SA-CONTRIB-2013-042 - RESTful Web Services (RESTWS) - Denial of Service

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 interferes with Drupal’s page cache and allows an attacker to poison the cache with non-HTML page responses, thereby exposing a denial of service vulnerability.

This vulnerability is mitigated by the fact that page caching must be enabled and the anonymous user role must be assigned a RESTWS permission, for example “access resource node”.

CVE identifier(s) issued

• CVE-2013-1946

Versions affected

• RESTWS 7.x-1.x versions prior to 7.x-1.3.
• RESTWS 7.x-2.x versions prior to 7.x-2.0-alpha5.

Drupal core is not affected. If you do not use the contributed RESTful Web Services 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-1.3
• If you use the RESTWS 2.x module for Drupal 7.x, upgrade to RESTWS 7.x-2.0-alpha5

Also see the RESTful Web Services project page.

Reported by

• Dylan Tack of the Drupal Security Team

Fixed by

• Klaus Purer the module maintainer
• Stéphane Corlosquet of the Drupal Security Team

Coordinated by

• Klaus Purer of the Drupal Security Team