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


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

Exploit Maturity
Proof of concept
EPSS
0.06% (26th percentile)

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  • Snyk IDSNYK-PYTHON-FLASKUNCHAINED-1293189
  • published10 Jun 2021
  • disclosed15 May 2021
  • creditNoam Moshe of Claroty

Introduced: 15 May 2021

CVE-2021-23393  (opens in a new tab)
CWE-601  (opens 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`.

CVSS Scores

version 3.1