cve/2021/CVE-2021-23385.md

CVE-2021-23385

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.

POC

Reference

• https://security.snyk.io/vuln/SNYK-PYTHON-FLASKSECURITY-1293234
• https://snyk.io/blog/url-confusion-vulnerabilities/

Github

• https://github.com/20142995/nuclei-templates
• https://github.com/ARPSyndicate/cvemon
• https://github.com/cyb3r-w0lf/nuclei-template-collection