Key Collision Vulnerability in Python-Django: CVE-2020-13254
Summary
UBUNTU-CVE-2020-13254: An issue was discovered in Django 2.2 before 2.2.13 and 3.0 before 3.0.7. Affects python-django versions < 1.6.11-0ubuntu1.3+esm1. Fixed in 1.6.11-0ubuntu1.3+esm1. How to fix ↓
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Background
Python-Django is a high-level Python web framework that encourages rapid development and clean, pragmatic design. It is widely used for building web applications and provides a robust set of features, including an ORM, URL routing, and templating. The vulnerability CVE-2020-13254 affects various versions of Python-Django, specifically those using a memcached backend that does not validate cache keys, leading to potential data leakage.
Vulnerability Detail
An issue was discovered in Django versions 2.2 before 2.2.13 and 3.0 before 3.0.7. The vulnerability arises when a memcached backend fails to perform key validation, allowing attackers to pass malformed cache keys. This can result in key collisions, leading to unintended data exposure and potential data leakage. The severity of this vulnerability is reflected in its CVSS score of 5.9, indicating a medium risk to affected systems.
How To Fix
Minimum fixed version
1.6.11-0ubuntu1.3+esm1
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
As a temporary measure, consider disabling the use of the memcached backend until the package can be updated. This can be done by modifying the Django settings to use a different caching backend that performs key validation.
Conclusion
CVE-2020-13254 is a significant vulnerability in Python-Django that can lead to data leakage due to improper key validation in memcached backends. It is crucial for users to update their packages to the patched versions to mitigate this risk. Temporary workarounds are available, but updating is the best long-term solution.
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FAQ
CVE-2020-13254 is a vulnerability in Python-Django that allows for key collisions in memcached backends, potentially leading to data leakage.
The vulnerability affects Django versions 2.2 before 2.2.13 and 3.0 before 3.0.7, as well as various versions in Ubuntu distributions.
You can use Vulert, which monitors open-source vulnerabilities in your software using a manifest file. Check your application against the vulnerability using the Vulert playground at Vulert Scanner.
If immediate updates are not possible, consider disabling the memcached backend or switching to a different caching mechanism that validates keys.
The CVSS score of CVE-2020-13254 is 5.9, indicating a medium level of risk.
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