{"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. 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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", "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. 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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:matrix:software_development_kit:*:*:*:*:*:iphone_os:*:*", "matchCriteriaId": "D8936990-DFEF-443C-B860-E38726590804", "versionEndExcluding": "0.23.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "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."}, {"lang": "es", "value": "Matrix iOS SDK permite a desarrolladores crear aplicaciones para iOS compatibles con Matrix. En versiones anteriores a 0.23.19, un atacante que coopere con un servidor dom\u00e9stico malicioso puede construir mensajes que parezcan leg\u00edtimamente proceder de otra persona, sin ninguna indicaci\u00f3n como un escudo gris. Adem\u00e1s, un atacante sofisticado que coopere con un servidor dom\u00e9stico malicioso podr\u00eda emplear esta vulnerabilidad para llevar a cabo un ataque dirigido con el fin de enviar mensajes falsos al dispositivo que parezcan proceder de otro usuario. Esto puede permitir, por ejemplo, inyectar el secreto de la copia de seguridad de la clave durante una autoverificaci\u00f3n, para hacer que un dispositivo objetivo comience a usar una copia de seguridad de la clave maliciosa falsificada por el servidor dom\u00e9stico. Estos ataques son posibles debido a una vulnerabilidad de confusi\u00f3n de protocolo que acepta mensajes to-device cifrados con Megolm en lugar de Olm. matrix-ios-sdk versi\u00f3n 0.23.19, ha sido modificada para aceptar \u00fanicamente mensajes to-device cifrados con Olm. Por precauci\u00f3n, han sido auditadas o a\u00f1adidas otras comprobaciones. Este ataque requiere la coordinaci\u00f3n entre un servidor dom\u00e9stico malicioso y un atacante, por lo que aquellos que conf\u00edan en sus servidores dom\u00e9sticos no necesitan una mitigaci\u00f3n. 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{}