CVE-2021-23401

Summary

This affects all versions of package Flask-User. When using the make_safe_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 or \\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.

Affected Software

Weaknesses

• Open Redirect

ADP Enrichment

CVE Program Container

Additional References

• https://snyk.io/vuln/SNYK-PYTHON-FLASKUSER-1293188
• https://github.com/lingthio/Flask-User
• https://github.com/lingthio/Flask-User/blob/master/flask_user/user_manager__utils.py

References

• https://snyk.io/vuln/SNYK-PYTHON-FLASKUSER-1293188
• https://github.com/lingthio/Flask-User
• https://github.com/lingthio/Flask-User/blob/master/flask_user/user_manager__utils.py

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