CVE-2017-6924 : Exploit Details and Defense Strategies

In versions of Drupal 8 earlier than 8.3.7, a vulnerability related to the REST API allows unauthorized users to submit comments that are approved without proper permissions.

Understanding CVE-2017-6924

This CVE involves an access bypass issue in Drupal Core affecting versions prior to 8.3.7.

What is CVE-2017-6924?

The vulnerability allows users without necessary permissions to post comments through the REST API, leading to unauthorized comment approvals.
It specifically impacts websites with the RESTful Web Services module and comment entity REST resource enabled.
Attackers can exploit this issue if they gain access to a user account with comment posting permissions or if anonymous users can post comments.

The Impact of CVE-2017-6924

CVSS Score: 0 (None)
Severity: Moderately Critical
Attack Complexity: High
Privileges Required: High
User Interaction: Required
Attack Vector: Physical

Technical Details of CVE-2017-6924

This section provides detailed technical information about the vulnerability.

Vulnerability Description

Users without correct permissions can post comments via REST, bypassing approval requirements.

Affected Systems and Versions

Affected Product: Drupal Core
Vendor: Drupal
Affected Version: Drupal 8 < 8.3.7

Exploitation Mechanism

Requires access to a user account with comment posting permissions or allowance for anonymous users to post comments.

Mitigation and Prevention

Protect your systems from CVE-2017-6924 with these mitigation strategies.

Immediate Steps to Take

Update Drupal Core to version 8.3.7 or later to patch the vulnerability.
Disable the RESTful Web Services module if not essential for site functionality.

Long-Term Security Practices

Regularly monitor and audit user permissions and access controls.
Educate users on secure practices to prevent unauthorized actions.

Patching and Updates

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