Improper Certificate Validation in Backblaze - CVE-2020-8289
Published: December 27, 2020 / Updated: January 11, 2021
Vulnerability identifier: #VU49189
CSH Severity: Medium
CVSS v4: 7.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-8289
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerability details
The vulnerability allows a remote attacker to perform MitM attack.
The vulnerability exists due to improper certificate validation in Backblaze for Windows before 7.0.1.433 and Backblaze for macOS before 7.0.1.434 in in `bztransmit` helper due to hardcoded whitelist of strings in URLs. A remote attacker can perform MitM attack, interfere with the update functionality.
Successful exploitation of the vulnerability may allow an attacker to compromise the affected system.
Affected software
Backblaze
How to mitigate CVE-2020-8289
Install updates from vendor's website.
Backblaze - update to 7.0.1