PT-2021-23729 · Kaseya · Kaseya Unitrends Backup Appliance

Rich Mirch · CVE-2021-43040 · Published 2021-12-06 · Updated 2022-11-28

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:N/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 where the privileged vaultServer could be leveraged to create arbitrary writable files, 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 vaultServer to minimize the risk of exploitation.

Exploit

Fix

Related Identifiers

CVE-2021-43040

Affected Products

Kaseya Unitrends Backup Appliance

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://osv.dev/vulnerability/CVE-2021-43040 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-43040 · Security Note
• https://helpdesk.kaseya.com/hc/en-gb/articles/4412762258961 · Vendor Advisory
• https://t.me/cvenotify/24275 · Telegram Post
• https://t.me/cvenotify/24250 · Telegram Post
• https://t.me/cibsecurity/33359 · Telegram Post