CVE-2021-21241

Impact

### Issue 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. ### Patches Version 3.4.5 and soon to be released 4.0.0 are patched. ### Workarounds If you aren't using authentication tokens - you can set the SECURITY_TOKEN_MAX_AGE to "0" (seconds) which should make the token unusable. ### References None

Affected packages

Affected products

Weakness classification

References

• NVD record
• CVE.org record
• GitHub advisory
• https://github.com/Flask-Middleware/flask-security/commit/61d313150b5f620d0b800896c4f2199005e84b1f
• https://github.com/Flask-Middleware/flask-security/commit/6d50ee9169acf813257c37b75babe9c28e83542a
• 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/security/advisories/GHSA-hh7m-rx4f-4vpv
• https://pypi.org/project/Flask-Security-Too
• https://github.com/advisories/GHSA-hh7m-rx4f-4vpv
• 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://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/20211207005640/https://github.com/Flask-Middleware/flask-security/pull/422
• https://web.archive.org/web/20210118170502/https://github.com/Flask-Middleware/flask-security/security/advisories/GHSA-hh7m-rx4f-4vpv