CVE-2024-11941
📋 TL;DR
A denial-of-service vulnerability in Drupal Core allows attackers to cause excessive resource allocation through specially crafted requests. This affects Drupal sites running versions 10.2.0-10.2.1 and 10.1.0-10.1.7, potentially leading to service disruption.
💻 Affected Systems
- Drupal Core
📦 What is this software?
Drupal by Drupal
Drupal by Drupal
⚠️ Risk & Real-World Impact
Worst Case
Complete service unavailability due to resource exhaustion, affecting all users and potentially causing extended downtime.
Likely Case
Performance degradation or intermittent service disruption affecting user experience and site functionality.
If Mitigated
Minimal impact with proper rate limiting and resource monitoring in place.
🎯 Exploit Status
The vulnerability is in core functionality and requires minimal technical skill to exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 10.2.2 or 10.1.8
Vendor Advisory: https://www.drupal.org/sa-core-2024-001
Restart Required: No
Instructions:
1. Backup your Drupal site and database. 2. Update Drupal Core using Composer: 'composer update drupal/core-recommended --with-dependencies'. 3. Run database updates: 'drush updatedb' or via admin interface. 4. Clear caches: 'drush cr' or via admin interface.
🔧 Temporary Workarounds
Rate Limiting
allImplement request rate limiting to prevent resource exhaustion attacks.
# Configure web server rate limiting (nginx example)
limit_req_zone $binary_remote_addr zone=drupal_limit:10m rate=10r/s;
limit_req zone=drupal_limit burst=20 nodelay;
Resource Monitoring
linuxMonitor and alert on abnormal resource usage patterns.
# Monitor Apache/Nginx logs for excessive requests
tail -f /var/log/nginx/access.log | grep -E '(POST|GET).*drupal'
# Monitor system resources
watch -n 5 'ps aux | grep php | head -20'
🧯 If You Can't Patch
- Implement strict rate limiting and web application firewall rules to block suspicious request patterns.
- Monitor server resources closely and implement automated alerts for abnormal CPU/memory usage.
🔍 How to Verify
Check if Vulnerable:
Check Drupal version via admin interface at /admin/reports/status or run: 'drush status | grep "Drupal version"'Check Version:
drush status | grep "Drupal version"Verify Fix Applied:
Confirm version is 10.2.2 or higher, or 10.1.8 or higher. Check vendor advisory for specific patch verification.📡 Detection & Monitoring
Log Indicators:
- Unusually high number of similar requests in short timeframes
- Increased PHP process memory/CPU usage
- Error logs showing resource exhaustion messages
Network Indicators:
- Spike in incoming HTTP requests to Drupal endpoints
- Abnormal request patterns from single IP addresses
SIEM Query:
source="web_server_logs" | stats count by src_ip, uri | where count > 1000