Open redirect in Flask-Unchained
Moderate severity
GitHub Reviewed
Published
Jun 15, 2021
to the GitHub Advisory Database
•
Updated Jan 9, 2023
Description
Reviewed
Jun 14, 2021
Published to the GitHub Advisory Database
Jun 15, 2021
Last updated
Jan 9, 2023
This affects the package Flask-Unchained before 0.9.0. When using the the _validate_redirect_url function, 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.
References