CVE-2020-13671 Explained : Impact and Mitigation

Drupal core vulnerability affecting versions prior to 9.0.8, 8.9.9, 8.8.11, and 7.74.

Understanding CVE-2020-13671

A vulnerability in Drupal Core that could lead to remote code execution.

What is CVE-2020-13671?

Drupal Core fails to properly sanitize filenames on uploaded files, potentially causing them to be misinterpreted, leading to incorrect file extensions, MIME types, or PHP execution in specific hosting setups.

The Impact of CVE-2020-13671

The vulnerability allows attackers to execute remote code on affected Drupal installations, posing a significant security risk.

Technical Details of CVE-2020-13671

The specifics of the vulnerability and its implications.

Vulnerability Description

Improper file sanitization in Drupal Core
Risk of incorrect file interpretation and execution

Affected Systems and Versions

Drupal Core 9.0 versions prior to 9.0.8
Drupal Core 8.9 versions prior to 8.9.9
Drupal Core 8.8 versions prior to 8.8.11
Drupal Core 7 versions prior to 7.74

Exploitation Mechanism

Uploading malicious files with manipulated filenames
Leveraging the incorrect file handling to execute code

Mitigation and Prevention

Steps to address and prevent the CVE-2020-13671 vulnerability.

Immediate Steps to Take

Update Drupal Core to versions 9.0.8, 8.9.9, 8.8.11, or 7.74
Review and restrict file upload permissions
Monitor file extensions and MIME types

Long-Term Security Practices

Regularly update Drupal Core and plugins
Implement file upload security best practices
Conduct security audits and penetration testing

Patching and Updates

Apply security patches promptly
Stay informed about Drupal security advisories