GHSA-whgv-8cg3-7hcm

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GHSA-whgv-8cg3-7hcm

Summary: Symphony Denial of Service Via Overlong Usernames

Details: 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.

References: https://nvd.nist.gov/vuln/detail/CVE-2016-4423, https://github.com/symfony/symfony/pull/18733, https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-http/CVE-2016-4423.yaml, https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security/CVE-2016-4423.yaml, https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2016-4423.yaml, https://github.com/symfony/symfony, https://symfony.com/blog/cve-2016-4423-large-username-storage-in-session, https://symfony.com/cve-2016-4423, http://www.debian.org/security/2016/dsa-3588