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Hardening your Mule Installation

Mule Runtime Engine versions 3.5, 3.6, and 3.7 reached End of Life on or before January 25, 2020. For more information, contact your Customer Success Manager to determine how you can migrate to the latest Mule version.

As distinct from Security, hardening refers to the steps one must perform in order to bring an application from development into production. These are the hoops one must jump through in order to get something deployed in the IT space after development is completed.

Normally, an IT organization already has control of keeping open ports to a minimum, restricting access to administrative applications, minimizing the number of applications, and other housekeeping. Of course, the files used to configure Mule should be as secure as any configuration files.

Hardening Checklist

Here is a list of simple steps you can take to begin harden the Mule installation itself:

  • Run Mule as a Non-privileged User

  • Install Mule as a Service

  • Make sure to configure Mule to write logs or temporary files within appropriate locations. Configure logs, passwords, and keystore files

  • In some situations, you need to configure usernames, passwords, and keystores on Mule. Usually, these settings are made available externally, so that dev/ops can change these settings.

  • Manage certificates in a keystore file

  • Use a separate property file to store usernames and passwords and secure it using file system permissions

About Running Mule as Non-Privileged User

On Xnix, you can run Mule as any user with the following caveats:

  • You need write perms to logs directory

  • Without root you cannot use ports below 1024

On Windows, you need to be in admin user’s group to run Mule.

Hardening in Layers

By its nature, Mule can be situated in a variety of configurations. That said, the suggested approach to hardening involves hardening in layers beginning with the operating system, then working up the stack. The Center for Internet Security (CIS) publishes configuration benchmarks that are widely used in whole or in part as system hardening guides. Mule TCat Server also offers added security options.

Commercial configuration management and integrity management tools can help you automate management to the CIS benchmarks. Also, Mule documentation includes a good deal of information on configuring security. If your application deals in sensitive data, consider using SSL Transport (HTTPS) to protect it.

On the network security side, security experts recommend using a good stateful inspection network firewall with a default-deny rule set and exceptions only for justified business needs. Also, any internet facing server belongs in a DMZ with strong default-deny egress rules on the firewall to prevent data exfiltration. Furhermore, you can use a network IDS/IPS to monitor and prevent known attacks. Putting the database on an internal network - not the DMZ - also helps to harden your installation.

Be sure your software developers are familiar with secure web application coding techniques. At the very least, they should be familiar with best practices to avoid common web app pitfalls, such as those listed in OWASP’s top 10.

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