Create a file in your root directory
Code:
RewriteEngine On
DirectoryIndex index.html index.php
#option to remove directory listings in all folder (avoid publishing unwanted contents)
Options -Indexes
# URL Filtering helps stop some hack attempts
#IF the URI contains a "http:"
RewriteCond %{QUERY_STRING} http\: [OR]
#OR if the URI contains a "["
RewriteCond %{QUERY_STRING} \[ [OR]
#OR if the URI contains a "]"
RewriteCond %{QUERY_STRING} \] [OR]
#OR if the URI contains a "<script>"
RewriteCond %{QUERY_STRING} (\<|%3C).*script.*(\>|%3E) [NC,OR]
# Block out any script trying to base64_encode crap to send via URL
RewriteCond %{QUERY_STRING} base64_encode.*\(.*\) [OR]
#OR script trying to set a PHP GLOBALS variable via URL
RewriteCond %{QUERY_STRING} GLOBALS(=|\[|\%[0-9A-Z]{0,2}) [OR]
#OR any script trying to modify a _REQUEST variable via URL
RewriteCond %{QUERY_STRING} _REQUEST(=|\[|\%[0-9A-Z]{0,2}) [OR]
#IF the URI contains UNION
RewriteCond %{QUERY_STRING} UNION [OR]
#OR if the URI contains a *
RewriteCond %{QUERY_STRING} \*
#then deny the request (403)
RewriteRule ^.*$ - [F,L]
# End URL Filtering
