PT-2021-23726 · Unitrends+1 · Unitrends Windows Agent+1

Published 2021-12-06 · Updated 2022-11-28 · CVE-2021-43037

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Kaseya Unitrends Backup Appliance versions prior to 10.5.5

Description An issue was discovered in the Unitrends Windows agent, which was vulnerable to DLL injection and binary planting due to insecure default permissions. This allowed privilege escalation from an unprivileged user to SYSTEM.

Recommendations For versions prior to 10.5.5, update to version 10.5.5 or later to resolve the issue. As a temporary workaround, consider restricting access to the Unitrends Windows agent to minimize the risk of exploitation.

Exploit

Fix

Uncontrolled Search Path Element

Weakness Enumeration

CWE-427

Related Identifiers

CVE-2021-43037

Affected Products

Kaseya Unitrends Backup Appliance

Unitrends Windows Agent

References · 8

• 🔥 https://cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-2 · Exploit
• 🔥 https://cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-1 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-43037 · Security Note
• https://helpdesk.kaseya.com/hc/en-gb/articles/4412762258961 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-43037 · Vendor Advisory
• https://t.me/cvenotify/24253 · Telegram Post
• https://t.me/cibsecurity/33364 · Telegram Post
• https://t.me/cvenotify/38297 · Telegram Post