CVE-2021-23385

medium

Description

This affects all versions of package Flask-Security. When using the get_post_logout_redirect and get_post_login_redirect functions, it is possible to bypass URL validation and redirect a user to an arbitrary URL by providing multiple back slashes such as \\\evil.com/path. This vulnerability is only exploitable if an alternative WSGI server other than Werkzeug is used, or the default behaviour of Werkzeug is modified using 'autocorrect_location_header=False. **Note:** Flask-Security is not maintained anymore.

References

https://snyk.io/blog/url-confusion-vulnerabilities/

https://security.snyk.io/vuln/SNYK-PYTHON-FLASKSECURITY-1293234

https://lists.debian.org/debian-lts-announce/2023/08/msg00034.html

https://github.com/mattupstate/flask-security

Details

Source: Mitre, NVD

Published: 2022-08-02

Updated: 2023-08-28

Risk Information

CVSS v2

Base Score: 6.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 6.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Severity: Medium