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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.047 (91.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 91.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.047 · newest: 0.047 · change: 0.000
Affected products
- Backblaze
- 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
- hackerone.com/reports/818853 (Permissions Required)
- youtu.be/W0THXbcX5V8 (Exploit, Third Party Advisory)
- github.com/geffner/CVE-2020-8289/blob/master/README.md (Exploit, Third Party Advisory)
- www.backblaze.com/blog/backblaze-cloud-backup-release-7-0-1/ (Third Party Advisory)
- seclists.org/fulldisclosure/2020/Dec/57 (mailing-list, Mailing List, Third Party Advisory)
- seclists.org/fulldisclosure/2020/Dec/58 (mailing-list, 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.