Open Redirect Affecting flask-unchained package, versions [,0.9.0)


0.0
medium
  • Exploit Maturity

    Proof of concept

  • Attack Complexity

    Low

  • User Interaction

    Required

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  • snyk-id

    SNYK-PYTHON-FLASKUNCHAINED-1293189

  • published

    10 Jun 2021

  • disclosed

    15 May 2021

  • credit

    Noam Moshe of Claroty

How to fix?

Upgrade Flask-Unchained to version 0.9.0 or higher.

Overview

Flask-Unchained is a The quickest and easiest way to build large web apps and APIs with Flask and SQLAlchemy

Affected versions of this package are vulnerable to Open Redirect. 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`.