CVE-2017-6919 : Exploit Details and Defense Strategies

Drupal 8 versions prior to 8.2.8 and 8.3 versions prior to 8.3.1 may be vulnerable to critical access bypass if the RESTful Web Services module is enabled.

Understanding CVE-2017-6919

If the site allows PATCH requests, authenticated users can exploit this vulnerability.

What is CVE-2017-6919?

Vulnerability in Drupal 8 versions before 8.2.8 and 8.3 before 8.3.1
Allows critical access bypass by authenticated users

The Impact of CVE-2017-6919

Potential unauthorized access to sensitive information
Risk of privilege escalation for authenticated users

Technical Details of CVE-2017-6919

Drupal versions before 8.2.8 and 8.3 before 8.3.1 are susceptible to critical access bypass.

Vulnerability Description

Exploitable if RESTful Web Services module is enabled
Site allows PATCH requests

Affected Systems and Versions

Drupal 8 versions prior to 8.2.8
Drupal 8.3 versions prior to 8.3.1

Exploitation Mechanism

Authenticated users can exploit the vulnerability

Mitigation and Prevention

Immediate Steps to Take:

Update Drupal to versions 8.2.8 or 8.3.1
Disable the RESTful Web Services module if not essential Long-Term Security Practices:
Regularly monitor and apply security updates
Conduct security audits to identify vulnerabilities
Implement least privilege access controls
Educate users on secure practices
Utilize web application firewalls
Employ intrusion detection and prevention systems
Backup critical data regularly
Stay informed about security best practices and trends
Engage in threat intelligence sharing
Consider penetration testing and security assessments

Patching and Updates

Apply security patches promptly
Stay informed about Drupal security advisories