SA-CONTRIB-2013-096 - Entity reference - Access bypass

By default, with an autoselect or a select widget, a user cannot autocomplete an entity title, nor can they select an entity that they have no access to. This will correctly throw a ‘invalid id’ error and does not show the title of the entity.

However, if a user (A) that has access to the referenced entity (Node 1), makes that reference on a node (Node 2), and gives edit access to another user (B), user B will be able to see the node title for the referenced node (Node 2).

This vulnerability is mitigated by the fact that an attacker must get a user with access to a private node to reference it via another node that attacker has edit access to. No other node information is leaked other than the title.

CVE identifier(s) issued

• CVE-2013-7066

Versions affected

• Entityreference 7.x-1.x versions prior to 7.x-1.1-rc1

Drupal core is not affected. If you do not use the contributed Entity reference module, there is nothing you need to do.

Solution

Install the latest version:

• If you use the Entityreference module for Drupal 7.x, upgrade to Entityreference 7.x-1.1

Also see the Entity reference project page.

Reported by

• Jakob Perry

Fixed by

• Damien Tournoud the module maintainer
• Jakob Perry
• Amitai Burstein

Coordinated by

• David Stoline and Greg Knaddison of the Drupal Security Team