Show plain JSON{"containers": {"cna": {"affected": [{"product": "matrix-ios-sdk", "vendor": "matrix-org", "versions": [{"status": "affected", "version": "< 0.23.19"}]}], "descriptions": [{"lang": "en", "value": "Matrix iOS SDK allows developers to build iOS apps compatible with Matrix. Prior to version 0.23.19, 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. matrix-ios-sdk version 0.23.19 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. To avoid malicious backup attacks, one should not verify one's new logins using emoji/QR verifications methods until patched."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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": "2022-09-28T20:35:10.000Z", "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients"}, {"tags": ["x_refsource_CONFIRM"], "url": "https://github.com/matrix-org/matrix-ios-sdk/security/advisories/GHSA-hw6g-j8v6-9hcm"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/matrix-org/matrix-ios-sdk/commit/5ca86c328a5faaab429c240551cb9ca8f0f6262c"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/matrix-org/matrix-ios-sdk/releases/tag/v0.23.19"}], "source": {"advisory": "GHSA-hw6g-j8v6-9hcm", "discovery": "UNKNOWN"}, "title": "Matrix iOS SDK vulnerable ton Olm/Megolm protocol confusion", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security-advisories@github.com", "ID": "CVE-2022-39255", "STATE": "PUBLIC", "TITLE": "Matrix iOS SDK vulnerable ton Olm/Megolm protocol confusion"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "matrix-ios-sdk", "version": {"version_data": [{"version_value": "< 0.23.19"}]}}]}, "vendor_name": "matrix-org"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "Matrix iOS SDK allows developers to build iOS apps compatible with Matrix. Prior to version 0.23.19, 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. matrix-ios-sdk version 0.23.19 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. To avoid malicious backup attacks, one should not verify one's new logins using emoji/QR verifications methods until patched."}]}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients", "refsource": "MISC", "url": "https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients"}, {"name": "https://github.com/matrix-org/matrix-ios-sdk/security/advisories/GHSA-hw6g-j8v6-9hcm", "refsource": "CONFIRM", "url": "https://github.com/matrix-org/matrix-ios-sdk/security/advisories/GHSA-hw6g-j8v6-9hcm"}, {"name": "https://github.com/matrix-org/matrix-ios-sdk/commit/5ca86c328a5faaab429c240551cb9ca8f0f6262c", "refsource": "MISC", "url": "https://github.com/matrix-org/matrix-ios-sdk/commit/5ca86c328a5faaab429c240551cb9ca8f0f6262c"}, {"name": "https://github.com/matrix-org/matrix-ios-sdk/releases/tag/v0.23.19", "refsource": "MISC", "url": "https://github.com/matrix-org/matrix-ios-sdk/releases/tag/v0.23.19"}]}, "source": {"advisory": "GHSA-hw6g-j8v6-9hcm", "discovery": "UNKNOWN"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T12:00:43.331Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients"}, {"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://github.com/matrix-org/matrix-ios-sdk/security/advisories/GHSA-hw6g-j8v6-9hcm"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/matrix-org/matrix-ios-sdk/commit/5ca86c328a5faaab429c240551cb9ca8f0f6262c"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/matrix-org/matrix-ios-sdk/releases/tag/v0.23.19"}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2025-04-23T15:50:43.338509Z", "id": "CVE-2022-39255", "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": "2025-04-23T16:54:34.263Z"}}]}, "cveMetadata": {"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2022-39255", "datePublished": "2022-09-28T20:35:10.000Z", "dateReserved": "2022-09-02T00:00:00.000Z", "dateUpdated": "2025-04-23T16:54:34.263Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}