Vulnerability Details : CVE-2021-21241
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.
Vulnerability category: Cross-site request forgery (CSRF)
Products affected by CVE-2021-21241
- Flask-security-too Project » Flask-security-tooVersions from including (>=) 3.3.0 and before (<) 3.4.5cpe:2.3:a:flask-security-too_project:flask-security-too:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-21241
0.31%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 51 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-21241
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:N/A:N |
8.6
|
2.9
|
NIST | |
|
7.4
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N |
2.8
|
4.0
|
NIST | |
|
7.4
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N |
2.8
|
4.0
|
GitHub, Inc. |
CWE ids for CVE-2021-21241
-
The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.Assigned by: security-advisories@github.com (Primary)
References for CVE-2021-21241
-
https://github.com/Flask-Middleware/flask-security/pull/422
Fix security vuln - GET on /login or /change could reveal authenticat… by jwag956 · Pull Request #422 · Flask-Middleware/flask-security · GitHubPatch;Third Party Advisory
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https://github.com/Flask-Middleware/flask-security/commit/6d50ee9169acf813257c37b75babe9c28e83542a
Fix security vuln - GET on /login or /change could reveal authenticat… · Flask-Middleware/flask-security@6d50ee9 · GitHubPatch;Third Party Advisory
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https://github.com/Flask-Middleware/flask-security/security/advisories/GHSA-hh7m-rx4f-4vpv
CSRF Vuln can expose users authentication token · Advisory · Flask-Middleware/flask-security · GitHubThird Party Advisory
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https://github.com/Flask-Middleware/flask-security/commit/61d313150b5f620d0b800896c4f2199005e84b1f
I421backport (#425) · Flask-Middleware/flask-security@61d3131 · GitHubPatch;Third Party Advisory
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https://github.com/Flask-Middleware/flask-security/releases/tag/3.4.5
Release Fix CSRF Vulnerability · Flask-Middleware/flask-security · GitHubThird Party Advisory
-
https://pypi.org/project/Flask-Security-Too
Flask-Security-Too · PyPIProduct;Third Party Advisory
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