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CVE-2021-21424— Prevent user enumeration using Guard or the new Authenticator-based Security

Quick assessment

Affected
symfony symfony
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Sensio Labs Symfony是法国Sensio Labs公司的一套免费的、基于MVC架构的PHP开发框架。该框架提供常用的功能组件及工具，可用于快速创建复杂的WEB程序。 Symfony 存在安全漏洞。该漏洞源于应用程序基于应用程序数据库中用户帐户名的存在而返回不同的响应。远程攻击者枚举应用程序用户。以下产品及版本受到影响：Symfony: 3.0.0, 3.0.0-1, 3.0.01, 3.0.1, 3.0.2, 3.0.3, 3.0.4, 3.0.5, 3.0.6, 3.0.7, 3.0.8

CVSS 5.3 · Medium EPSS 1.71% · P77

Possible ATT&CK Techniques 1 AI

T1098 · Account Manipulation
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I. Basic Information for CVE-2021-21424

Vulnerability Information
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Vulnerability Title
Prevent user enumeration using Guard or the new Authenticator-based Security
Source: CVE Program / CVE List V5
Vulnerability Description
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The ability to enumerate users was possible without relevant permissions due to different handling depending on whether the user existed or not when attempting to use the switch users functionality. We now ensure that 403s are returned whether the user exists or not if a user cannot switch to a user or if the user does not exist. The patch for this issue is available for branch 3.4.
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
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Sensio Labs Symfony 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Sensio Labs Symfony是法国Sensio Labs公司的一套免费的、基于MVC架构的PHP开发框架。该框架提供常用的功能组件及工具，可用于快速创建复杂的WEB程序。 Symfony 存在安全漏洞。该漏洞源于应用程序基于应用程序数据库中用户帐户名的存在而返回不同的响应。远程攻击者枚举应用程序用户。以下产品及版本受到影响：Symfony: 3.0.0, 3.0.0-1, 3.0.01, 3.0.1, 3.0.2, 3.0.3, 3.0.4, 3.0.5, 3.0.6, 3.0.7, 3.0.8
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
symfony symfony >= 2.8.0, < 3.4.48 -

II. Public POCs for CVE-2021-21424

# POC Description Source Link Shenlong Link
1 El WebProfiler de Symfony expone rutas internas del servidor si no está deshabilitado en producción https://github.com/moften/CVE-2021-21424 POC Details
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III. Intelligence Information for CVE-2021-21424

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Patches & Fixes for CVE-2021-21424 (1)

Vendor Advisories for CVE-2021-21424 (1)

Mailing List Discussions for CVE-2021-21424 (5)

IV. Related Vulnerabilities

Same product: symfony
Same vendor: symfony
Same weakness: CWE-200

V. Comments for CVE-2021-21424

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