CVE-2021-21241

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.

How to fix CVE-2021-21241

To remediate CVE-2021-21241, upgrade the affected package to a fixed version below.

• —upgrade to 4.0.0-1 or later
• —upgrade to 3.4.5 or later
• —upgrade to 61d313150b5f620d0b800896c4f2199005e84b1f or later

Is CVE-2021-21241 being exploited?

Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.

Affected packages (3)

• from 0, < 4.0.0-1
• >= 3.3.0, < 3.4.5
• from 0, < 61d313150b5f620d0b800896c4f2199005e84b1f, < 6d50ee9169acf813257c37b75babe9c28e83542a | >= 3.3.0, < 3.4.5

CVSS scores

References (14)

• ADVISORYgithub.com/Flask-Middleware/flask-security/security/advisories/GHSA-hh7m-rx4f-4vpv
• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-21241
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2021-21241
• PATCHgithub.com/Flask-Middleware/flask-security/commit/61d313150b5f620d0b800896c4f2199005e84b1f