Drupal Booking and Availability Management Tools Module Access Bypass Vulnerability



Date Discovered

October 16, 2019


The Booking and Availability Management Tools (BAT) module for Drupal is prone to an access-bypass vulnerability. Attackers can leverage this issue to bypass security restrictions and perform unauthorized actions; this may aid in launching further attacks. Booking and Availability Management Tools module 8.x versions are vulnerable.

Technologies Affected

  • Drupal Bat 8.x-1.0
  • Drupal Bat 8.x-1.1


Block external access at the network boundary, unless external parties require service.
Filter access to the affected computer at the network boundary if global access isn't needed. Restricting access to only trusted computers and networks might greatly reduce the likelihood of a successful exploit.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to detect and block attacks and anomalous activity such as requests containing suspicious URI sequences. Since the webserver may log such requests, review its logs regularly.

Do not use client software to communicate with untrusted sources.
To reduce the likelihood of exploits, connect to only trusted hosts and servers.

Updates are available. Please see the references or vendor advisory for more information.



Jelle Sebreghts

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