CVE-2018-19417

{"id": "CVE-2018-19417", "cveTags": [], "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 10.0, "accessVector": "NETWORK", "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C", "authentication": "NONE", "integrityImpact": "COMPLETE", "accessComplexity": "LOW", "availabilityImpact": "COMPLETE", "confidentialityImpact": "COMPLETE"}, "acInsufInfo": false, "impactScore": 10.0, "baseSeverity": "HIGH", "obtainAllPrivilege": false, "exploitabilityScore": 10.0, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV30": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.0", "baseScore": 10.0, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 3.9}]}, "published": "2018-11-21T20:29:00.307", "references": [{"url": "https://github.com/contiki-ng/contiki-ng/issues/600", "tags": ["Exploit", "Third Party Advisory"], "source": "cve@mitre.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-119"}]}], "descriptions": [{"lang": "en", "value": "An issue was discovered in the MQTT server in Contiki-NG before 4.2. The function parse_publish_vhdr() that parses MQTT PUBLISH messages with a variable length header uses memcpy to input data into a fixed size buffer. The allocated buffer can fit only MQTT_MAX_TOPIC_LENGTH (default 64) bytes, and a length check is missing. This could lead to Remote Code Execution via a stack-smashing attack (overwriting the function return address). Contiki-NG does not separate the MQTT server from other servers and the OS modules, so access to all memory regions is possible."}, {"lang": "es", "value": "Se ha descubierto un problema en el servidor MQTT en Contiki-NG, en versiones anteriores a la 4.2. La funci\u00f3n parse_publish_vhdr() que analiza los mensajes MQTT PUBLISH con una cabecera length variable emplea memcpy para introducir datos en un tama\u00f1o de b\u00fafer fijo. El b\u00fafer asignado solo puede ajustarse a MQTT_MAX_TOPIC_LENGTH (64 bytes por defecto) y carece de una comprobaci\u00f3n de longitud. Esto podr\u00eda conducir a la ejecuci\u00f3n remota de c\u00f3digo mediante un ataque de \"stack-smashing\" (que sobrescribe la direcci\u00f3n de retorno de la funci\u00f3n). Contiki-NG no separa el servidor MQTT de otros servidores y los m\u00f3dulos del sistema operativo, por lo que se puede acceder a todas las regiones de memoria."}], "lastModified": "2019-02-04T18:19:13.953", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:contiki-ng:contiki-ng:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "19FF5310-545E-48F8-880F-E20E885BEF85", "versionEndExcluding": "4.2"}], "operator": "OR"}]}], "sourceIdentifier": "cve@mitre.org"}