CVE-2021-21424

2021-05-1300:00:00

ubuntu.com

cve-2021-21424

php framework

web applications

console applications

user enumeration

permissions

switch users functionality

403 error

patch

branch 3.4

security vulnerability

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS3

5.3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS

0.001

Percentile

47.8%

JSON

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.

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchsymfony< 3.4.6+dfsg-1ubuntu0.1+esm2UNKNOWN
ubuntu20.04noarchsymfony< 4.3.8+dfsg-1ubuntu1+esm1UNKNOWN