{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2023-4346", "assignerOrgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6", "state": "PUBLISHED", "assignerShortName": "icscert", "dateReserved": "2023-08-14T22:14:58.101Z", "datePublished": "2023-08-29T19:38:55.399Z", "dateUpdated": "2024-08-02T07:24:04.770Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "KNX Protocol Connection Authorization Option 1", "vendor": "KNX Association", "versions": [{"status": "affected", "version": "0"}]}], "credits": [{"lang": "en", "type": "reporter", "user": "00000000-0000-4000-9000-000000000000", "value": "Felix Eberstaller"}, {"lang": "en", "type": "finder", "user": "00000000-0000-4000-9000-000000000000", "value": "Limes Security"}], "datePublic": "2023-08-24T16:00:00.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "\n\n<span style=\"background-color: rgb(255, 255, 255);\">KNX devices that use KNX Connection Authorization and support Option 1 are, depending on the implementation, vulnerable to being locked and users being unable to reset them to gain access to the device. The BCU key feature on the devices can be used to create a password for the device, but this password can often not be reset without entering the current password. If the device is configured to interface with a network, an attacker with access to that network could interface with the KNX installation, purge all devices without additional security options enabled, and set a BCU key, locking the device. Even if a device is not connected to a network, an attacker with physical access to the device could also exploit this vulnerability in the same way. </span>\n\n"}], "value": "\nKNX devices that use KNX Connection Authorization and support Option 1 are, depending on the implementation, vulnerable to being locked and users being unable to reset them to gain access to the device. The BCU key feature on the devices can be used to create a password for the device, but this password can often not be reset without entering the current password. If the device is configured to interface with a network, an attacker with access to that network could interface with the KNX installation, purge all devices without additional security options enabled, and set a BCU key, locking the device. Even if a device is not connected to a network, an attacker with physical access to the device could also exploit this vulnerability in the same way. \n\n"}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-645", "description": "CWE-645 Overly Restrictive Account Lockout Mechanism", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6", "shortName": "icscert", "dateUpdated": "2023-08-29T19:38:55.399Z"}, "references": [{"tags": ["government-resource"], "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01"}], "source": {"discovery": "UNKNOWN"}, "workarounds": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "\n\n<span style=\"background-color: rgb(255, 255, 255);\">The KNX Association recommends users always set the BCU Key in every KNX Project that is already finished and will be commissioned in the future. Handover the BCU Key as part of the Project Documentation to the Building Owner. </span>\n\n<br>"}], "value": "\nThe KNX Association recommends users always set the BCU Key in every KNX Project that is already finished and will be commissioned in the future. Handover the BCU Key as part of the Project Documentation to the Building Owner. \n\n\n"}], "x_generator": {"engine": "Vulnogram 0.1.0-dev"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T07:24:04.770Z"}, "title": "CVE Program Container", "references": [{"tags": ["government-resource", "x_transferred"], "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01"}]}]}}

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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:knx:connection_authorization:-:*:*:*:*:*:*:*", "matchCriteriaId": "F328E1CB-8666-4D06-B2BC-9532454AF906", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "\nKNX devices that use KNX Connection Authorization and support Option 1 are, depending on the implementation, vulnerable to being locked and users being unable to reset them to gain access to the device. The BCU key feature on the devices can be used to create a password for the device, but this password can often not be reset without entering the current password. If the device is configured to interface with a network, an attacker with access to that network could interface with the KNX installation, purge all devices without additional security options enabled, and set a BCU key, locking the device. Even if a device is not connected to a network, an attacker with physical access to the device could also exploit this vulnerability in the same way. \n\n"}, {"lang": "es", "value": "Los dispositivos KNX que utilizan la autorizaci\u00f3n de conexi\u00f3n KNX y admiten la Opci\u00f3n 1 son, seg\u00fan la implementaci\u00f3n, vulnerables a ser bloqueados y los usuarios no pueden restablecerlos para obtener acceso al dispositivo. La funci\u00f3n de clave BCU en los dispositivos se puede usar para crear una contrase\u00f1a para el dispositivo, pero esta contrase\u00f1a a menudo no se puede restablecer sin ingresar la contrase\u00f1a actual. Si el dispositivo est\u00e1 configurado para interactuar con una red, un atacante con acceso a esa red podr\u00eda interactuar con la instalaci\u00f3n KNX, purgar todos los dispositivos sin opciones de seguridad adicionales habilitadas y configurar una clave BCU, bloqueando el dispositivo. Incluso si un dispositivo no est\u00e1 conectado a una red, un atacante con acceso f\u00edsico al dispositivo tambi\u00e9n podr\u00eda aprovechar esta vulnerabilidad de la misma manera.\n"}], "id": "CVE-2023-4346", "lastModified": "2023-09-11T17:47:59.647", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "ics-cert@hq.dhs.gov", "type": "Secondary"}]}, "published": "2023-08-29T20:15:10.300", "references": [{"source": "ics-cert@hq.dhs.gov", "tags": ["Third Party Advisory", "US Government Resource"], "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01"}], "sourceIdentifier": "ics-cert@hq.dhs.gov", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-645"}], "source": "ics-cert@hq.dhs.gov", "type": "Primary"}]}

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