nvd-json-data-feeds/CVE-2020/CVE-2020-72xx/CVE-2020-7212.json

{
  "id": "CVE-2020-7212",
  "sourceIdentifier": "cve@mitre.org",
  "published": "2020-03-06T20:15:12.707",
  "lastModified": "2020-03-09T16:55:14.563",
  "vulnStatus": "Analyzed",
  "descriptions": [
    {
      "lang": "en",
      "value": "The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2)."
    },
    {
      "lang": "es",
      "value": "La funci\u00f3n _encode_invalid_chars en el archivo util/url.py en la biblioteca urllib3 versiones 1.25.2 hasta 1.25.7 para Python, permite una denegaci\u00f3n de servicio (consumo de CPU) debido a un algoritmo ineficiente. La matriz percent_encodings contiene todas las coincidencias de las codificaciones porcentuales. No est\u00e1 desdoblada. Para una URL de longitud N, el tama\u00f1o de percent_encodings puede ser hasta O(N). El siguiente paso (normalizar los bytes codificados porcentualmente existentes) tambi\u00e9n ocupa hasta O(N) para cada paso, por lo que el tiempo total es O(N^2). Si se desdoblaran los porcentajes de codificaci\u00f3n, el tiempo para calcular _encode_invalid_chars ser\u00eda O(kN), donde k es como m\u00e1ximo 484 ((10+6*2)^2)."
    }
  ],
  "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:N/I:N/A:H",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "cvssMetricV2": [
      {
        "source": "nvd@nist.gov",
        "type": "Primary",
        "cvssData": {
          "version": "2.0",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:C",
          "accessVector": "NETWORK",
          "accessComplexity": "LOW",
          "authentication": "NONE",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 7.8
        },
        "baseSeverity": "HIGH",
        "exploitabilityScore": 10.0,
        "impactScore": 6.9,
        "acInsufInfo": false,
        "obtainAllPrivilege": false,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "weaknesses": [
    {
      "source": "nvd@nist.gov",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "1.25.2",
              "versionEndIncluding": "1.25.7",
              "matchCriteriaId": "C6E2E571-FF01-4577-BEE4-CD2F2448A06E"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/urllib3/urllib3/blob/master/CHANGES.rst",
      "source": "cve@mitre.org",
      "tags": [
        "Release Notes",
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://github.com/urllib3/urllib3/commit/a74c9cfbaed9f811e7563cfc3dce894928e0221a",
      "source": "cve@mitre.org",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://pypi.org/project/urllib3/1.25.8/",
      "source": "cve@mitre.org",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
      ]
    }
  ]
}