omnipresent has discovered some vulnerabilities in ASPScriptz Guest Book, which can be exploited by malicious people to conduct script insertion attacks.
Input passed to the "GBOOK_UNAME", "GBOOK_EMAIL", "GBOOK_CITY", "GBOOK_COU", "GBOOK_WWW", and "GBOOK_MESS" form field parameters in submit.asp is not properly sanitised before being used. This can be exploited to insert arbitrary HTML and script code, which will be executed in a user's browser session in context of an affected site when a malicious entry is viewed.
The vulnerabilities have been confirmed in version 2.0. Other versions may also be affected.
Solution: Edit the source code to ensure that input is properly sanitised.
Provided and/or discovered by: omnipresent
Original Advisory: http://colander.altervista.org/advisory/ASzGB.txt
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Subject: ASPScriptz Guest Book "submit.asp" Script Insertion Vulnerabilities
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