// For flags

CVE-2021-21424

Prevent user enumeration using Guard or the new Authenticator-based Security

Severity Score

5.3
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

Symfony es un framework PHP para aplicaciones web y de consola y un conjunto de componentes PHP reutilizables. La capacidad de enumerar a los usuarios fue posible sin los permisos pertinentes debido al manejo diferente dependiendo de si el usuario existía o no al intentar usar la funcionalidad switch users. Ahora nos aseguramos de que los 403 sean retornados independientemente de que el usuario exista o no si un usuario no puede cambiar a un usuario o si el usuario no existe. El parche para este problema está disponible para la rama 3.4

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-12-22 CVE Reserved
  • 2021-05-13 CVE Published
  • 2024-01-27 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-203: Observable Discrepancy
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Sensiolabs
Search vendor "Sensiolabs"
 Symfony
Search vendor "Sensiolabs" for product "Symfony"
 >= 2.8.0 < 3.4.48
Search vendor "Sensiolabs" for product "Symfony" and version " >= 2.8.0 < 3.4.48"
-
Affected
Sensiolabs
Search vendor "Sensiolabs"
 Symfony
Search vendor "Sensiolabs" for product "Symfony"
 >= 4.0.0 < 4.4.23
Search vendor "Sensiolabs" for product "Symfony" and version " >= 4.0.0 < 4.4.23"
-
Affected
Sensiolabs
Search vendor "Sensiolabs"
 Symfony
Search vendor "Sensiolabs" for product "Symfony"
 >= 5.0.0 < 5.2.8
Search vendor "Sensiolabs" for product "Symfony" and version " >= 5.0.0 < 5.2.8"
-
Affected
Fedoraproject
Search vendor "Fedoraproject"
 Fedora
Search vendor "Fedoraproject" for product "Fedora"
 33
Search vendor "Fedoraproject" for product "Fedora" and version "33"
-
Affected
Fedoraproject
Search vendor "Fedoraproject"
 Fedora
Search vendor "Fedoraproject" for product "Fedora"
 34
Search vendor "Fedoraproject" for product "Fedora" and version "34"
-
Affected