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CVE-2020-8289

Estado: ModificadaAlta (7.8)—

Backblaze for Windows before 7.0.1.433 and Backblaze for macOS before 7.0.1.434 suffer from improper certificate validation in `bztransmit` helper due to hardcoded whitelist of strings in URLs where validation is disabled leading to possible remote code execution via client update functionality.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Backblaze — Backblaze

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2020-8289",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 9.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:C/I:C/A:C",
          "authentication": "NONE",
          "integrityImpact": "COMPLETE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "COMPLETE"
        },
        "acInsufInfo": false,
        "impactScore": 10,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "support@hackerone.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "Backblaze",
          "versions": [
            {
              "status": "affected",
              "version": "Backblaze for Windows before 7.0.1.433 and Backblaze for macOS before 7.0.1.434"
            }
          ]
        }
      ]
    }
  ],
  "published": "2020-12-27T02:15:14.480",
  "references": [
    {
      "url": "http://seclists.org/fulldisclosure/2020/Dec/57",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "support@hackerone.com"
    },
    {
      "url": "http://seclists.org/fulldisclosure/2020/Dec/58",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "support@hackerone.com"
    },
    {
      "url": "https://github.com/geffner/CVE-2020-8289/blob/master/README.md",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "source": "support@hackerone.com"
    },
    {
      "url": "https://hackerone.com/reports/818853",
      "tags": [
        "Permissions Required"
      ],
      "source": "support@hackerone.com"
    },
    {
      "url": "https://www.backblaze.com/blog/backblaze-cloud-backup-release-7-0-1/",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "support@hackerone.com"
    },
    {
      "url": "https://youtu.be/W0THXbcX5V8",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "source": "support@hackerone.com"
    },
    {
      "url": "http://seclists.org/fulldisclosure/2020/Dec/57",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://seclists.org/fulldisclosure/2020/Dec/58",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/geffner/CVE-2020-8289/blob/master/README.md",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://hackerone.com/reports/818853",
      "tags": [
        "Permissions Required"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.backblaze.com/blog/backblaze-cloud-backup-release-7-0-1/",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://youtu.be/W0THXbcX5V8",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "support@hackerone.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Backblaze for Windows before 7.0.1.433 and Backblaze for macOS before 7.0.1.434 suffer from improper certificate validation in `bztransmit` helper due to hardcoded whitelist of strings in URLs where validation is disabled leading to possible remote code execution via client update functionality."
    },
    {
      "lang": "es",
      "value": "Backblaze para Windows versiones anteriores a 7.0.1.433 y Backblaze para macOS versiones anteriores a 7.0.1.434, sufren de una validación de certificado incorrecta en el asistente \"bztransmit\" debido a una lista blanca embebida de cadenas en URL donde la comprobación está deshabilitada, lo que lleva a una posible ejecución de código remota por medio de la funcionalidad de actualización del cliente"
    }
  ],
  "lastModified": "2026-06-17T03:26:13.830",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:backblaze:backblaze:*:*:*:*:*:windows:*:*",
              "vulnerable": true,
              "matchCriteriaId": "23E8143D-EC22-4EEB-8C12-FA4D929F0ADB",
              "versionEndExcluding": "7.0.1.433"
            },
            {
              "criteria": "cpe:2.3:a:backblaze:backblaze:*:*:*:*:*:macos:*:*",
              "vulnerable": true,
              "matchCriteriaId": "ADD57DC1-0797-4367-A9AF-BBAC83BFD046",
              "versionEndExcluding": "7.0.1.434"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "support@hackerone.com"
}