{
  "id": "CVE-2021-43572",
  "sourceIdentifier": "cve@mitre.org",
  "published": "2021-11-09T22:15:07.727",
  "lastModified": "2022-03-24T15:57:18.287",
  "vulnStatus": "Analyzed",
  "descriptions": [
    {
      "lang": "en",
      "value": "The verify function in the Stark Bank Python ECDSA library (aka starkbank-escada or ecdsa-python) before 2.0.1 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages."
    },
    {
      "lang": "es",
      "value": "La funci\u00f3n verify de la biblioteca ECDSA de Stark Bank Python (tambi\u00e9n conocida como starkbank-escada o ecdsa-python) anterior a la versi\u00f3n 2.0.1 no comprueba que la firma sea distinta de cero, lo que permite a los atacantes falsificar firmas en mensajes arbitrarios"
    }
  ],
  "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:H/A:H",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9
      }
    ],
    "cvssMetricV2": [
      {
        "source": "nvd@nist.gov",
        "type": "Primary",
        "cvssData": {
          "version": "2.0",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "accessVector": "NETWORK",
          "accessComplexity": "LOW",
          "authentication": "NONE",
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "availabilityImpact": "PARTIAL",
          "baseScore": 7.5
        },
        "baseSeverity": "HIGH",
        "exploitabilityScore": 10.0,
        "impactScore": 6.4,
        "acInsufInfo": false,
        "obtainAllPrivilege": false,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "weaknesses": [
    {
      "source": "nvd@nist.gov",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:starkbank:ecdsa-python:*:*:*:*:*:*:*:*",
              "versionEndExcluding": "2.0.1",
              "matchCriteriaId": "62CFD9C8-BA6A-47ED-B3EE-254980A95216"
            }
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  ],
  "references": [
    {
      "url": "https://github.com/starkbank/ecdsa-python/commit/d136170666e9510eb63c2572551805807bd4c17f",
      "source": "cve@mitre.org",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://github.com/starkbank/ecdsa-python/releases/tag/v2.0.1",
      "source": "cve@mitre.org",
      "tags": [
        "Release Notes",
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/",
      "source": "cve@mitre.org",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ]
    }
  ]
}