Open Social - Moderately critical - Access bypass - SA-CONTRIB-2021-001

Project: Open SocialVersion: 8.x-9.x-dev8.x-8.x-devDate: 2021-January-27Security risk: Moderately critical 12∕25 AC:Basic/A:None/CI:Some/II:None/E:Theoretical/TD:DefaultVulnerability: Access bypassDescription: The optional Social Auth Extra module enables you to use the single sign-on methods provided by Open Social e.g. Facebook, LinkedIn, Google and Twitter.
The module doesn't implement a proper cache strategy for anonymous users allowing the registration form to be cached with disclosed information in certain scenarios. The information is usually only available for logged-in users of the community.
This vulnerability is mitigated by the fact that social_auth_extra needs to be enabled, one of the single sign-on methods needs to be configured. There is no impact for regular registration without single sign-on.
Removing the single sign-on providers from configuration will allow this vulnerability to be blocked. Solution: Install the latest version:

• If you use Open Social major version 8, upgrade to 8.x-8.10
• If you use Open Social major version 9, upgrade to 8.x-9.8

Reported By: 

• Alexander Varwijk

Fixed By: 

• Alexander Varwijk
• Ronald te Brake

Coordinated By: 

• Greg Knaddison of the Drupal Security Team