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CVE-2021-21241— CSRF can expose users authentication token in Flask-Security-Too

Quick assessment

Affected
Flask-Middleware flask-security-too
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Flask Middleware Flask-security是Flask Middleware组织的一个基于Python的可为Flask应用提供安全功能的代码库。 Flask Middleware Flask-security 版本3.3.0 至 3.4.5版本中存在跨站请求伪造漏洞。该漏洞源于在用户可通过GET请求 /login and /change 获得验证Token，使CSRF token的安全性无法保障。

CVSS 7.4 · High EPSS 0.92% · P58
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I. Basic Information for CVE-2021-21241

Vulnerability Information
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Vulnerability Title
CSRF can expose users authentication token in Flask-Security-Too
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Flask Middleware Flask-security 跨站请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Flask Middleware Flask-security是Flask Middleware组织的一个基于Python的可为Flask应用提供安全功能的代码库。 Flask Middleware Flask-security 版本3.3.0 至 3.4.5版本中存在跨站请求伪造漏洞。该漏洞源于在用户可通过GET请求 /login and /change 获得验证Token，使CSRF token的安全性无法保障。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Flask-Middleware flask-security-too >= 3.3.0, < 3.4.5 -

II. Public POCs for CVE-2021-21241

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III. Intelligence Information for CVE-2021-21241

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Patches & Fixes for CVE-2021-21241 (3)

Other References for CVE-2021-21241 (2)

IV. Related Vulnerabilities

Same product: flask-security-too
Same vendor: Flask-Middleware
Same weakness: CWE-352

V. Comments for CVE-2021-21241

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