CVE-2022-25277 : Vulnerability Insights and Analysis

Drupal core sanitizes filenames with dangerous extensions upon upload and strips leading and trailing dots from filenames to prevent uploading server configuration files. However, a vulnerability arises when protections for these two issues do not work correctly together, potentially allowing remote code execution on Apache web servers. This CVE affects Drupal Core versions 9.4 (prior to 9.4.3) and 9.3 (prior to 9.3.19).

Understanding CVE-2022-25277

This section delves into the details of the CVE-2022-25277 vulnerability.

What is CVE-2022-25277?

The vulnerability in Drupal Core allows for the upload of files with an htaccess extension without proper sanitization, potentially leading to remote code execution on Apache web servers.

The Impact of CVE-2022-25277

The vulnerability could result in an attacker bypassing Drupal core's protections and gaining unauthorized access, posing a risk of executing arbitrary PHP code.

Technical Details of CVE-2022-25277

This section explores the technical aspects of the CVE-2022-25277 vulnerability.

Vulnerability Description

The issue arises due to the incorrect interaction of filename sanitization protections in Drupal Core, potentially enabling the upload of malicious files.

Affected Systems and Versions

Drupal Core versions 9.4 (prior to 9.4.3) and 9.3 (prior to 9.3.19) are affected by this vulnerability.

Exploitation Mechanism

To exploit this vulnerability, a field administrator must explicitly configure a file field to allow htaccess as an extension, or use a contributed module or custom code to override file upload restrictions.

Mitigation and Prevention

This section provides guidance on mitigating and preventing the CVE-2022-25277 vulnerability.

Immediate Steps to Take

Administrators are advised to update Drupal Core to versions 9.4.3 or 9.3.19 to remediate the vulnerability.

Long-Term Security Practices

Regularly updating Drupal Core and monitoring for security advisories can help prevent future vulnerabilities.

Patching and Updates

Stay informed about security updates from Drupal Core and apply patches promptly to maintain a secure environment.