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CVE-2021-23385

5.4 · MEDIUM

This affects all versions of package Flask-Security.

Published Aug 2, 2022CWE-601EPSS 1.22%

Overview

CVE-2021-23385 is a medium-severity vulnerability. It was published on August 2, 2022 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

This affects all versions of package Flask-Security. When using the get_post_logout_redirect and get_post_login_redirect functions, 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. **Note:** Flask-Security is not maintained anymore.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/mattupstate/flask-securityReflists.debian.org/debian-lts-announce/2023/08/msg00034.htmlRefsecurity.snyk.io/vuln/SNYK-PYTHON-FLASKSECURITY-1293234Refsnyk.io/blog/url-confusion-vulnerabilities/GitHubgithub.com/mattupstate/flask-securityReflists.debian.org/debian-lts-announce/2023/08/msg00034.htmlRefsecurity.snyk.io/vuln/SNYK-PYTHON-FLASKSECURITY-1293234Refsnyk.io/blog/url-confusion-vulnerabilities/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-23385?

CVE-2021-23385 is a medium-severity vulnerability. It was published on August 2, 2022 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2021-23385?

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-23385?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-23385?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-23385 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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