Description:
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When a file is requested on a website by a user, it is normally done as follows:
http://127.0.0.1/somefile.php

During a review of logs, it was discovered that the same file can be called:
http://127.0.0.1/fcgi-php-fpm/somefile.php

Which confirms that FCGI is in use.

Furthermore, some misconfigurations may allow the user or an attacker to access files outside the document root as follows:
http://127.0.0.1/fcgi-php-fpm/home/v1234567890/html/somefile.php

Where "/home/v1234567890/html/" is an example of a shared hosting URL. (This was confirmed.)

Can you please look into this if it's an unknown bug or feature that you can't disable? (It looks like a feature.)

If it's a known feature that you can disable, is it possible to disable in the PHP FPM configuration files? And if so, how/where?


Version used: 5.4.4-14+deb7u5 
(Latest Debian version package)

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From manual page: http://www.php.net/install.fpm
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Test script:
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Please see description.

Expected result:
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When the "/fcgi-php-fpm/" path is included in the URL, and a PHP file executes as it should it is revealed that PHP FPM is in use even though all other headers and filenames may have been removed.

Furthermore, in some shared hosting cases, it is possible to access files below the "document root" for that user and possibly other users, depending on how severe an "access control misconfiguration" is.