CVE-2021-21241
HIGH7.4EPSS 0.42%CSRF can expose users authentication token
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.
Affected packages (3)
- Debian/flask-securityfrom 0, < 4.0.0-1
- PyPI/flask-security-too>= 3.3.0, < 3.4.5
- PyPI/flask-security-toofrom 0, < 61d313150b5f620d0b800896c4f2199005e84b1f, < 6d50ee9169acf813257c37b75babe9c28e83542a | >= 3.3.0, < 3.4.5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N |
| osv | CVSS 3.1 | HIGH7.4 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N |
References (14)
- ADVISORYhttps://github.com/Flask-Middleware/flask-security/security/advisories/GHSA-hh7m-rx4f-4vpv
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2021-21241
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2021-21241
- PATCHhttps://github.com/Flask-Middleware/flask-security/commit/61d313150b5f620d0b800896c4f2199005e84b1f
- PATCHhttps://github.com/Flask-Middleware/flask-security/commit/6d50ee9169acf813257c37b75babe9c28e83542a
- WEBhttps://github.com/Flask-Middleware/flask-security/pull/422
- WEBhttps://github.com/Flask-Middleware/flask-security/releases/tag/3.4.5
- WEBhttps://github.com/pypa/advisory-database/tree/main/vulns/flask-security-too/PYSEC-2021-91.yaml
- WEBhttps://pypi.org/project/Flask-Security-Too
- WEBhttps://web.archive.org/web/20210118165844/https://github.com/Flask-Middleware/flask-security/releases/tag/3.4.5
- WEBhttps://web.archive.org/web/20210118165958/https://github.com/Flask-Middleware/flask-security/commit/6d50ee9169acf813257c37b75babe9c28e83542a
- WEBhttps://web.archive.org/web/20210118170445/https://github.com/Flask-Middleware/flask-security/commit/61d313150b5f620d0b800896c4f2199005e84b1f
- WEBhttps://web.archive.org/web/20210118170502/https://github.com/Flask-Middleware/flask-security/security/advisories/GHSA-hh7m-rx4f-4vpv
- WEBhttps://web.archive.org/web/20211207005640/https://github.com/Flask-Middleware/flask-security/pull/422