PT-2021-23722 · Kaseya · Kaseya Unitrends Backup Appliance

Rich Mirch · Published 2021-12-06 · Updated 2023-08-08 · CVE-2021-43033

Positive Technologies (AI Summary)

CVSS v2.0

10

Critical

Base vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

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 multiple functions in the bpserverd daemon were vulnerable to arbitrary remote code execution as root. The vulnerability was caused by untrusted input being passed to system calls.

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 bpserverd daemon to minimize the risk of exploitation.

Exploit

Fix

OS Command Injection

Weakness Enumeration

CWE-78

Related Identifiers

CVE-2021-43033

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://nvd.nist.gov/vuln/detail/CVE-2021-43033 · Security Note
• https://osv.dev/vulnerability/CVE-2021-43033 · Vendor Advisory
• https://helpdesk.kaseya.com/hc/en-gb/articles/4412762258961 · Vendor Advisory
• https://t.me/cvenotify/38606 · Telegram Post
• https://t.me/cibsecurity/33358 · Telegram Post
• https://t.me/cvenotify/38300 · Telegram Post