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                                    CERT-Renater

                         Note d'Information No. 2008/VULN128
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DATE                      : 10/04/2008

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Systems running Drupal versions 6.x.

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http://drupal.org/node/244637
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- ------------SA-2008-026 -------------

   * Advisory ID: DRUPAL-SA-2008-026

   * Project: Drupal core

   * Version: 6.x

   * Date: 2008-April-09

   * Security risk: Moderately critical

   * Exploitable from: Remote

   * Vulnerability: Access bypass

- ------------DESCRIPTION------------

The menu system routes page requests to appropriate handlers. It also
determines whether a user has access to pages based on several criteria, 
such as
permissions assigned to a role. Drupal 6 features an entirely revised menu
system, including changes to the way access is dealt with, which if not 
properly
understood by developers can lead to vulnerabilities. This security release
provides a more secure access behaviour by default, and fixes 
incorrectly set
menu items in Drupal core.

Access to some pages was not appropriately controlled:

   * Any user can edit profile pages of other users.

   * Users who can view administration pages are able to edit content types.

   * The tracker and blog pages expose information to users without the 
"access
content" permission.

- ------------VERSIONS AFFECTED------------

   * Drupal 6.x before version 6.2.

- ------------SOLUTION------------

Install the latest version:

   * If you are running Drupal 6.x then upgrade to Drupal 6.2 [
http://ftp.drupal.org/files/projects/drupal-6.2.tar.gz ].

If you are unable to upgrade immediately, you can apply a patch to 
secure your
installation until you are able to do a proper upgrade. The patch fixes
incorrectly set menu items in Drupal core, but does not contain the menu API
change which would provide secure defaults. This patch is a temporary 
solution
to be used if modules are required which are still incompatible with the 
new API
changes.

   * To patch Drupal 6.1 use SA-2008-026-6.1.patch [
http://drupal.org/files/sa-2008-026/SA-2008-026-6.1.patch ].

IMPORTANT NOTES

It is essential to follow this process when updating:

   * First make sure that you are logged in as user number 1 or that 
your site's
settings.php has $update_free_access = TRUE; so that anyone can access the
update.php script while you update the site. We suggest you log in as user 1
because you might have difficulties in gaining write access to your settings
file.

   * Turn your site into offline mode.

   * Then, and only then replace your Drupal source code files with the 
new ones
from Drupal 6.2.

   * Run update.php.

   * Turn your site back to online mode.

   * If you edited your site's settings.php, make sure to set
$update_free_access = FALSE;

If you do not follow the above procedure, and just replace the source files,
any attempt to access the site will be greeted with the message: "Fatal 
error:
Call to undefined function user_uid_optional_to_arg() in 
includes/menu.inc on
line 594" and you will have no way to set the site to offline mode on 
the web
interface until you get through update.php.

Contributed modules may require an update to work properly with Drupal 6.2.
Failing to update modules will lead to some pages of the affected 
modules not
being accessible.

- ------------NOTE FOR MODULE DEVELOPERS------------

Drupal 6.2 contains two API changes.

   * Menu access callbacks are no longer inherited from parent items.

   * %user_current has been renamed to %user_uid_optional.

Additional information can be found in Updating your 6.x module to work with
6.2 [ http://drupal.org/node/244569 ].

- ------------REPORTED BY------------

   * The tracker and profile access issue were respectively reported by 
Peter
Wolanin and Greg Knaddison of the Drupal security team.

- ------------CONTACT------------

The security contact for Drupal can be reached at security at drupal.org 
or via
the form at [ http://drupal.org/contact ].

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