Critical Flask Vulnerability: Key Rotation Flaw in Package Version 3.1.0-2ubuntu1.1
Summary
USN-7534-1: flask vulnerability. Affects flask versions < 3.1.0-2ubuntu1.1. Fixed in 3.1.0-2ubuntu1.1. How to fix ↓
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Background
Flask is a popular web framework for Python, designed to make it easy to build web applications quickly and with minimal code. It is lightweight and modular, allowing developers to choose the components they need. However, a recent vulnerability has been identified in version 3.1.0-2ubuntu1.1, which affects its ability to securely handle key rotation, potentially compromising session security.
Vulnerability Detail
The vulnerability arises from Flask's improper handling of key rotation. This flaw allows an attacker to sign sessions using outdated keys, which can lead to unauthorized access and session hijacking. The issue is particularly concerning as it undermines the integrity of session management, a critical aspect of web application security.
How To Fix
Minimum fixed version
3.1.0-2ubuntu1.1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade flaskTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, you can implement additional session validation mechanisms or limit the session lifespan to reduce the risk of stale keys being used. However, updating to the patched version is the most effective solution.
Conclusion
In summary, the identified vulnerability in Flask poses a significant risk to web applications by allowing session signing with stale keys. It is crucial to update to the patched version to mitigate this risk effectively. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
The vulnerability involves improper key rotation handling, which could allow attackers to sign sessions with outdated keys.
You can use Vulert's playground at Vulert Scanner to check if your application is impacted by this vulnerability without any signup.
If exploited, this vulnerability could lead to session hijacking, allowing attackers to impersonate legitimate users.
Yes, the patched version of Flask is 3.1.0-2ubuntu1.1, which addresses this vulnerability.
If immediate updates are not possible, consider implementing additional session validation or reducing session lifetimes as a temporary measure.
References
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