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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Arch Fixed 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Fixed | 4.0.1-1 |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 4.0.0-1 |
| sid | Fixed | 4.0.0-1 |
| forky | Fixed | 4.0.0-1 |
| bullseye | Fixed | 4.0.0-1 |
| bookworm | Fixed | 4.0.0-1 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| PyPI | flask-security-too | >=3.3.0,<3.4.5 | 3.4.5 |
| PyPI | flask-security-too | <6d50ee9169acf813257c37b75babe9c28e83542a||>=3.3.0,<3.4.5 | 61d313150b5f620d0b800896c4f2199005e84b1f |
References
- https://security.archlinux.org/ASA-202105-2
- https://nvd.nist.gov/vuln/detail/CVE-2021-21241
- https://github.com/pypa/advisory-database/tree/main/vulns/flask-security-too/PYSEC-2021-91.yaml
- https://pypi.org/project/Flask-Security-Too
- https://web.archive.org/web/20210118165844/https://github.com/Flask-Middleware/flask-security/releases/tag/3.4.5
- https://web.archive.org/web/20210118165958/https://github.com/Flask-Middleware/flask-security/commit/6d50ee9169acf813257c37b75babe9c28e83542a
- https://web.archive.org/web/20210118170445/https://github.com/Flask-Middleware/flask-security/commit/61d313150b5f620d0b800896c4f2199005e84b1f
- https://web.archive.org/web/20210118170502/https://github.com/Flask-Middleware/flask-security/security/advisories/GHSA-hh7m-rx4f-4vpv
- https://web.archive.org/web/20211207005640/https://github.com/Flask-Middleware/flask-security/pull/422
- https://github.com/Flask-Middleware/flask-security/releases/tag/3.4.5
- https://github.com/Flask-Middleware/flask-security/commit/61d313150b5f620d0b800896c4f2199005e84b1f
- https://github.com/Flask-Middleware/flask-security/security/advisories/GHSA-hh7m-rx4f-4vpv
- https://github.com/Flask-Middleware/flask-security/pull/422
- https://github.com/Flask-Middleware/flask-security/commit/6d50ee9169acf813257c37b75babe9c28e83542a
- https://www.suse.com/security/cve/CVE-2021-21241.html
- https://security-tracker.debian.org/tracker/CVE-2021-21241
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.