FKIE_CVE-2020-8289

Vulnerability from fkie_nvd - Published: 2020-12-27 02:15 - Updated: 2026-06-17 03:26
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Summary
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.
References
support@hackerone.comhttp://seclists.org/fulldisclosure/2020/Dec/57Mailing List, Third Party Advisory
support@hackerone.comhttp://seclists.org/fulldisclosure/2020/Dec/58Mailing List, Third Party Advisory
support@hackerone.comhttps://github.com/geffner/CVE-2020-8289/blob/master/README.mdExploit, Third Party Advisory
support@hackerone.comhttps://hackerone.com/reports/818853Permissions Required
support@hackerone.comhttps://www.backblaze.com/blog/backblaze-cloud-backup-release-7-0-1/Third Party Advisory
support@hackerone.comhttps://youtu.be/W0THXbcX5V8Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2020/Dec/57Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2020/Dec/58Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/geffner/CVE-2020-8289/blob/master/README.mdExploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://hackerone.com/reports/818853Permissions Required
af854a3a-2127-422b-91ae-364da2661108https://www.backblaze.com/blog/backblaze-cloud-backup-release-7-0-1/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://youtu.be/W0THXbcX5V8Exploit, Third Party Advisory
Impacted products
Vendor Product Version
backblaze backblaze *
backblaze backblaze *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Backblaze",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "Backblaze for Windows before 7.0.1.433 and Backblaze for macOS before 7.0.1.434"
            }
          ]
        }
      ],
      "source": "support@hackerone.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:backblaze:backblaze:*:*:*:*:*:windows:*:*",
              "matchCriteriaId": "23E8143D-EC22-4EEB-8C12-FA4D929F0ADB",
              "versionEndExcluding": "7.0.1.433",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:backblaze:backblaze:*:*:*:*:*:macos:*:*",
              "matchCriteriaId": "ADD57DC1-0797-4367-A9AF-BBAC83BFD046",
              "versionEndExcluding": "7.0.1.434",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "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 validaci\u00f3n de certificado incorrecta en el asistente \"bztransmit\" debido a una lista blanca embebida de cadenas en URL donde la comprobaci\u00f3n est\u00e1 deshabilitada, lo que lleva a una posible ejecuci\u00f3n de c\u00f3digo remota por medio de la funcionalidad de actualizaci\u00f3n del cliente"
    }
  ],
  "id": "CVE-2020-8289",
  "lastModified": "2026-06-17T03:26:13.830",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 9.3,
          "confidentialityImpact": "COMPLETE",
          "integrityImpact": "COMPLETE",
          "vectorString": "AV:N/AC:M/Au:N/C:C/I:C/A:C",
          "version": "2.0"
        },
        "exploitabilityScore": 8.6,
        "impactScore": 10.0,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2020-12-27T02:15:14.480",
  "references": [
    {
      "source": "support@hackerone.com",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://seclists.org/fulldisclosure/2020/Dec/57"
    },
    {
      "source": "support@hackerone.com",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://seclists.org/fulldisclosure/2020/Dec/58"
    },
    {
      "source": "support@hackerone.com",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/geffner/CVE-2020-8289/blob/master/README.md"
    },
    {
      "source": "support@hackerone.com",
      "tags": [
        "Permissions Required"
      ],
      "url": "https://hackerone.com/reports/818853"
    },
    {
      "source": "support@hackerone.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.backblaze.com/blog/backblaze-cloud-backup-release-7-0-1/"
    },
    {
      "source": "support@hackerone.com",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://youtu.be/W0THXbcX5V8"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://seclists.org/fulldisclosure/2020/Dec/57"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://seclists.org/fulldisclosure/2020/Dec/58"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/geffner/CVE-2020-8289/blob/master/README.md"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Permissions Required"
      ],
      "url": "https://hackerone.com/reports/818853"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.backblaze.com/blog/backblaze-cloud-backup-release-7-0-1/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://youtu.be/W0THXbcX5V8"
    }
  ],
  "sourceIdentifier": "support@hackerone.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ],
      "source": "support@hackerone.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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