Session Identifier Vulnerability in Django - CVE-2011-4136
Summary
CVE-2011-4136: django.contrib.sessions in Django before 1.2.7 and 1.3.x before 1.3.1, when session data is stored in the cache, uses the root namespace for both session identifiers and application-data keys, which allows remote attacke... Affects python-django versions < 1.3.1-1. Fixed in 1.3.1-1. How to fix ↓
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Background
Django is a high-level Python web framework that encourages rapid development and clean, pragmatic design. It provides a robust set of features for web development, including an ORM, authentication, and session management. The vulnerability in question affects the session management system, specifically when session data is cached, leading to potential session hijacking.
Vulnerability Detail
The vulnerability arises from the way django.contrib.sessions handles session identifiers and application-data keys when session data is stored in the cache. In versions prior to 1.2.7 and 1.3.x before 1.3.1, both session identifiers and application-data keys share the same root namespace. This design flaw allows remote attackers to manipulate a session by using a key that matches the session's identifier, potentially leading to unauthorized access and data manipulation.
How To Fix
Minimum fixed version
1.3.1-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade python-djangoTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If upgrading is not immediately feasible, consider implementing a custom session backend that does not use the cache for session storage, or ensure that session identifiers are not predictable. However, these workarounds may not provide complete protection against session hijacking.
Conclusion
CVE-2011-4136 is a significant vulnerability in Django's session management that can lead to serious security issues if not addressed. Upgrading to the latest version is crucial for maintaining the integrity and security of web applications built with Django.
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FAQ
CVE-2011-4136 is a vulnerability in Django's session management system that allows attackers to modify sessions by exploiting the shared namespace for session identifiers and application-data keys.
Django versions before 1.2.7 and 1.3.x before 1.3.1 are affected by this vulnerability.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring any signup.
If exploited, this vulnerability can lead to session hijacking, allowing attackers to impersonate users and access sensitive information.
While upgrading is the best solution, you can mitigate risks by using a custom session backend or ensuring session identifiers are unpredictable.
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