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Bug #63904 open_basedir is not respected for .user.ini files
Submitted: 2013-01-04 16:01 UTC Modified: 2021-07-12 17:23 UTC
From: lekensteyn at gmail dot com Assigned:
Status: Open Package: Safe Mode/open_basedir
PHP Version: 5.4.10 OS: Linux
Private report: No CVE-ID: None
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 [2013-01-04 16:01 UTC] lekensteyn at gmail dot com 
Description:
------------
(this bug possibly applies to the CGI SAPI too, but I have not checked that.)

In a default configuration for PHP-FPM, the use of .user.ini files is enabled. This feature allows you to put .user.ini interleaved with PHP files.

There is a possibility to bypass open_basedir restrictions by using symlinks. For a given open_basedir = /foo/, a symlink /foo/.user.ini -> /bar/php.ini can be used to read the configuration of /bar/php.ini.

It does not look like a feature, at first I wanted to have a .user.ini just outside the webroot (e.g. web/.user.ini with DOCUMENT_ROOT web/public_html), but having the symlink defeats the advantage of putting it outside the webroot for privacy. (ignoring WWW server abilities to restrict access). Therefore, it must be a bug that open_basedir is not respected for .user.ini files.

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 [2021-07-12 15:39 UTC] cmb@php.net
-Type: Security +Type: Bug
 [2021-07-12 15:39 UTC] cmb@php.net 
open_basedir bypasses are not considered to be security issues;
cf. <https://externals.io/message/105606>
and <https://externals.io/message/115406>.
 
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