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

0.0
medium

Snyk CVSS

    Attack Complexity Low
    User Interaction Required

    Threat Intelligence

    Exploit Maturity Proof of concept
    EPSS 0.06% (22nd percentile)
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NVD
5.4 medium

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  • Snyk ID SNYK-PYTHON-FLASKUNCHAINED-1293189
  • published 10 Jun 2021
  • disclosed 15 May 2021
  • credit Noam Moshe of Claroty
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Introduced: 15 May 2021

CVE-2021-23393 Open this link in a new tab
CWE-601 Open this link in a new tab
First added by Snyk

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`.