CVE-2025-31694
📋 TL;DR
This vulnerability in Drupal's Two-factor Authentication (TFA) module allows attackers to bypass 2FA through forceful browsing techniques. It affects all Drupal sites using TFA module versions before 1.10.0. Attackers can potentially access protected areas without completing the second authentication factor.
💻 Affected Systems
- Drupal Two-factor Authentication (TFA) module
📦 What is this software?
Two Factor Authentication by Two Factor Authentication Project
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain administrative access to Drupal sites, leading to complete system compromise, data theft, or site defacement.
Likely Case
Attackers bypass 2FA to access user accounts with elevated privileges, potentially modifying content or accessing sensitive data.
If Mitigated
With proper network segmentation and monitoring, impact is limited to unauthorized access to specific protected areas.
🎯 Exploit Status
Requires authenticated access to attempt forceful browsing. Attackers need valid credentials for the first authentication factor.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.10.0
Vendor Advisory: https://www.drupal.org/sa-contrib-2025-023
Restart Required: No
Instructions:
1. Update TFA module to version 1.10.0 via Drupal's update manager. 2. Clear Drupal cache. 3. Verify module update completed successfully.
🔧 Temporary Workarounds
Disable TFA module
allTemporarily disable the vulnerable module until patching is possible
drush pm-disable tfa
Implement additional access controls
allAdd IP restrictions or additional authentication layers to protected areas
🧯 If You Can't Patch
- Implement network segmentation to isolate Drupal servers
- Enable detailed logging and monitoring for authentication bypass attempts
🔍 How to Verify
Check if Vulnerable:
Check TFA module version in Drupal admin at /admin/modules or using drush: drush pm-list | grep tfaCheck Version:
drush pml --type=module --status=enabled --fields=name,version | grep tfaVerify Fix Applied:
Confirm TFA module version is 1.10.0 or higher and test 2FA workflow📡 Detection & Monitoring
Log Indicators:
- Failed 2FA attempts followed by successful access to protected pages
- Access to admin pages without 2FA completion logs
Network Indicators:
- Unusual access patterns to protected URLs without proper authentication sequence
SIEM Query:
source="drupal_access_log" AND (uri_path="/admin/*" OR uri_path="/user/*") AND NOT auth_method="tfa"