PT-2021-23723 · Kaseya · Kaseya Unitrends Backup Appliance

Rich Mirch · Published 2021-12-06 · Updated 2022-11-29 · CVE-2021-43034

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 Kaseya Unitrends Backup Appliance versions prior to 10.5.5

Description An issue was discovered in the Kaseya Unitrends Backup Appliance, where a world writable file allowed local users to execute arbitrary code as the user apache, leading to privilege escalation.

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 world writable file to minimize the risk of exploitation.

Exploit

Fix

Incorrect Permission

Weakness Enumeration

CWE-732

Related Identifiers

CVE-2021-43034

Affected Products

Kaseya Unitrends Backup Appliance

References · 8

• 🔥 https://cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-1 · Exploit
• 🔥 https://cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-2 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-43034 · Security Note
• https://helpdesk.kaseya.com/hc/en-gb/articles/4412762258961 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-43034 · Vendor Advisory
• https://t.me/cibsecurity/33361 · Telegram Post
• https://t.me/cvenotify/38605 · Telegram Post
• https://t.me/cvenotify/38299 · Telegram Post