CVE-2022-21659: User Enumeration Vulnerability in Flask-AppBuilder
Summary
CVE-2022-21659: Flask-AppBuilder is an application development framework, built on top of the Flask web framework. Affects flask-appbuilder versions < 3.4.2. Fixed in 3.4.2. How to fix ↓
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Background
Flask-AppBuilder is an application development framework built on top of the Flask web framework. It provides a set of tools and utilities to simplify the process of building web applications. The framework is widely used in the Python ecosystem and offers features such as authentication, authorization, and user management. However, in certain versions of Flask-AppBuilder, there exists a user enumeration vulnerability that can be exploited by non-authenticated users. This vulnerability allows an attacker to enumerate existing accounts by timing the response time from the server during the login process.
Vulnerability Detail
The user enumeration vulnerability in Flask-AppBuilder arises due to a timing side-channel attack. By carefully measuring the response time from the server during login attempts, an attacker can determine whether a particular username exists in the system. This information can be leveraged to launch further attacks, such as brute-forcing passwords for known usernames. The vulnerability poses a risk to the confidentiality and security of user accounts within affected versions of Flask-AppBuilder.
How To Fix
Minimum fixed version
3.4.2
This is the first release that contains the fix.
pip install --upgrade "flask-appbuilder==3.4.2"Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Conclusion
The user enumeration vulnerability in Flask-AppBuilder can lead to the disclosure of user account information and subsequent attacks. It is crucial for users to upgrade to version 3.4.4 to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
Flask-AppBuilder is an application development framework built on top of Flask, providing tools and utilities for building web applications.
A user enumeration vulnerability allows an attacker to determine the existence of user accounts by exploiting timing differences in the server's response.
The vulnerability in Flask-AppBuilder is a timing side-channel attack, where an attacker measures the response time from the server during login attempts to determine if a username exists.
The user enumeration vulnerability in Flask-AppBuilder can be leveraged by attackers to gather information about existing user accounts, which can then be used for further attacks such as password brute-forcing.
To fix the vulnerability, it is recommended to upgrade to version 3.4.4 of Flask-AppBuilder, which includes a patch for the timing side-channel attack. The upgrade can be done by running 'pip install --upgrade flask-appbuilder==3.4.4'.
References
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