CVE-2020-8289 Information

Description

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 Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Reference

https://github.com/geffner/CVE-2020-8289/blob/master/README.md https://www.backblaze.com/blog/backblaze-cloud-backup-release-7-0-1/ https://youtu.be/W0THXbcX5V8 https://hackerone.com/reports/818853 http://seclists.org/fulldisclosure/2020/Dec/58 http://seclists.org/fulldisclosure/2020/Dec/57

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8