PT-2021-23730 · Kaseya · Kaseya Unitrends Backup Appliance

Published 2021-12-06 · Updated 2022-11-28 · CVE-2021-43041

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 in the Kaseya Unitrends Backup Appliance, where a crafted HTTP request could induce a format string vulnerability in the privileged vaultServer application.

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 application until a patch is applied.

Exploit

Fix

Use of Externally-Controlled Format String

Weakness Enumeration

CWE-134

Related Identifiers

CVE-2021-43041

Affected Products

Kaseya Unitrends Backup Appliance

References · 9

• 🔥 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://helpdesk.kaseya.com/hc/en-gb/articles/4412762258961 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-43041 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-43041 · Security Note
• https://t.me/cvenotify/38296 · Telegram Post
• https://t.me/cvenotify/24273 · Telegram Post
• https://t.me/cvenotify/24249 · Telegram Post
• https://t.me/cibsecurity/33355 · Telegram Post