CVE-2021-23393

Published on: 06/10/2021 12:00:00 AM UTC

Last Modified on: 06/11/2021 11:11:00 AM UTC

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:U/RC:C

The following vulnerability was found:

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.

CVE References

Description Tags Link
add tests for validate_redirect_url · briancappello/[email protected] · GitHub github.com
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URL Logo MISC github.com/briancappello/flask-unchained/commit/71e36b28166f9ffbe0a991f51127f0984f7e6a40
Open Redirect in flask-unchained | Snyk snyk.io
text/html
URL Logo MISC snyk.io/vuln/SNYK-PYTHON-FLASKUNCHAINED-1293189

Discovery Credit

Noam Moshe of Claroty

Social Mentions

Source Title Posted (UTC)
Twitter Icon @CVEreport CVE-2021-23393 : This affects the package Flask-Unchained before 0.9.0. When using the the _validate_redirect_url… twitter.com/i/web/status/1… 2021-06-10 23:21:45
Reddit Logo Icon /r/netcve CVE-2021-23393 2021-06-11 00:42:45
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