GitHub Advisoryadvisory · PyPI
GHSA-pjc4-3w99-j7v4 Open redirect in Flask-Unchained
MEDIUM
Official page ↗
- Aliases
- CVE-2021-23393
- Ecosystem
- PyPI
- Packages
- Flask-Unchained
- Severity
- Moderate
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
- Weaknesses
- CWE-601
- Reviewed
- 2021-06-14
Affected packages
• PyPI Flask-Unchained: < 0.9.0 → fixed in 0.9.0
Description
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.
Related
Alias · CVE (1)
- CVE-2021-23393 This affects the package Flask-Unchained before 0.9.0. vulnerability
Weakness · CWE (1)
- CWE-601 URL Redirection to Untrusted Site weakness
References
- https://nvd.nist.gov/vuln/detail/CVE-2021-23393 advisory
- https://github.com/briancappello/flask-unchained/commit/2bfeedf1bc31df851cab8c66df0c432b10406aad web
- https://github.com/briancappello/flask-unchained/commit/71e36b28166f9ffbe0a991f51127f0984f7e6a40 web
- https://github.com/advisories/GHSA-pjc4-3w99-j7v4 advisory
- https://github.com/pypa/advisory-database/tree/main/vulns/flask-unchained/PYSEC-2021-96.yaml web
- https://snyk.io/vuln/SNYK-PYTHON-FLASKUNCHAINED-1293189 web