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www.waraxe.us Forum Index -> Newbies corner -> $_GET Hack
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$_GET Hack
PostPosted: Wed Jun 18, 2008 12:59 pm Reply with quote
Xelion
Regular user
Regular user
 
Joined: Jun 13, 2008
Posts: 15




Hi,
I would like to know if there is a possibility to hack from displaying a $_GET:
Code:

<? PHP
echo $ _GET [ 'trick'];
?>
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PostPosted: Wed Jun 18, 2008 1:41 pm Reply with quote
waraxe
Site admin
Site admin
 
Joined: May 11, 2004
Posts: 2407
Location: Estonia, Tartu




Classical reflected XSS:

Code:

http://target.com/index.php?trick=<script>alert(document.cookie);</script>
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PostPosted: Wed Jun 18, 2008 6:14 pm Reply with quote
Xelion
Regular user
Regular user
 
Joined: Jun 13, 2008
Posts: 15




Thank's
The code is :
Code:
<? if (isset($_GET['trick']))
echo '<span class="trick">'.$_GET['trick'].'</span><br/>';
?>


But if I do :

Code:
http://target.com/index.php?trick<script>alert(document.cookie);</script>


The code is :
Code:
<span class="trick">&lt;script&gt;alert(document.cookie);&lt;/script&gt;</span><br />
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PostPosted: Thu Jun 19, 2008 12:47 am Reply with quote
gibbocool
Advanced user
Advanced user
 
Joined: Jan 22, 2008
Posts: 208




Are you sure that is what the code is? Because of that behavior i think it's:

<? if (isset($_GET['trick']))
echo '<span class="trick">'.htmlspecialchars($_GET['trick']).'</span><br/>';
?>

you can only try url encode the "<script>alert(document.cookie);</script>" first but i doubt that will work.

_________________
http://www.gibbocool.com
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PostPosted: Thu Jun 19, 2008 10:21 am Reply with quote
Xelion
Regular user
Regular user
 
Joined: Jun 13, 2008
Posts: 15




Yes I'm sure Sad

Otherwise I try to trust someone who send a PHP script to find a loophole =)
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$_GET Hack
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