SA-CONTRIB-2013-062 - RESTful Web Services (RESTWS) - Access Bypass

This module enables you to expose Drupal entities as RESTful web services. It provides a machine-readable interface to exchange resources in JSON, XML and RDF.

The module doesn’t sufficiently check for field level access when preforming entity write operations on POST and PUT requests. It also does not check the allowed filter formats for a user for formatted text fields, thereby allowing an attacker to exploit XSS with a format that displays full HTML or even PHP code execution with a PHP code format.

This vulnerability is mitigated by the fact that an attacker must have a role with a RESTWS permission such as “access resource node” and a permission to write entities such as “create page content”. PHP code execution is only possible if the PHP module is enabled.

CVE identifier(s) issued

• CVE-2013-4225

Versions affected

• RESTWS 7.x-1.x versions prior to 7.x-1.4.
• RESTWS 7.x-2.x versions prior to 7.x-2.1.

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

Solution

Install the latest version:

• If you use the RESTWS 1.x module for Drupal 7.x, upgrade to RESTWS 7.x-1.4
• If you use the RESTWS 2.x module for Drupal 7.x, upgrade to RESTWS 7.x-2.1

Also see the RESTful Web Services project page.

Reported by

• Chris Oden

Fixed by

• Klaus Purer the module maintainer
• Chris Oden

Coordinated by

• Klaus Purer of the Drupal Security Team