CVE-2021-23393: Open redirect in Flask-Unchained
(updated )
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
- github.com/advisories/GHSA-pjc4-3w99-j7v4
- github.com/briancappello/flask-unchained/commit/2bfeedf1bc31df851cab8c66df0c432b10406aad
- github.com/briancappello/flask-unchained/commit/71e36b28166f9ffbe0a991f51127f0984f7e6a40
- github.com/pypa/advisory-database/tree/main/vulns/flask-unchained/PYSEC-2021-96.yaml
- nvd.nist.gov/vuln/detail/CVE-2021-23393
- snyk.io/vuln/SNYK-PYTHON-FLASKUNCHAINED-1293189
Code Behaviors & Features
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