CVE-2013-4315: Directory Traversal Vulnerability in Django

Background

Django is a popular Python web framework known for its simplicity and versatility. It provides developers with a high-level API to build web applications rapidly. The vulnerability in question affects Django versions 1.4.x through 1.4.6, 1.5.x through 1.5.3, and 1.6.x through 1.6 beta 3. This vulnerability allows remote attackers to read arbitrary files by exploiting a directory traversal flaw in the ALLOWED_INCLUDE_ROOTS setting followed by a '..' (dot dot) in a ssi template tag.

Vulnerability Detail

The directory traversal vulnerability in Django arises from improper input validation. By manipulating the file path in the ALLOWED_INCLUDE_ROOTS setting and utilizing the '..' sequence in a ssi template tag, an attacker can bypass security measures and access arbitrary files on the server. This can lead to unauthorized disclosure of sensitive information, such as configuration files or user data. It is important to note that this vulnerability requires the ALLOWED_INCLUDE_ROOTS setting to be misconfigured.

pip install --upgrade "django==6.1.2"

Workaround

If upgrading Django is not immediately feasible, a temporary workaround can be implemented. It involves validating and sanitizing user input to prevent directory traversal attacks. Here is an example of how to sanitize file paths in a Django view:

import os
from django.http import HttpResponse

def serve_file(request):
    file_path = request.GET.get('file_path', '')
    # Sanitize file_path to prevent directory traversal
    file_path = os.path.abspath(file_path)
    # Perform additional checks if necessary
    # ...
    # Serve the file
    with open(file_path, 'rb') as file:
        response = HttpResponse(file.read(), content_type='application/octet-stream')
        response['Content-Disposition'] = f'attachment; filename={os.path.basename(file_path)}'
        return response

This code snippet demonstrates how to sanitize the 'file_path' parameter received from a GET request. By using the os.path.abspath() function, the file path is resolved to an absolute path, preventing any directory traversal attempts.

Conclusion

The directory traversal vulnerability in Django versions 1.4.x through 1.4.6, 1.5.x through 1.5.3, and 1.6.x through 1.6 beta 3 poses a significant risk to the security of web applications. It allows remote attackers to read arbitrary files on the server, potentially leading to unauthorized disclosure of sensitive information. It is crucial to upgrade Django to the patched versions and properly configure the ALLOWED_INCLUDE_ROOTS setting to mitigate this vulnerability. For further assistance and support in vulnerability remediation, please contact DevNack.com.

See every vulnerability recorded for django →

FAQ