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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::Exploit::Remote::Udp
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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' => 'Citrix MetaFrame ICA Published Applications Scanner',
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        'Description' => %q{
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          This module attempts to query Citrix Metaframe ICA server to obtain
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          a published list of applications.
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        },
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        'Author' => [ 'aushack' ],
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        'References' => [
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          [ 'URL', 'http://www.securiteam.com/exploits/5CP0B1F80S.html' ],
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        ],
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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(1604),
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      ]
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    )
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  end
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  def autofilter
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    false
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  end
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  def run
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    connect_udp
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    print_status("Attempting to contact Citrix ICA service...")
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    client_connect =
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      "\x20\x00\x01\x30\x02\xfd\xa8\xe3\x00\x00\x00\x00\x00\x00\x00\x00" +
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      "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
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    # Server hello response
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    server_response =
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      "\x30\x00\x02\x31\x02\xfd\xa8\xe3\x02\x00\x06\x44"
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    udp_sock.put(client_connect)
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    res = udp_sock.get(3)
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    if (res[0, server_response.length] == server_response)
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      print_status("Citrix MetaFrame ICA server detected. Requesting Published Applications list...")
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      find_published =
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        "\x2a\x00\x01\x32\x02\xfd\xa8\xe3\x00\x00\x00\x00\x00\x00\x00\x00" +
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        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x21\x00\x02\x00" +
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        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
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      server_list_pre =
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        "\xea\x00\x04\x33\x02\xfd\xa8\xe3\x02\x00\x06\x44\xac\x1f\x03\x1f" +
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        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00" +
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        "\x0b\x00\x28\x00\x00\x00\x00\x00"
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      udp_sock.put(find_published)
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      res = udp_sock.get(3)
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      if (res.index(server_list_pre) == 0) # good packet, with following data
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        print_status("Citrix Applications Reported:\r\n" + res[server_list_pre.length, res.length].gsub("\x00", "\r\n"))
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      end
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    else
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      print_error("Citrix did not report any Published Applications. Try the brute force module instead.")
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    end
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    disconnect_udp
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  end
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end
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