Vulnerability · Published Jun 7, 2021 · Assigned by GitHub_M

CVE-2021-29621Observable Response Discrepancy in Flask-AppBuilder

Medium 5.3

In plain English

A medium-severity security flaw in Flask-AppBuilder from dpgaspar. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 3.4% (higher than 89% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)3.4%top 11.1% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

Flask-AppBuilder is a development framework, built on top of Flask. 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. Upgrade to version 3.3.0 or higher to resolve.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	flask-appbuilder	3.3.0	GHSA-434h-p4gx-jm89
PyPI	flask-appbuilder	3.3.0	PYSEC-2021-90

Affected products (as reported)

Vendor	Product	Versions
dpgaspar	Flask-AppBuilder	< 3.3.0

Weakness: CWE-203 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References

https://github.com/dpgaspar/Flask-AppBuilder/security/advisories/GHSA-434h-p4gx-jm89 x_refsource_CONFIRM
https://github.com/dpgaspar/Flask-AppBuilder/commit/780bd0e8fbf2d36ada52edb769477e0a4edae580 x_refsource_MISC
https://pypi.org/project/Flask-AppBuilder/ x_refsource_MISC
[announce] 20210618 Apache Airflow CVE: CVE-2021-29621: User enumeration in database authentication in Flask-AppBuilder <= 3.2.3. mailing-list, x_refsource_MLIST
[announce] 20210623 Success at Apache: Security in Practice mailing-list, x_refsource_MLIST
[airflow-commits] 20210712 [GitHub] [airflow] ashb commented on pull request #16942: Relax version constraint on ``Flask-Appbuilder`` mailing-list, x_refsource_MLIST