Thinkphp错误使用Upload类导致getshell

 1<?php
 2namespace Home\Controller;
 3
 4use Think\Controller;
 5
 6class IndexController extends Controller
 7{
 8    public function index()
 9    {
10        show_source(__FILE__);
11    }
12    public function upload()
13    {
14        $uploadFile = $_FILES['file'] ;
15
16        if (strstr(strtolower($uploadFile['name']), ".php") ) {
17            return false;
18        }
19
20        $upload = new \Think\Upload();// 实例化上传类
21        $upload->maxSize  = 4096 ;// 设置附件上传大小
22        $upload->allowExts  = array('jpg', 'gif', 'png', 'jpeg');// 设置附件上传类型
23        $upload->rootPath = './Public/Uploads/';// 设置附件上传目录
24        $upload->savePath = '';// 设置附件上传子目录
25        $info = $upload->upload() ;
26        if(!$info) {// 上传错误提示错误信息
27          $this->error($upload->getError());
28          return;
29        }else{// 上传成功 获取上传文件信息
30          $url = __ROOT__.substr($upload->rootPath,1).$info['file']['savepath'].$info['file']['savename'] ;
31          echo json_encode(array("url"=>$url,"success"=>1));
32        }
33    }
34} 

1'saveName'     => array('uniqid', ''), //上传文件命名规则，[0]-函数名，[1]-参数，多个参数使用数组