Vulnerability identifier: #VU34061
Vulnerability risk: Medium
CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-284
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Zyxel NAS 326
Hardware solutions /
Firmware
NAS520
Hardware solutions /
Routers for home users
NAS540
Hardware solutions /
Routers for home users
NAS542
Hardware solutions /
Routers for home users
Vendor: ZyXEL Communications Corp.
Description
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.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
Zyxel NAS 326: All versions
NAS520: All versions
NAS540: All versions
NAS542: All versions
External links
http://www.zyxel.com/support/Zyxel-security-advisory-for-NAS-remote-access-vulnerability.shtml
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.