CVE-2021-29621: Observable Response Discrepancy in Flask-AppBuilder
First published: Thu May 27 2021(Updated: )
### Impact User enumeration in database authentication in Flask-AppBuilder <= 3.2.3. Allows for a non authenticated user to enumerate existing accounts by timing the response time from the server when you are logging in. ### Patches Upgrade to 3.3.0 ### For more information If you have any questions or comments about this advisory: * Open an issue in [Flask-AppBuilder](https://github.com/dpgaspar/Flask-AppBuilder)
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Flask-appbuilder Project Flask-appbuilder | <=3.2.3 | |
| Apache Airflow | =1.10.0 | |
| pip/Flask-AppBuilder | <3.3.0 | 3.3.0 |
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Reference Links
- https://github.com/dpgaspar/Flask-AppBuilder/commit/780bd0e8fbf2d36ada52edb769477e0a4edae580
- https://github.com/dpgaspar/Flask-AppBuilder/security/advisories/GHSA-434h-p4gx-jm89
- https://lists.apache.org/thread.html/r466759f377651f0a690475d5a52564d0e786e82c08d5a5730a4f8352@%3Cannounce.apache.org%3E
- https://lists.apache.org/thread.html/r5b754118ba4e996adf03863705d34168bffec202da5c6bdc9bf3add5@%3Cannounce.apache.org%3E
- https://lists.apache.org/thread.html/r91067f953906d93aaa1c69fe2b5472754019cc6bd4f1ba81349d62a0@%3Ccommits.airflow.apache.org%3E
- https://pypi.org/project/Flask-AppBuilder/
- https://lists.apache.org/thread.html/r5b754118ba4e996adf03863705d34168bffec202da5c6bdc9bf3add5%40%3Cannounce.apache.org%3E
- https://lists.apache.org/thread.html/r466759f377651f0a690475d5a52564d0e786e82c08d5a5730a4f8352%40%3Cannounce.apache.org%3E
- https://lists.apache.org/thread.html/r91067f953906d93aaa1c69fe2b5472754019cc6bd4f1ba81349d62a0%40%3Ccommits.airflow.apache.org%3E
- https://nvd.nist.gov/vuln/detail/CVE-2021-29621
- https://github.com/pypa/advisory-database/tree/main/vulns/flask-appbuilder/PYSEC-2021-90.yaml
- https://pypi.org/project/Flask-AppBuilder
- https://github.com/advisories/GHSA-434h-p4gx-jm89 (Advisory)
Frequently Asked Questions
What is CVE-2021-29621?
CVE-2021-29621 is a vulnerability in Flask-AppBuilder <= 3.2.3 that allows a non-authenticated user to enumerate existing accounts by timing the response time from the server during login.
What is the severity of CVE-2021-29621?
The severity of CVE-2021-29621 is medium with a CVSS score of 5.3.
How does CVE-2021-29621 affect Flask-AppBuilder?
CVE-2021-29621 affects Flask-AppBuilder versions up to and including 3.2.3.
How can I fix CVE-2021-29621?
To fix CVE-2021-29621, upgrade Flask-AppBuilder to version 3.3 or higher.
Is Apache Airflow affected by CVE-2021-29621?
Yes, Apache Airflow version 1.10.0 is also affected by CVE-2021-29621.
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