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

Quick assessment

Affected
dpgaspar Flask-AppBuilder
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Flask-AppBuilder是一个简单快速的应用程序开发框架。 Flask- appbuilder 存在安全漏洞，该漏洞源于Flask-AppBuilder <= 3.2.3缺少身份验证措施或身份验证强度不足。攻击者可利用该漏洞允许未经身份验证的用户在登录时通过计时服务器的响应时间枚举现有帐户。

CVSS 5.3 · Medium EPSS 3.40% · P89

Possible ATT&CK Techniques 1 AI

T1087 · Account Discovery
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I. Basic Information for CVE-2021-29621

Vulnerability Information
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Vulnerability Title
Observable Response Discrepancy in Flask-AppBuilder
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Flask-AppBuilder安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Flask-AppBuilder是一个简单快速的应用程序开发框架。 Flask- appbuilder 存在安全漏洞，该漏洞源于Flask-AppBuilder <= 3.2.3缺少身份验证措施或身份验证强度不足。攻击者可利用该漏洞允许未经身份验证的用户在登录时通过计时服务器的响应时间枚举现有帐户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
dpgaspar Flask-AppBuilder < 3.3.0 -

II. Public POCs for CVE-2021-29621

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III. Intelligence Information for CVE-2021-29621

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Patches & Fixes for CVE-2021-29621 (1)

Vendor Advisories for CVE-2021-29621 (1)

Mailing List Discussions for CVE-2021-29621 (3)

Other References for CVE-2021-29621 (1)

IV. Related Vulnerabilities

Same product: Flask-AppBuilder
Same vendor: dpgaspar
Same weakness: CWE-203

V. Comments for CVE-2021-29621

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