The Drupal CMS team has released a security update to address a critical severity access bypass vulnerability in the CMS’ core component that could allow attackers to take control of impacted sites.

Only a limited set of websites running on the Drupal CMS are affected according to the security advisory given that the security issue only affects the Drupal 8.7.4 version, with Drupal 8.7.3 and earlier, Drupal 8.6.x and earlier, and Drupal 7.x not being affected.

“In Drupal 8.7.4, when the experimental Workspaces module is enabled, an access bypass condition is created,” says the Drupal team.

Drupal 8.7.5 patches the access bypass vulnerability

The Drupal 8.7.5 release was issued today to fix the access bypass bug tracked as CVE-2019-6342, thus allowing admins to quickly patch their servers to protect them from potential attacks.

More importantly, according to the Drupal development team, the fix will ONLY be applied for affected websites where update.php is running — this is a required manual step when upgrading to Drupal 8.7.5.

Updating to the 8.7.5 is very important given that attackers could leverage the vulnerability by visiting an URL and no registration or authentication level is required to abuse the impacted websites.

Luckily, an exploit for this vulnerability is not yet available, however, in the event that one will be developed most sites running on Drupal 8.7.4 will be exposed to attacks given that “default or common module configurations are exploitable.”

Mitigation measures available

Mitigation measures are also available for admins who cannot immediately update the Drupal installation on their servers, with the simplest way to do it being the disabling of the Workspaces module for affected sites.

Department of Homeland Security’s Cybersecurity and Infrastructure Security Agency (CISA) also issued an alert urging Drupal administrators and users to upgrade to the patched Drupal 8.7.5 version.

At the moment, approximately 290,958 websites are using Drupal 8.x out of a total of 1,093,220 according to official numbers available on the “Usage statistics for Drupal core” page.

“These statistics are incomplete; only Drupal websites using the Update Status module are included in the data. This module has been included with the download of Drupal since version 6.x so the data does not include older sites,” Drupal adds.

Additionally, Drupal is used by 1.8% of all websites with content management systems (CMS) tracked by W3Techs, making it the third most popular CMS on the Internet, after WordPress (34.2%) and Joomla (2.8%).

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