CVE-2020-8289

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 v3 7.8 HIGH
CVSS v2.0 9.3 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

9.3^/10

CVSS v2.0 : HIGH

Vector : AV:N/AC:M/Au:N/C:C/I:C/A:C

Exploitability : 8.6 / Impact : 10.0

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact COMPLETE

Integrity Impact COMPLETE

Availability Impact COMPLETE

References

Link	Resource
http://seclists.org/fulldisclosure/2020/Dec/57	Mailing List Third Party Advisory
http://seclists.org/fulldisclosure/2020/Dec/58	Mailing List Third Party Advisory
https://github.com/geffner/CVE-2020-8289/blob/master/README.md	Exploit Third Party Advisory
https://hackerone.com/reports/818853	Permissions Required
https://www.backblaze.com/blog/backblaze-cloud-backup-release-7-0-1/	Third Party Advisory
https://youtu.be/W0THXbcX5V8	Exploit Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:backblaze:backblaze::::::windows::*
	cpe:2.3:a:backblaze:backblaze::::::macos::*

History

No history.

Information

Published : 2020-12-27 02:15

Updated : 2024-02-28 18:08

NVD link : CVE-2020-8289

Mitre link : CVE-2020-8289

CVE.ORG link : CVE-2020-8289

JSON object : View

Products Affected

backblaze

backblaze

CWE

CWE-295

Improper Certificate Validation

{"id": "CVE-2020-8289", "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": 10.0, "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}]}, "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"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-295"}]}, {"type": "Secondary", "source": "support@hackerone.com", "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 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"}], "lastModified": "2020-12-31T19:04:39.117", "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"}