CVE-2021-32805: URL Redirection to Untrusted Site ('Open Redirect') in Flask-AppBuilder
First published: Wed Sep 08 2021(Updated: )
### Impact If using Flask-AppBuilder OAuth, an attacker can share a carefully crafted URL with a trusted domain for an application built with Flask-AppBuilder, this URL can redirect a user to a malicious site. This is an open redirect vulnerability ### Patches Install Flask-AppBuilder 3.2.2 or above ### Workarounds Filter HTTP traffic containing `?next={next-site}` where the `next-site` domain is different from the application you are protecting
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Flask-appbuilder Project Flask-appbuilder | <3.3.2 | |
| pip/Flask-AppBuilder | <3.3.2 | 3.3.2 |
| <3.3.2 |
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Reference Links
- https://github.com/dpgaspar/Flask-AppBuilder/commit/6af28521589599b1dbafd6313256229ee9a4fa74
- https://github.com/dpgaspar/Flask-AppBuilder/security/advisories/GHSA-624f-cqvr-3qw4
- https://github.com/dpgaspar/Flask-AppBuilder/releases/tag/v3.3.2
- https://nvd.nist.gov/vuln/detail/CVE-2021-32805
- https://github.com/pypa/advisory-database/tree/main/vulns/flask-appbuilder/PYSEC-2021-359.yaml
- https://pypi.org/project/Flask-AppBuilder
- https://github.com/advisories/GHSA-624f-cqvr-3qw4 (Advisory)
Frequently Asked Questions
What is CVE-2021-32805?
CVE-2021-32805 is a vulnerability in Flask-AppBuilder, an application development framework built on top of Flask.
What is the severity of CVE-2021-32805?
The severity of CVE-2021-32805 is high, with a severity value of 6.1.
How does CVE-2021-32805 affect Flask-AppBuilder?
In affected versions of Flask-AppBuilder, if using Flask-AppBuilder OAuth, an attacker can share a carefully crafted URL with a trusted domain for an application built with Flask-AppBuilder, redirecting users to a malicious site.
What is the affected software of CVE-2021-32805?
The affected software is Flask-AppBuilder version up to exclusive 3.3.2.
Is there a fix for CVE-2021-32805?
Yes, updating Flask-AppBuilder to a version beyond 3.3.2 will resolve the vulnerability.
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