WordPress 3.9.2 is now available as a security release for all previous versions. We strongly encourage you to update your sites immediately.
This release fixes a possible denial of service issue in PHP’s XML processing, reported by Nir Goldshlager of the Salesforce.com Product Security Team. It was fixed by Michael Adams and Andrew Nacin of the WordPress security team and David Rothstein of the Drupal security team. This is the first time our two projects have coordinated joint security releases.
The WordPress Project: http://wordpress.org/news/2014/08/wordpress-3-9-2/
Drupal 6 and Drupal 7 include an XML-RPC endpoint which is publicly available (xmlrpc.php). The PHP XML parser used by this XML-RPC endpoint is vulnerable to an XML entity expansion attack and other related XML payload attacks which can cause CPU and memory exhaustion and the site’s database to reach the maximum number of open connections. Any of these may lead to the site becoming unavailable or unresponsive (denial of service).
All Drupal sites are vulnerable to this attack whether XML-RPC is used or not.
- If you use Drupal 7.x, upgrade to Drupal core 7.31.
- If you use Drupal 6.x, upgrade to Drupal core 6.33.
Drupal Security Advisory: https://www.drupal.org/SA-CORE-2014-004