Improper access control in ZyXEL Communications Corp. products - CVE-2020-13365
Published: August 5, 2020
Vulnerability identifier: #VU34062
CSH Severity: Medium
CVSS v4 BT: 6.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2020-13365
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to improper access restrictions in a CGI script for the web application. A remote authenticated attacker can start a Telnet or SSH service and generate a password for the "NsaRescueAngel" user account with root privileges.
Affected software
Zyxel NAS 326
NAS520
NAS540
NAS542
NAS520
NAS540
NAS542
How to mitigate CVE-2020-13365
Install updates from vendor's website.
Zyxel NAS 326 - update to V5.21(AAZF.9)C0
NAS520 - update to V5.21(AASZ.5)C0
NAS540 - update to V5.21(AATB.6)C0
NAS542 - update to V5.21(ABAG.6)C0
NAS520 - update to V5.21(AASZ.5)C0
NAS540 - update to V5.21(AATB.6)C0
NAS542 - update to V5.21(ABAG.6)C0