Module: Msf::Exploit::Remote::MsSamr

Includes:
Auxiliary::Report, SMB::Client::Authenticated
Defined in:
lib/msf/core/exploit/remote/ms_samr.rb

Defined Under Namespace

Classes: ComputerInfo, MsSamrAuthenticationError, MsSamrBadConfigError, MsSamrConnectionError, MsSamrError, MsSamrNotFoundError, MsSamrUnexpectedReplyError, MsSamrUnknownError, SamrConnection

Constant Summary

Constants included from SMB::Client

SMB::Client::CONST, SMB::Client::DCERPCClient, SMB::Client::DCERPCPacket, SMB::Client::DCERPCResponse, SMB::Client::DCERPCUUID, SMB::Client::NDR, SMB::Client::SIMPLE, SMB::Client::XCEPT

Instance Attribute Summary

Attributes included from SMB::Client

#simple

Attributes included from Tcp

#sock

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Auxiliary::Report

#active_db?, #create_cracked_credential, #create_credential, #create_credential_and_login, #create_credential_login, #db, #db_warning_given?, #get_client, #get_host, #inside_workspace_boundary?, #invalidate_login, #mytask, #myworkspace, #myworkspace_id, #report_auth_info, #report_client, #report_exploit, #report_host, #report_loot, #report_note, #report_service, #report_vuln, #report_web_form, #report_web_page, #report_web_site, #report_web_vuln, #store_cred, #store_local, #store_loot

Methods included from Metasploit::Framework::Require

optionally, optionally_active_record_railtie, optionally_include_metasploit_credential_creation, #optionally_include_metasploit_credential_creation, optionally_require_metasploit_db_gem_engines

Methods included from Kerberos::ServiceAuthenticator::Options

#kerberos_auth_options

Methods included from Kerberos::Ticket::Storage

#kerberos_storage_options, #kerberos_ticket_storage, store_ccache

Methods included from SMB::Client

#connect, #domain, #domain_username_split, #smb_create, #smb_direct, #smb_enumprinters, #smb_enumprintproviders, #smb_file_exist?, #smb_file_rm, #smb_fingerprint, #smb_fingerprint_windows_lang, #smb_fingerprint_windows_sp, #smb_hostname, #smb_lanman_netshareenumall, #smb_login, #smb_lookup_share_type, #smb_netshareenumall, #smb_netsharegetinfo, #smb_open, #smb_peer_lm, #smb_peer_os, #smb_srvsvc_netshareenumall, #smb_srvsvc_netsharegetinfo, #smbhost, #splitname, #unicode

Methods included from Tcp

#chost, #cleanup, #connect, #connect_timeout, #cport, #disconnect, #handler, #lhost, #lport, #peer, #print_prefix, #proxies, #rhost, #rport, #set_tcp_evasions, #shutdown, #ssl, #ssl_cipher, #ssl_verify_mode, #ssl_version

Class Method Details

.connect_ipc ⇒ Object 



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# File 'lib/msf/core/exploit/remote/ms_samr.rb', line 165

def connect_ipc
  begin
    connect
  rescue Rex::ConnectionError => e
    raise MsSamrConnectionError, e.message
  end

  begin
    
  rescue Rex::Proto::SMB::Exceptions::Error, RubySMB::Error::RubySMBError => e
    raise MsSamrAuthenticationError, "Unable to authenticate ([#{e.class}] #{e})."
  end
  report_service(
    host: rhost,
    port: rport,
    host_name: simple.client.default_name,
    proto: 'tcp',
    name: 'smb',
    info: "Module: #{fullname}, last negotiated version: SMBv#{simple.client.negotiated_smb_version} (dialect = #{simple.client.dialect})"
  )

  begin
    simple.client.tree_connect("\\\\#{sock.peerhost}\\IPC$")
  rescue RubySMB::Error::RubySMBError => e
    raise MsSamrConnectionError, "Unable to connect to the remote IPC$ share ([#{e.class}] #{e})."
  end
end

.connect_samr(tree) ⇒ Object 



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# File 'lib/msf/core/exploit/remote/ms_samr.rb', line 193

def connect_samr(tree)
  begin
    vprint_status('Connecting to Security Account Manager (SAM) Remote Protocol')
    samr = tree.open_file(filename: 'samr', write: true, read: true)

    vprint_status('Binding to \\samr...')
    samr.bind(endpoint: RubySMB::Dcerpc::Samr)
    vprint_good('Bound to \\samr')
    server_handle = samr.samr_connect
  rescue RubySMB::Dcerpc::Error::FaultError => e
    elog(e.message, error: e)
    raise MsSamrUnexpectedReplyError, "Connection failed (DCERPC fault: #{e.status_name})"
  end

