CVE-2020-12884

{"id": "CVE-2020-12884", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 6.4, "accessVector": "NETWORK", "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:P", "authentication": "NONE", "integrityImpact": "NONE", "accessComplexity": "LOW", "availabilityImpact": "PARTIAL", "confidentialityImpact": "PARTIAL"}, "acInsufInfo": false, "impactScore": 4.9, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 10.0, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.1, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 3.9}]}, "published": "2020-06-18T19:15:09.973", "references": [{"url": "https://github.com/ARMmbed/mbed-coap/pull/116", "tags": ["Third Party Advisory"], "source": "cve@mitre.org"}, {"url": "https://github.com/ARMmbed/mbed-os/issues/12928", "tags": ["Third Party Advisory"], "source": "cve@mitre.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-125"}]}], "descriptions": [{"lang": "en", "value": "A buffer over-read was discovered in the CoAP library in Arm Mbed OS 5.15.3. The CoAP parser is responsible for parsing received CoAP packets. The function sn_coap_parser_options_parse_multiple_options() parses CoAP options that may occur multiple consecutive times in a single packet. While processing the options, packet_data_pptr is accessed after being incremented by option_len without a prior out-of-bounds memory check. The temp_parsed_uri_query_ptr is validated for a correct range, but the range valid for temp_parsed_uri_query_ptr is derived from the amount of allocated heap memory, not the actual input size. Therefore the check of temp_parsed_uri_query_ptr may be insufficient for safe access to the area pointed to by packet_data_pptr. As a result, access to a memory area outside of the intended boundary of the packet buffer is made."}, {"lang": "es", "value": "Se detect\u00f3 una lectura excesiva del b\u00fafer en la biblioteca CoAP en Arm Mbed OS versi\u00f3n 5.15.3. El analizador CoAP es responsable de analizar los paquetes CoAP recibidos. La funci\u00f3n sn_coap_parser_options_parse_multiple_options() analiza las opciones de CoAP que pueden presentarse varias veces consecutivas en un solo paquete. Mientras se procesan las opciones, se accede a packet_data_pptr despu\u00e9s de ser incrementado por option_len sin una comprobaci\u00f3n previa de memoria fuera de l\u00edmites. Temp_parsed_uri_query_ptr es comprobada para un rango correcto, pero el rango v\u00e1lido para temp_parsed_uri_query_ptr es derivado de la cantidad de memoria de pila asignada, no del tama\u00f1o de entrada real. Por lo tanto, la comprobaci\u00f3n de temp_parsed_uri_query_ptr puede ser insuficiente para un acceso seguro al \u00e1rea se\u00f1alada por packet_data_pptr. Como resultado, se realiza el acceso a un \u00e1rea de memoria fuera del l\u00edmite previsto del b\u00fafer de paquetes"}], "lastModified": "2020-06-25T14:41:37.117", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:arm:mbed_os:5.15.3:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B314FCEF-12B7-4510-AC5E-12D3574E3E68"}], "operator": "OR"}]}], "sourceIdentifier": "cve@mitre.org"}