SA-CONTRIB-2012-158 - MailChimp - Cross Site Scripting (XSS)

This module provides integration with the MailChimp email delivery service.

There are two issues with the webhook processing, which is exposed as an API in mailchimp.module and used by mailchimp_lists.module to update subscriber information.

• The webhook URL key can be trivially calculated.
• Webhook variables from POST requests are not properly sanitized.

Mitigating these issues is the fact that attackers cannot tamper with email subscriptions even if they know the webhook path, because changes are pulled in from the MailChimp API only.

CVE: CVE-2012-5551

Versions affected

• MailChimp 7.x-2.x versions prior to 7.x-2.7.

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

Solution

Install the latest version:

• If you use the MailChimp module for Drupal 7.x, upgrade to MailChimp 7.x-2.7

Also see the MailChimp project page.

Reported by

• Dmitriy Trt (Dmitriy.trt)

Fixed by

• Lev Tsypin (levelos) the module maintainer

Coordinated by

• Klaus Purer (klausi) of the Drupal Security Team