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COMMAND ISC guestbook script injection vulnerability SYSTEMS AFFECTED current version PROBLEM Black Tigerz Research Group [www.blacktigerz.org] found following about ISC guestbook, Free, easy to use asp powered guestbook. Main fetures are: web-based administration, bad word filtering [http://www.isc-online.at/]. gb_eintragen.asp neglects filtering user input allowing for script injection to the guestbook via "Ihr Name", "Ihre EMail" and "Ihre Homepage" fields. The injected script will be executed in anyones browser who visits the guestbook. SOLUTION ??