PT-2020-20081 · Backblaze · Backblaze For Macos+1

Published 2020-12-27 · Updated 2020-12-31 · CVE-2020-8290

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Backblaze for Windows versions prior to 7.0.0.439 Backblaze for macOS versions prior to 7.0.0.439

Description The issue is related to improper privilege management in the bztransmit helper, specifically due to a lack of permission handling and validation before creating client update directories. This allows for local escalation of privilege via a rogue client update binary.

Recommendations For Backblaze for Windows versions prior to 7.0.0.439, update to version 7.0.0.439 or later to resolve the issue. For Backblaze for macOS versions prior to 7.0.0.439, update to version 7.0.0.439 or later to resolve the issue. As a temporary workaround, consider restricting access to the bztransmit helper until a patch is applied.

Exploit

Fix

Improper Privilege Management

Weakness Enumeration

CWE-269

Related Identifiers

CVE-2020-8290

Affected Products

Backblaze For Windows

Backblaze For Macos

References · 7

• 🔥 https://github.com/geffner/CVE-2020-8290/blob/master/README.md · Exploit
• 🔥 https://youtu.be/OpC6neWd2aM · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2020-8290 · Security Note
• https://osv.dev/vulnerability/CVE-2020-8290 · Vendor Advisory
• https://t.me/cvenotify/7774 · Telegram Post
• https://hackerone.com/reports/818857 · Note
• https://t.me/cvenotify/8041 · Telegram Post