CVE-2017-6923 : Security Advisory and Response

Drupal core before 8.3.7 allows an access bypass vulnerability in views when utilizing Ajax for updating information. Attackers can exploit this to access unauthorized content.

Understanding CVE-2017-6923

Drupal 8.x versions prior to 8.3.7 are affected by an access bypass vulnerability in views, potentially leading to unauthorized data access.

What is CVE-2017-6923?

In Drupal 8.x versions before 8.3.7, the views subsystem/module does not restrict access to the Ajax endpoint, allowing unauthorized access to information.
The vulnerability arises when Ajax is used to update displayed data through filter parameters.

The Impact of CVE-2017-6923

Attack Complexity: High
Attack Vector: Physical
Privileges Required: High
User Interaction: Required
Exploitation may lead to unauthorized access to sensitive data.

Technical Details of CVE-2017-6923

Drupal core vulnerability details and affected systems.

Vulnerability Description

The views subsystem/module in Drupal 8.x versions before 8.3.7 lacks proper access restrictions to the Ajax endpoint, enabling potential access bypass.

Affected Systems and Versions

Product: Drupal core
Vendor: Drupal
Versions Affected: 8.x (custom)
Versions Less Than: 8.3.7

Exploitation Mechanism

Attackers can exploit the vulnerability by utilizing Ajax for updating information in views, bypassing access restrictions.

Mitigation and Prevention

Protecting systems from CVE-2017-6923 and implementing security measures.

Immediate Steps to Take

Update Drupal core to version 8.3.7 or later to mitigate the vulnerability.
Apply access restrictions to all views, even when using other modules for display.

Long-Term Security Practices

Regularly monitor and audit access controls within Drupal installations.
Educate users on secure configuration practices to prevent unauthorized access.

Patching and Updates

Stay informed about security advisories and promptly apply patches to address known vulnerabilities.