  if datastore['SMBDomain'].blank? || datastore['SMBDomain'] == '.'
    all_domains = samr.samr_enumerate_domains_in_sam_server(server_handle: server_handle).map(&:to_s).map(&:encode)
    all_domains.delete('Builtin')
    if all_domains.empty?
      raise MsSamrNotFoundError, 'No domains were found on the SAM server.'
    elsif all_domains.length > 1
      print_status("Enumerated domains: #{all_domains.join(', ')}")
      raise MsSamrBadConfigError, 'The SAM server has more than one domain, the target must be specified.'
    end

    domain_name = all_domains.first
    print_status("Using automatically identified domain: #{domain_name}")
  else
    domain_name = datastore['SMBDomain']
  end

  domain_sid = samr.samr_lookup_domain(server_handle: server_handle, name: domain_name)
  domain_handle = samr.samr_open_domain(server_handle: server_handle, domain_id: domain_sid)

  SamrConnection.new(samr, server_handle, domain_handle, domain_name)

rescue RubySMB::Dcerpc::Error::DcerpcError => e
  elog(e.message, error: e)
  raise MsSamrUnexpectedReplyError, e.message
rescue RubySMB::Error::RubySMBError
  elog(e.message, error: e)
  raise MsSamrUnknownError, e.message
end

.get_computer_sid(samr_con, computer_name) ⇒ Object

Raises:



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# File 'lib/msf/core/exploit/remote/ms_samr.rb', line 269

def get_computer_sid(samr_con, computer_name)
  details = samr_con.samr.samr_lookup_names_in_domain(
    domain_handle: samr_con.domain_handle,
    names: [ computer_name ]
  )
  raise MsSamrNotFoundError, 'The computer was not found.' if details.nil?

  details = details[computer_name]
  samr_con.samr.samr_rid_to_sid(
    object_handle: samr_con.domain_handle,
    rid: details[:rid]
  ).to_s
end

.random_hostname(prefix: 'DESKTOP') ⇒ Object 



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# File 'lib/msf/core/exploit/remote/ms_samr.rb', line 236

def random_hostname(prefix: 'DESKTOP')
  "#{prefix}-#{Rex::Text.rand_base(8, '', ('A'..'Z').to_a + ('0'..'9').to_a)}$"
end

.report_creds(domain, username, password) ⇒ Object 



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# File 'lib/msf/core/exploit/remote/ms_samr.rb', line 240

def report_creds(domain, username, password)
  service_data = {
    address: datastore['RHOST'],
    port: datastore['RPORT'],
    service_name: 'smb',
    protocol: 'tcp',
    workspace_id: myworkspace_id
  }

  credential_data = {
    module_fullname: fullname,
    origin_type: :service,
    private_data: password,
    private_type: :password,
    username: username,
    realm_key: Metasploit::Model::Realm::Key::ACTIVE_DIRECTORY_DOMAIN,
    realm_value: domain
  }.merge(service_data)

  credential_core = create_credential(credential_data)

   = {
    core: credential_core,
    status: Metasploit::Model::Login::Status::UNTRIED
  }.merge(service_data)

  ()
end

Instance Method Details

#add_computer(opts = {}) ⇒ Object 



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# File 'lib/msf/core/exploit/remote/ms_samr.rb', line 34

def add_computer(opts = {})
  tree = opts[:tree] || connect_ipc

  samr_con = connect_samr(tree)

  computer_name = opts[:computer_name] || datastore['COMPUTER_NAME']
  if computer_name.blank?
    computer_name = random_hostname
    4.downto(0) do |attempt|
      break if samr_con.samr.samr_lookup_names_in_domain(
        domain_handle: samr_con.domain_handle,
        names: [ computer_name ]
      ).nil?

      computer_name = random_hostname
      raise MsSamrBadConfigError, 'Could not find an unused computer name.' if attempt == 0
    end
  else
    if samr_con.samr.samr_lookup_names_in_domain(domain_handle: samr_con.domain_handle, names: [ computer_name ])
      raise MsSamrBadConfigError, 'The specified computer name already exists.'
    end
  end

  result = samr_con.samr.samr_create_user2_in_domain(
    domain_handle: samr_con.domain_handle,
    name: computer_name,
    account_type: RubySMB::Dcerpc::Samr::USER_WORKSTATION_TRUST_ACCOUNT,
    desired_access: RubySMB::Dcerpc::Samr::USER_FORCE_PASSWORD_CHANGE | RubySMB::Dcerpc::Samr::MAXIMUM_ALLOWED
  )

  user_handle = result[:user_handle]
  if datastore['COMPUTER_PASSWORD'].blank?
    computer_password = Rex::Text.rand_text_alphanumeric(32)
  else
    computer_password = datastore['COMPUTER_PASSWORD']
  end

