Privilege escalation in Backblaze
CVE-2020-8290
Backblaze for Windows and Backblaze for macOS before 7.0.0.439 suffer from improper privilege management in `bztransmit` helper due to lack of permission handling and validation before creation of client update directories allowing for local escalation of privilege via rogue client update binary.
Vulnerability class: Privilege Escalation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (46.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000
Affected products
- Backblaze
- Backblaze — versions Prior to 7.0.0.439
Weakness classification (CWE)
Public proof-of-concept exploits
References
- hackerone.com/reports/818857 (Permissions Required)
- youtu.be/OpC6neWd2aM (Exploit, Third Party Advisory)
- github.com/geffner/CVE-2020-8290/blob/master/README.md (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-8290?
- CVE-2020-8290 is a high-severity vulnerability in Backblaze, classified under Improper Privilege Management. CVSS score: 7.8/10. Published 2020-12-27.
- How severe is CVE-2020-8290?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2020-8290 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.