CVE-2024-13239
📋 TL;DR
A weak authentication vulnerability in Drupal's Two-factor Authentication (TFA) module allows attackers to bypass 2FA protections and gain unauthorized access. This affects all Drupal sites using the TFA module with vulnerable versions. Attackers can abuse authentication mechanisms to compromise user accounts.
💻 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, defacement, or ransomware deployment.
Likely Case
Attackers bypass 2FA to access user accounts, potentially escalating privileges to perform unauthorized actions or steal sensitive data.
If Mitigated
With proper network segmentation and monitoring, impact is limited to isolated systems with rapid detection and response.
🎯 Exploit Status
Exploitation requires valid user credentials but bypasses 2FA requirements.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.5.0
Vendor Advisory: https://www.drupal.org/sa-contrib-2024-003
Restart Required: No
Instructions:
1. Update the TFA module to version 1.5.0 or later via Drupal's update manager. 2. Clear Drupal caches. 3. Test 2FA functionality.
🔧 Temporary Workarounds
Disable TFA module
allTemporarily disable the vulnerable TFA module until patching is possible
drush pm-disable tfa
🧯 If You Can't Patch
- Implement network-level access controls to restrict Drupal admin interfaces
- Enable detailed authentication logging and monitor for suspicious login patterns
🔍 How to Verify
Check if Vulnerable:
Check TFA module version in Drupal's Extend page or via drush: drush pm-list | grep tfaCheck Version:
drush pm-list --fields=name,version | grep tfaVerify Fix Applied:
Confirm TFA module version is 1.5.0 or higher and test 2FA login functionality📡 Detection & Monitoring
Log Indicators:
- Multiple failed 2FA attempts from same IP
- Successful logins without 2FA completion
- Unusual authentication patterns
Network Indicators:
- Unusual authentication traffic to Drupal login endpoints
- Traffic patterns suggesting authentication bypass attempts
SIEM Query:
source="drupal" (event_type="authentication" AND (2fa_status="bypassed" OR 2fa_status="failed"))