[UNIX] Digi-News and Digi-Ads Allow Gaining of Admin Privileges without Authentication

From: SecuriTeam (support_at_securiteam.com)
Date: 07/20/03

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    To: list@securiteam.com
Date: 20 Jul 2003 20:27:43 +0200

    The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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      Digi-News and Digi-Ads Allow Gaining of Admin Privileges without
    Authentication
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.digi-fx.net/freescripts.php> Digi-news is a "PHP news editor.
    It allows you to easily add, edit, and delete news".
    <http://www.digi-fx.net/freescripts.php> Digi-ad is a "PHP ad rotator. It
    allows you to easily add, edit, reset, and delete ads".

    A vulnerability in the product allows to access to the admin area in both
    script, without the need to know the administrator's password.

    DETAILS

    Vulnerable systems:
     * Digi-news version 1.1
     * Digi-ad version 1.1

    Immune systems:
     * Digi-news version 1.2
     * Digi-ad version 1.2

    In Digi-news and Digi-ad, the admin web page is accessed by requesting the
    admin.php file.

    The file contains the following authentication mechanism:

    if (!isset($action)) {
       $action = '';
    }
    if ($action == 'auth') {
       auth();
    }
    if ((@$HTTP_COOKIE_VARS['user'] != $digiNews['user']) &&
    (@$HTTP_COOKIE_VARS['pass'] != md5($digiNews['pass']))) {
       login();
       exit;
    }

    As you can see, the authentication scheme is based on cookies. This cookie
    contains the user and the MD5 hashed password.

    However, due to a programmatic mistake in this line:
    if ((@$HTTP_COOKIE_VARS['user'] != $digiNews['user']) &&
    (@$HTTP_COOKIE_VARS['pass'] != md5($digiNews['pass']))) {

    Someone is regarded as an administrator "user = user" or "password =
    password" in his cookie. To make it simple, you do not need to know the
    admin password, as far as you know the admin login name.

    The default admin login name is "admin".

    Workaround:
    The workaround is to replace the AND operation by a OR operation, as
    followed:
    if ((@$HTTP_COOKIE_VARS['user'] != $digiNews['user']) ||
    (@$HTTP_COOKIE_VARS['pass'] != md5($digiNews['pass']))) {

    Vendor Status:
    The vendor has been informed and solved the problems. Download
    <http://www.digi-fx.net/freescripts.php> Digi-News 1.2 and Digi-ads 1.2.

    ADDITIONAL INFORMATION

    Information supplied by <mailto:webmaster@securiteinfo.com> Arnaud
    Jacques a.k.a. scrap.

    ========================================

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    ====================
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