CVE-2021-23385 Information

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.

Reference

https://security.snyk.io/vuln/SNYK-PYTHON-FLASKSECURITY-1293234 https://github.com/mattupstate/flask-security https://snyk.io/blog/url-confusion-vulnerabilities/ https://snyk.io/blog/url-confusion-vulnerabilities/