What does a phpshell look like?

After my last posting “(evil) Register Globals (on)“, I got an email asking what remote files look like and what they do. I call remote files “phpshells”. phpshells can send commands directly to the server system over http.

An easy version could be using a GET variable for a system call. Indeed, it’s enough to steal information, destroy pages and do other nasty stuff on a web server.

<?php
    system($_GET[‘cmd’]);
?>

The r57shell is the deluxe version of a phpshell. I added some pictures below. It’s an interface and has functions like ftp, mail and many more.

shell1

rshell4b

rshellftp.png

rshell2

rshell 3

rshell4a

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