前言：

在资源搜索网盘下载到了这套源码，决定拿它练下手
分析一下代码的逻辑，加深对一些常见漏洞的理解。如果有什么不对的地方，欢迎师傅们指出。
源码是基于thinkphp5+mysql开发

前台SQL注入

漏洞位置 \application\index\controller\Goods.php

public function ajaxkdata()
    {
        //获取k线图数据，转化为array

        $pid = input('param.pid');
        $data = Db::name('productdata')->where('pid='.$pid)->find();
        $newdata = array();
        if($data){
            $data['UpdateTime'] = $data['UpdateTime'];
            $newdata[0]['price'] = $data['Price'];
            $newdata[0]['open'] = $data['Open'];
            $newdata[0]['close'] = $data['Close'];
            $newdata[0]['lowest'] = $data['Low'];
            $newdata[0]['highest'] = $data['High'];
            $newdata[0]['time'] = $data['UpdateTime'].'000';
            $newdata[0]['fulltime'] = date('Y-m-d H:i:s',$data['UpdateTime']);
            $newdata[0]['goodtime'] = date('Y-m-d H:i:s',$data['UpdateTime']);

        }

        return $newdata;
    }

$pid变量用input，拼接进了where查询，造成注入

payload:

SELECT * FROM xxxx WHERE ( pid=1) and updatexml(1,concat(0x7e,user(),0x7e),1) # ) LIMIT 1

SSRF

漏洞位置 \application\index\controller\Api.php

public function post_curl($url,$data){
  $ch = curl_init($url);
  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
  curl_setopt($ch, CURLOPT_POSTFIELDS,$data);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
  $result = curl_exec($ch);
  if (curl_errno($ch)) {
    print curl_error($ch);
  }
  curl_close($ch);
  return $result;
    }

这是典型的SSRF漏洞，代码没有过滤将传入的url值带入curl_exec函数造成SSRF

漏洞验证：

管理后台登录凭证伪造

漏洞位置 \application\admin\controller\Base.php

可以看到先是判断有没userid值，然后判断token是不是'nimashabi'用MD5加密的值

这里在检测otype是否等于3

otype userid的值可以在数据库中得到，这样就可以构造COOKIE进行登录后台

payload:

think_var=zh-cn;denglu=think:{"otype":"3","userid":"1","token":"3c341b110c44ad9e7da4160e4f865b63"}

后台任意文件上传

漏洞位置 \application\admin\controller\Setup.php

public function editconf()
    {


        if($this->otype != 3){
            echo '死你全家!';exit;
        }

        if(input('post.')){

            $data = input('post.');

            foreach ($data as $k => $v) {
                $arr = explode('_',$k);
                $_data['id'] = $arr[1];
                $_data['value'] = $v;
                $file = request()->file('pic_'.$_data['id']);

                if($file){

                    $info = $file->move(ROOT_PATH . 'public' . DS . 'uploads');
                    if($info){
                        $_data['value'] = '/public' . DS . 'uploads/'.$info->getSaveName();
                    }
                }
                if($_data['value'] == '' && isset($arr[2]) && $arr[2] == 3){
                    continue;
                }

                Db::name('config')->update($_data);

            }
            cache('conf',null);
            $this->success('编辑成功');
        }


    }

跟进file()函数

public function file($name = '')
    {
        if (empty($this->file)) {
            $this->file = isset($_FILES) ? $_FILES : [];
        }
        if (is_array($name)) {
            return $this->file = array_merge($this->file, $name);
        }
        $files = $this->file;
        if (!empty($files)) {
            // 处理上传文件
            $array = [];
            foreach ($files as $key => $file) {
                if (is_array($file['name'])) {
                    $item  = [];
                    $keys  = array_keys($file);
                    $count = count($file['name']);
                    for ($i = 0; $i < $count; $i++) {
                        if (empty($file['tmp_name'][$i]) || !is_file($file['tmp_name'][$i])) {
                            continue;
                        }
                        $temp['key'] = $key;
                        foreach ($keys as $_key) {
                            $temp[$_key] = $file[$_key][$i];
                        }
                        $item[] = (new File($temp['tmp_name']))->setUploadInfo($temp);
                    }
                    $array[$key] = $item;
                } else {
                    if ($file instanceof File) {
                        $array[$key] = $file;
                    } else {
                        if (empty($file['tmp_name']) || !is_file($file['tmp_name'])) {
                            continue;
                        }
                        $array[$key] = (new File($file['tmp_name']))->setUploadInfo($file);
                    }
                }
            }
            if (strpos($name, '.')) {
                list($name, $sub) = explode('.', $name);
            }
            if ('' === $name) {
                // 获取全部文件
                return $array;
            } elseif (isset($sub) && isset($array[$name][$sub])) {
                return $array[$name][$sub];
            } elseif (isset($array[$name])) {
                return $array[$name];
            }
        }
        return;
    }

可以看到处理上传文件并没有过滤，最终上传的文件move到/public/uploads/目录下。