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I am playing one pentesting game theres a task where i need to perform multi line xss to print cookies.

I was able to make xss that print "x" because one line is too short for entire command so this works "><script>alert("x")</script>( this is max length of field and we have three fields available)

But i need to use this "><script>alert(document.cookie)</script> and dont know how to modify it for three fields that i have for this task.

Thanks for any help

  • Hi. Welcome to Security.SE. Without additional information it's hard to answer this question. Can you clarify? – h4ckNinja Jun 30 at 20:57
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The common way to do this is to span the payload across multiple parameters.For example imagine there are three parameter's param1,param2,param3.

param1=<script><then begin comment block>

param2=<end comment block>alert(document.cookie)<start comment block>

param3=<end comment block><script>

So the general idea is to comment out the middle that way you can stretch the payload, whenever there is a (number of character restriction).

Adjust the payload according to the number of allowed characters in the parameter's.

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