CVE-2024-45230
📋 TL;DR
This vulnerability in Django's urlize() and urlizetrunc() template filters allows attackers to cause denial-of-service by submitting very large inputs with specific character sequences. All Django applications using these template filters are affected, particularly those processing user-generated content.
💻 Affected Systems
- Django
📦 What is this software?
Django by Djangoproject
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 application.
Likely Case
Degraded performance or temporary service disruption for affected endpoints processing malicious inputs.
If Mitigated
Minimal impact with proper input validation and resource limits in place.
🎯 Exploit Status
Exploitation requires sending specially crafted large inputs to endpoints using vulnerable template filters.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Django 5.1.1, Django 5.0.9, Django 4.2.16
Vendor Advisory: https://www.djangoproject.com/weblog/2024/sep/03/security-releases/
Restart Required: Yes
Instructions:
1. Update Django using pip: 'pip install --upgrade Django==5.1.1' (or appropriate version). 2. Restart your Django application server. 3. Verify the update with 'python -m django --version'.
🔧 Temporary Workarounds
Input Length Limitation
allImplement input validation to limit the size of user inputs before passing to urlize() or urlizetrunc() filters.
Template Filter Replacement
allReplace urlize() and urlizetrunc() with custom implementations that include input size checks.
🧯 If You Can't Patch
- Implement strict input validation and size limits on all user inputs before template processing.
- Use web application firewalls (WAF) to block unusually large requests or specific patterns.
🔍 How to Verify
Check if Vulnerable:
Check Django version and if urlize() or urlizetrunc() filters are used in templates with user input.Check Version:
python -m django --versionVerify Fix Applied:
Confirm Django version is 5.1.1, 5.0.9, or 4.2.16 or higher.📡 Detection & Monitoring
Log Indicators:
- Unusually large HTTP requests
- High CPU/memory usage spikes
- Template processing timeouts
Network Indicators:
- Large POST requests to endpoints with template rendering
- Repeated requests with similar large payloads
SIEM Query:
source="web_logs" AND (request_size > 10000 OR uri CONTAINS "template" OR uri CONTAINS "render")