Observable response discrepancy in Symfony - CVE-2021-21424

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Main Vulnerability Database Vulnerabilities #VU53200

Observable response discrepancy in Symfony - CVE-2021-21424

Published: May 12, 2021


Vulnerability identifier: #VU53200
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-21424
CWE-ID: CWE-204
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to enumerate application users.

The vulnerability exists due to application returns different responses based on presence of user account name in application database. A remote attacker enumerate application users.


Affected software

Symfony
Fedora
php-symfony3
php-symfony4

How to mitigate CVE-2021-21424

Install updates from vendor's website.

Symfony - addressed in versions 3.4.48, 4.4.23, 5.2.8
php-symfony3 - addressed in versions 3.4.48-1.fc32, 3.4.48-1.fc33, 3.4.48-1.fc34, 3.4.49-1.fc32, 3.4.49-1.fc33, 3.4.49-1.fc34
php-symfony4 - addressed in versions 4.4.23-1.fc33, 4.4.23-1.fc34, 4.4.24-1.fc33, 4.4.24-1.fc34

External References

Related Security Bulletins