The Anatomy of Cross Site Scripting
by Gavin Zuchlinski - Friday, 7 November 2003.
Cross site scripting (XSS) flaws are a relatively common issue in web application security, but they are still extremely lethal. They are unique in that, rather than attacking a server directly, they use a vulnerable server as a vector to attack a client. This can lead to extreme difficulty in tracing attackers, especially when requests are not fully logged (such as POST requests). Many documents discuss the actual insertion of HTML into a vulnerable script, but stop short of explaining the full ramifications of what can be done with a successful XSS attack. While this is adequate for prevention, the exact impact of cross site scripting attacks has not been fully appreciated. This paper will explore those possibilities.

Download the paper in PDF format here.

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