5.1"}]},{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-04-23T15:50:49.774935Z","id":"CVE-2022-39246","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":"2025-04-23T16:54:47.328Z"}}]},"cveMetadata":{"assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","assignerShortName":"GitHub_M","cveId":"CVE-2022-39246","datePublished":"2022-09-28T20:00:19.000Z","dateReserved":"2022-09-02T00:00:00.000Z","dateUpdated":"2025-04-23T16:54:47.328Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.1"}