Some vulnerabilities have been reported in ZyXEL P-330W, which can be exploited by malicious people to conduct cross-site scripting and request forgery attacks.
1) Input passed to the parameter "pingstr" in ping.asp is not properly sanitised before being returned to a user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.
2) Various vulnerabilities are caused due to the device allowing users to perform certain actions via HTTP requests without performing any validity checks to verify the request. This can be exploited to e.g. change the administrator's password.
Note: Reportedly, the router runs a vulnerable version of GoAhead WebServer, which potentially can be exploited by malicious people to compromise the device.
Solution: Do not browse other websites while being logged into the device.
Provided and/or discovered by: Santa Clause
Original Advisory: http://lists.grok.org.uk/pipermail/full-disclosure/2007-December/059295.html
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Subject: ZyXEL P-330W Cross-Site Scripting and Request Forgery Vulnerabilities