#VU54553 Missing Authentication for Critical Function in HBS 3 Hybrid Backup Sync - CVE-2021-28809
Published: July 5, 2021 / Updated: July 8, 2021
Vulnerability identifier: #VU54553
Vulnerability risk: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2021-28809
CWE-ID: CWE-306
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
HBS 3 Hybrid Backup Sync
HBS 3 Hybrid Backup Sync
Software vendor:
QNAP Systems, Inc.
QNAP Systems, Inc.
Description
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to missing authentication in the within the RTSS server. A remote non-authenticated attacker can send a specially crafted request to port 8899/TCP and execute arbitrary code in the context of the Administrator.
Remediation
Install updates from vendor's website.