   = RubySMB::Dcerpc::Samr::SamprUserInfoBuffer.new(
    tag: RubySMB::Dcerpc::Samr::USER_INTERNAL4_INFORMATION_NEW,
    member: RubySMB::Dcerpc::Samr::SamprUserInternal4InformationNew.new(
      i1: {
        password_expired: 1,
        which_fields: RubySMB::Dcerpc::Samr::USER_ALL_NTPASSWORDPRESENT | RubySMB::Dcerpc::Samr::USER_ALL_PASSWORDEXPIRED
      },
      user_password: {
        buffer: RubySMB::Dcerpc::Samr::SamprEncryptedUserPasswordNew.encrypt_password(
          computer_password,
          @simple.client.application_key
        )
      }
    )
  )
  samr_con[:samr].samr_set_information_user2(
    user_handle: user_handle,
    user_info: 
  )

   = RubySMB::Dcerpc::Samr::SamprUserInfoBuffer.new(
    tag: RubySMB::Dcerpc::Samr::USER_CONTROL_INFORMATION,
    member: RubySMB::Dcerpc::Samr::UserControlInformation.new(
      user_account_control: RubySMB::Dcerpc::Samr::USER_WORKSTATION_TRUST_ACCOUNT
    )
  )
  samr_con.samr.samr_set_information_user2(
    user_handle: user_handle,
    user_info: 
  )
  print_good("Successfully created #{samr_con.domain_name}\\#{computer_name}")
  print_good("  Password: #{computer_password}")
  print_good("  SID:      #{get_computer_sid(samr_con, computer_name)}")
  report_creds(samr_con.domain_name, computer_name, computer_password)

  ComputerInfo.new(computer_name, computer_password)

rescue RubySMB::Dcerpc::Error::SamrError => e
  raise MsSamrUnknownError, "A DCERPC SAMR error occurred: #{e.message}"
ensure
  if samr_con
    samr_con.samr.close_handle(user_handle) if user_handle
    samr_con.samr.close_handle(samr_con.domain_handle) if samr_con.domain_handle
    samr_con.samr.close_handle(samr_con.server_handle) if samr_con.server_handle
  end
end

#delete_computer(opts = {}) ⇒ Object 



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# File 'lib/msf/core/exploit/remote/ms_samr.rb', line 118

def delete_computer(opts = {})
  tree = opts[:tree] || connect_ipc

  samr_con = connect_samr(tree)

  computer_name = opts[:computer_name] || datastore['COMPUTER_NAME']
  if computer_name.blank?
    raise MsSamrBadConfigError, 'Unable to delete the computer account since its name is unknown'
  end

  details = samr_con.samr.samr_lookup_names_in_domain(domain_handle: samr_con.domain_handle, names: [ computer_name ])
  raise MsSamrBadConfigError, 'The specified computer was not found.' if details.nil?
  details = details[computer_name]

  user_handle = samr_con.samr.samr_open_user(domain_handle: samr_con.domain_handle, user_id: details[:rid])
  samr_con.samr.samr_delete_user(user_handle: user_handle)
  print_good('The specified computer has been deleted.')
rescue RubySMB::Dcerpc::Error::SamrError => e
  # `user_handle` only needs to be closed if an error occurs in `samr_delete_user`
  # If this method succeed, the server took care of closing the handle
  samr_con.samr.close_handle(user_handle) if user_handle
  raise MsSamrUnknownError, "Could not delete the computer #{computer_name}: #{e.message}"
ensure
  samr_con.samr.close_handle(samr_con.domain_handle) if samr_con.domain_handle
  samr_con.samr.close_handle(samr_con.server_handle) if samr_con.server_handle
end

#initialize(info = {}) ⇒ Object 



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# File 'lib/msf/core/exploit/remote/ms_samr.rb', line 25

def initialize(info = {})
  super

  register_options([
    OptString.new('COMPUTER_NAME', [ false, 'The computer name' ]),
    OptString.new('COMPUTER_PASSWORD', [ false, 'The password for the new computer' ]),
  ], Msf::Exploit::Remote::MsSamr)
end

#lookup_computer(opts = {}) ⇒ Object 



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# File 'lib/msf/core/exploit/remote/ms_samr.rb', line 145

def lookup_computer(opts = {})
  tree = opts[:tree] || connect_ipc

  samr_con = connect_samr(tree)

  computer_name = opts[:computer_name] || datastore['COMPUTER_NAME']
  if computer_name.blank?
    raise MsSamrBadConfigError, 'Unable to lookup the computer account since its name is unknown'
  end

  sid = get_computer_sid(samr_con, computer_name)
  print_good("Found #{samr_con.domain_name}\\#{computer_name} (SID: #{sid})")
ensure
  samr_con.samr.close_handle(samr_con.domain_handle) if samr_con.domain_handle
  samr_con.samr.close_handle(samr_con.server_handle) if samr_con.server_handle
end