PHP遇上Windows的绕过上传

这个是在wooyun中发现的一篇奇葩的上传…算是长知识了…

环境配置:Winserver08+IIS7.5+php(IIs7以上就可以直接安装个phpmanager来配置php环境了.) 两个文件upload.html和upload_deal.php upload.html:

<html>
 <body>
  <form method="post" action="upload_deal.php" enctype="multipart/form-data">
   <input type="file" name="file" value=""/>
   <input type="hidden" name="filename" value="file"/>
   <input type="submit" name="submit" value="upload"/>
  </form>
 </body>
</html>

upload_deal.php:

<?php
if(isset($_POST['submit'])){
	$filename = $_POST['filename'];
	$filename = preg_replace("/[^\w]/i", "", $filename);
	$upfile = $_FILES['file']['name'];
        $upfile = str_replace(';',"",$upfile);
	$upfile = preg_replace("/[^(\w|\:|\$|\.|\<|\>)]/i", "", $upfile);
	$tempfile = $_FILES['file']['tmp_name'];
	$ext = trim(get_extension($upfile)); // null
	if(in_array($ext,array('php','php3','php5'))){
		die('Warning ! File type error..');
	}
	if($ext == 'asp' or $ext == 'asa' or $ext == 'cer' or $ext == 'cdx' or $ext == 'aspx' or $ext == 'htaccess') $ext = 'file';
	$savefile = 'upload/'.$filename.".".$ext;
	if(move_uploaded_file($tempfile,$savefile)){
		die('Success upload..path :'.$savefile);
	}else{
		die('Upload failed..');
	}
}
function get_extension($file){
	return strtolower(substr($file, strrpos($file, '.')+1));
}
?>