Security Controls

PHP-2320 - PHP disabled functions


PHP enables system administrators to disable possible harmful functions. Depending on the software being used, many functions are not needed for proper functioning. An example of this would be the possibility to download a remote file via PHP, which is only needed in some applications.



How to solve

If you are hosting just one PHP based application, it may be useful to analyze the used functions and restrict all others posing risk. For example to open a remote file or socket.

Additional resources

Linux and Unix System Hardening

This information is provided as part of the Lynis community project. It is related to Lynis control PHP-2320. All information should be considered as-is, without guarantees. Any advice or snippets should be tested before implementing in production environments.


Lynis is a technical security audit tool for systems running Linux, UNIX, *BSD, and macOS. It is open source software and free to use. The project has an active community, and can also be found on GitHub.

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