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View previous topic :: View next topic Help to evade xss filter... Posted: Mon Feb 14, 2011 4:35 am aritmos Advanced user Joined: Jul 21, 2008 Posts: 82 Location: Inside a salted MD5 I send this XSS: "><script>alert('xss')</script><f Browser you can see: "><script>alert('xss')<%2Fscript><f And source code generated: <input name="query" value="&quot;&gt;&lt;script&gt;alert('xss')&lt;/script&gt;&lt;f" class="text text_query query" id="query" type="text"> how can i evade the filters? Posted: Mon Feb 14, 2011 5:41 pm Cyko Moderator Joined: Jul 21, 2009 Posts: 375 Problems: 1. Double quotes are converted to entities. 2. The < and > characters are also converted to entities. Theirfore (too my knowledge) you can't brake out of the value attribute (in that format) - which is whats needed to execute/parse any JavaScript (as the value attribute can't execute/parse JavaScript on its own). If the attribute was an on* (onclick, onhover etc.) attribute their would'nt be any problems (as their'd be no need to use double quotes or < and > characters) - infact it would be a breeze. On a side note to the site owner - I assume the site is using htmlspecialchars(), I'd recommend to set the second paremeter to ENT_QUOTES to allow not only double quotes but single too (as currently its just converting double) - always a good idea to further migitate the risk of XSS attacks. More info: http://www.w3schools.com/tags/att_input_value.asp http://ha.ckers.org/xss.html Posted: Tue Feb 15, 2011 8:55 am aritmos Advanced user Joined: Jul 21, 2008 Posts: 82 Location: Inside a salted MD5 then...is it imposible to do a xss injection? 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