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CVE-2021-21241

7.4 · HIGH

The Python "Flask-Security-Too" package is used for adding security features to your Flask application.

Published Jan 11, 2021CWE-352EPSS 0.93%

Overview

CVE-2021-21241 is a high-severity vulnerability. It was published on January 11, 2021 and has a CVSS 3.1 base score of 7.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The Python "Flask-Security-Too" package is used for adding security features to your Flask application. It is an is a independently maintained version of Flask-Security based on the 3.0.0 version of Flask-Security. In Flask-Security-Too from version 3.3.0 and before version 3.4.5, the /login and /change endpoints can return the authenticated user's authentication token in response to a GET request. Since GET requests aren't protected with a CSRF token, this could lead to a malicious 3rd party site acquiring the authentication token. Version 3.4.5 and version 4.0.0 are patched. As a workaround, if you aren't using authentication tokens - you can set the SECURITY_TOKEN_MAX_AGE to "0" (seconds) which should make the token unusable.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/Flask-Middleware/flask-security/commit/61d313150b5f620d0b800896c4f2199005e84b1fGitHubgithub.com/Flask-Middleware/flask-security/commit/6d50ee9169acf813257c37b75babe9c28e83542aGitHubgithub.com/Flask-Middleware/flask-security/pull/422GitHubgithub.com/Flask-Middleware/flask-security/releases/tag/3.4.5GitHubgithub.com/Flask-Middleware/flask-security/security/advisories/GHSA-hh7m-rx4f-4vpvRefpypi.org/project/Flask-Security-TooGitHubgithub.com/Flask-Middleware/flask-security/commit/61d313150b5f620d0b800896c4f2199005e84b1fGitHubgithub.com/Flask-Middleware/flask-security/commit/6d50ee9169acf813257c37b75babe9c28e83542aGitHubgithub.com/Flask-Middleware/flask-security/pull/422GitHubgithub.com/Flask-Middleware/flask-security/releases/tag/3.4.5

How CyberStrike helps

Frequently asked questions

What is CVE-2021-21241?

CVE-2021-21241 is a high-severity vulnerability. It was published on January 11, 2021 and has a CVSS 3.1 base score of 7.4 (HIGH).

How severe is CVE-2021-21241?

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-21241?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-21241?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-21241 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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