ubuntu-cve-2016-4423
Vulnerability from osv_ubuntu
Published
2016-06-01 22:59
Modified
2025-10-24 04:45
Summary
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.

Severity
7.5 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "php-symfony-asset",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-browser-kit",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-class-loader",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-config",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-console",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-css-selector",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-debug",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-debug-bundle",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-dependency-injection",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-doctrine-bridge",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-dom-crawler",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-event-dispatcher",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-expression-language",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-filesystem",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-finder",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-form",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-framework-bundle",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-http-foundation",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-http-kernel",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-intl",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-locale",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-monolog-bridge",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-options-resolver",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-phpunit-bridge",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-process",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-property-access",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-proxy-manager-bridge",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-routing",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-security",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-security-bundle",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-serializer",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-stopwatch",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-swiftmailer-bridge",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-templating",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-translation",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-twig-bridge",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-twig-bundle",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-validator",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-var-dumper",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-web-profiler-bundle",
            "binary_version": "2.7.10-0ubuntu2"
          },
          {
            "binary_name": "php-symfony-yaml",
            "binary_version": "2.7.10-0ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "symfony",
        "purl": "pkg:deb/ubuntu/symfony@2.7.10-0ubuntu2?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.7.1+dfsg-1",
        "2.7.5+dfsg-1",
        "2.7.9+dfsg-1",
        "2.7.9+dfsg-1ubuntu2",
        "2.7.10-0ubuntu2"
      ]
    }
  ],
  "aliases": [],
  "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.",
  "id": "UBUNTU-CVE-2016-4423",
  "modified": "2025-10-24T04:45:45Z",
  "published": "2016-06-01T22:59:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2016-4423"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/symfony/symfony/pull/18733"
    },
    {
      "type": "REPORT",
      "url": "https://symfony.com/blog/cve-2016-4423-large-username-storage-in-session"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2016-4423"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2016-4423"
  ]
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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Detection rules are retrieved from Rulezet.