View online: https://drupal.org/node/2059765

  * Advisory ID: DRUPAL-SA-CONTRIB-2013-065
  * Project: Organic groups [1] (third-party module)
  * Version: 7.x
  * Date: 2013-August-07
  * Security risk: Critical [2]
  * Exploitable from: Remote
  * Vulnerability: Access bypass, Multiple vulnerabilities

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

This module enables users to create and manage their own 'groups'. Each group
can have subscribers, and maintains a group home page where subscribers
communicate amongst themselves.

The module allows any authenticated user to guess the node ID of private
groups, and subscribe to them without approval, thus being able to see their
content.
This vulnerability is mitigated by the fact that the permissions to subscribe
are set to allow without approval.

Furthermore, misconfiguration of the OG access fields (a.k.a visibility
fields) could have lead to nodes not being private even though a site admin
would expect them to be private, due to the group default setting.
This vulnerability is mitigated by requiring a non-default configuration
where the "Group visibility" field was not attached to the group node, and
only the "Group content visibility" was attached to the group-content node.


-------- CVE IDENTIFIER(S) ISSUED  
--------------------------------------------

  * /A CVE identifier [3] will be requested, and added upon issuance, in
    accordance with Drupal Security Team processes./

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

  * OG 7.x-2.x versions prior to 7.x-2.3.

Drupal core is not affected. If you do not use the contributed Organic groups
[4] module, there is nothing you need to do.

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

Install the latest version:

  * If you use the Organic groups module for Drupal 7.x, upgrade to OG 7.x-2.3
    [5]

Also see the Organic groups [6] project page.

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

  * Nic Ivy [7]
  * Hunter Fox [8] of the Drupal Security Team

-------- FIXED BY  
------------------------------------------------------------

  * Amitai Burstein [9] the module maintainer
  * Roy Segall [10] from Gizra
  * Hunter Fox [11] of the Drupal Security Team

-------- COORDINATED BY  
------------------------------------------------------

  * Hunter Fox [12] of the Drupal Security Team
  * David Stoline [13] of the Drupal Security Team

-------- CONTACT AND MORE INFORMATION  
----------------------------------------

The Drupal security team can be reached at security at drupal.org or via the
contact form at http://drupal.org/contact [14].

Learn more about the Drupal Security team and their policies [15], writing
secure code for Drupal [16], and securing your site [17].


[1] http://drupal.org/project/og
[2] http://drupal.org/security-team/risk-levels
[3] http://cve.mitre.org/
[4] http://drupal.org/project/og
[5] https://drupal.org/node/2059755
[6] http://drupal.org/project/og
[7] https://drupal.org/user/6194
[8] https://drupal.org/user/426416
[9] https://drupal.org/user/57511
[10] https://drupal.org/user/1812910
[11] https://drupal.org/user/426416
[12] https://drupal.org/user/426416
[13] https://drupal.org/user/329570
[14] http://drupal.org/contact
[15] http://drupal.org/security-team
[16] http://drupal.org/writing-secure-code
[17] http://drupal.org/security/secure-configuration