CVE-2024-39614
📋 TL;DR
This vulnerability in Django's get_supported_language_variant() function allows attackers to cause denial-of-service by sending very long strings with specific characters. It affects Django applications using this function for language handling. Django 5.0 before 5.0.7 and 4.2 before 4.2.14 are vulnerable.
💻 Affected Systems
- Django
📦 What is this software?
Django by Djangoproject
Django by Djangoproject
⚠️ Risk & Real-World Impact
Worst Case
Complete service unavailability due to resource exhaustion, potentially affecting all users of the Django application.
Likely Case
Degraded performance or temporary service disruption affecting specific endpoints using language variant functionality.
If Mitigated
Minimal impact with proper input validation and resource limits in place.
🎯 Exploit Status
Exploitation requires sending specially crafted long strings to endpoints using the vulnerable function.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Django 5.0.7 or 4.2.14
Vendor Advisory: https://www.djangoproject.com/weblog/2024/jul/09/security-releases/
Restart Required: Yes
Instructions:
1. Backup your Django project. 2. Update Django using pip: 'pip install Django==5.0.7' or 'pip install Django==4.2.14'. 3. Restart your Django application server. 4. Verify the update with 'python -m django --version'.
🔧 Temporary Workarounds
Input Length Limitation
allImplement request size limits and input validation to restrict long strings.
# In Django settings or middleware, implement request size limits
# Example using Django middleware or web server configuration
Disable Vulnerable Function
allAvoid using get_supported_language_variant() if not essential for your application.
# Review codebase for usage of get_supported_language_variant()
# Replace with alternative language handling if possible
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block requests with very long strings containing suspicious patterns.
- Monitor application performance metrics and logs for unusual resource consumption patterns.
🔍 How to Verify
Check if Vulnerable:
Check Django version with 'python -m django --version'. If version is 5.0.0-5.0.6 or 4.2.0-4.2.13, you are vulnerable.Check Version:
python -m django --versionVerify Fix Applied:
After patching, verify version shows 5.0.7 or 4.2.14. Test language handling functionality works normally.📡 Detection & Monitoring
Log Indicators:
- Unusually long request strings in access logs
- High CPU/memory usage spikes in system logs
- Error logs related to language handling functions
Network Indicators:
- Large HTTP requests to language-related endpoints
- Repeated requests with similar long string patterns
SIEM Query:
source="django_access.log" AND (request_length>10000 OR uri CONTAINS "language" OR uri CONTAINS "locale")🔗 References
- https://docs.djangoproject.com/en/dev/releases/security/
- https://groups.google.com/forum/#%21forum/django-announce
- https://www.djangoproject.com/weblog/2024/jul/09/security-releases/
- https://docs.djangoproject.com/en/dev/releases/security/
- https://groups.google.com/forum/#%21forum/django-announce
- https://security.netapp.com/advisory/ntap-20240808-0005/
- https://www.djangoproject.com/weblog/2024/jul/09/security-releases/
