Resource management error in Symfony and Debian Linux - CVE-2016-4423
Published: June 1, 2016 / Updated: August 9, 2020
Vulnerability identifier: #VU40253
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2016-4423
CWE-ID: CWE-399
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The attemptAuthentication function in Component/Security/Http/Firewall/UsernamePasswordFormAuthenticationListener.php in Symfony before 2.3.41, 2.7.x before 2.7.13, 2.8.x before 2.8.6, and 3.0.x before 3.0.6 does not limit the length of a username stored in a session, which allows remote attackers to cause a denial of service (session storage consumption) via a series of authentication attempts with long, non-existent usernames.
Affected software
Symfony
Debian Linux
Fedora
php-symfony
Debian Linux
Fedora
php-symfony
How to mitigate CVE-2016-4423
Install update from vendor's website.
php-symfony - update to 2.3.42-1.el6