Zero-Day Advisory

Fortinet Discovers Drupal SVG Sanitizer Module Denial Of Service Bypass Vulnerability

Summary

Fortinet's FortiGuard Labs has discovered a Denial Of Service vulnerability in SVG Sanitizer Module Drupal.

SVG Sanitizer module registers the SVG Sanitizer with Drupal's library api module. It also makes an SVG Sanitizer field formatter available for image (D7 only), SVG icon (D8 only) and file fields that will attempt to remove non-whitelisted SVG attributes and tags and display the contents of the SVG file.

A Denial Of Service vulnerability exists in the SVG Sanitizer module for Drupal from version 8.x to 1.0-alpha1 and below. Denial of service of user browser occurs upon successful exploitation of the vulnerability.

Solutions

FortiGuard Labs released the following FortiGate IPS signature which covers this specific vulnerability:

Drupal.Module.SVGSanitizer.DoS
Released Oct 28, 2019

Users should apply patch provided by SVG Sanitizer

Timeline

Fortinet reported the vulnerability to SVG Sanitizer on 26 September, 2019

SVG Sanitizer confirmed the vulnerability on 10 October, 2019

SVG Sanitizer released patch for the vulnerability on 5 November, 2019.

Acknowledgement

This vulnerability was discovered by Nguyen Thanh Nguyen of Fortinet's FortiGuard Labs.

IPS Subscription

Fortinet customers who subscribe to Fortinet's intrusion prevention (IPS) service should be protected against this vulnerability with the appropriate configuration parameters in place. Fortinet's IPS service is one component of FortiGuard Subscription Services, which also offer comprehensive solutions such as antivirus, Web content filtering and antispam capabilities. These services enable protection against threats on both application and network layers. FortiGuard Services are continuously updated by FortiGuard Labs, which enables Fortinet to deliver a combination of multi-layered security intelligence and true zero-day protection from new and emerging threats. These updates are delivered to all FortiGate, FortiMail and FortiClient products. Fortinet strictly follows responsible disclosure guidelines to ensure optimum protection during a threat's lifecycle.