{
  "id": "CVE-2020-12884",
  "sourceIdentifier": "cve@mitre.org",
  "published": "2020-06-18T19:15:09.973",
  "lastModified": "2020-06-25T14:41:37.117",
  "vulnStatus": "Analyzed",
  "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"
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "nvd@nist.gov",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.2
      }
    ],
    "cvssMetricV2": [
      {
        "source": "nvd@nist.gov",
        "type": "Primary",
        "cvssData": {
          "version": "2.0",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:P",
          "accessVector": "NETWORK",
          "accessComplexity": "LOW",
          "authentication": "NONE",
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 6.4
        },
        "baseSeverity": "MEDIUM",
        "exploitabilityScore": 10.0,
        "impactScore": 4.9,
        "acInsufInfo": false,
        "obtainAllPrivilege": false,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "weaknesses": [
    {
      "source": "nvd@nist.gov",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:arm:mbed_os:5.15.3:*:*:*:*:*:*:*",
              "matchCriteriaId": "B314FCEF-12B7-4510-AC5E-12D3574E3E68"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/ARMmbed/mbed-coap/pull/116",
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://github.com/ARMmbed/mbed-os/issues/12928",
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory"
      ]
    }
  ]
}