Vulnerability in Backblaze
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.
Vulnerability class: Improper Certificate Validation
EPSS: 0.047 (90.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Backblaze
- N/a Backblaze — versions Backblaze for Windows before 7.0.1.433 and Backblaze for macOS before 7.0.1.434
Weakness classification (CWE)
Public proof-of-concept exploits
References
- support@hackerone.com (Permissions Required, x_refsource_MISC)
- support@hackerone.com (Exploit, Third Party Advisory, x_refsource_MISC)
- support@hackerone.com (Exploit, Third Party Advisory, x_refsource_MISC)
- support@hackerone.com (Third Party Advisory, x_refsource_MISC)
- support@hackerone.com (mailing-list, x_refsource_FULLDISC, Mailing List, Third Party Advisory)
- support@hackerone.com (mailing-list, x_refsource_FULLDISC, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-8289?
- CVE-2020-8289 is a high-severity vulnerability in Backblaze, classified under Improper Certificate Validation. CVSS score: 7.8/10. Published 2020-12-27.
- How severe is CVE-2020-8289?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2020-8289 known to be exploited?
- 8 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.