Vulnerability Note VU#330000
ZyXEL NBG-418N router uses default credentials and is vulnerable to cross-site request forgery
Original Release date: 10 Dec 2015 | Last revised: 10 Dec 2015
ZyXEL NBG-418N router, firmware version 1.00(AADZ.3)C0, uses default credentials and is vulnerable to cross-site request forgery.
CWE-255: Credentials Management – CVE-2015-7283
The ZyXEL NBG-418N web administration interface uses non-random default credentials of admin:1234. A local area network attacker can gain privileged access to a vulnerable device’s web management interfaces or leverage default credentials in remote attacks such as cross-site request forgery.
CWE-352: Cross-Site Request Forgery (CSRF) – CVE-2015-7284
The ZyXEL NBG-418N contains a global CSRF vulnerability. An attacker can perform actions with the same permissions as a victim user, provided the victim has an active session and is induced to trigger the malicious request. Note that in combination with default credentials, an attacker can establish an active session as part of an attack and therefore would not require a victim to be logged in.
The CVSS score below reflects CVE-2015-7282.
A remote, unauthenticated attacker may be able to execute arbitrary script in the context of the end-user’s browser session or perform actions as an authenticated user. A local area network attacker can take complete control of a device using default admin credentials.
The CERT/CC is currently unaware of a practical solution to this problem. Until these vulnerabilities are addressed, users should consider the following workarounds.
Restrict access and use strong passwords
As a general good security practice, only allow trusted hosts to connect to the LAN. Implement strong passwords for WiFi and for the web management interface. Strong passwords can help to prevent blind guessing attempts that would establish sessions for CSRF attacks. LAN hosts should not browse the Internet while the web management interface has an active session in a browser tab.
Vendor Information (Learn More)
VendorStatusDate NotifiedDate UpdatedZyXELAffected08 Oct 201510 Dec 2015If you are a vendor and your product is affected, let
CVSS Metrics (Learn More)
These vulnerabilities were reported by Joel Land of the CERT/CC.
This document was written by Joel Land.
10 Dec 2015
Date First Published:
10 Dec 2015
Date Last Updated:
10 Dec 2015
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