FKIE_CVE-2016-4423

Vulnerability from fkie_nvd - Published: 2016-06-01 22:59 - Updated: 2026-05-06 22:30
Severity
7.5 (High) - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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
cve@mitre.orghttp://www.debian.org/security/2016/dsa-3588
cve@mitre.orghttps://github.com/symfony/symfony/pull/18733
cve@mitre.orghttps://symfony.com/blog/cve-2016-4423-large-username-storage-in-sessionVendor Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.debian.org/security/2016/dsa-3588
af854a3a-2127-422b-91ae-364da2661108https://github.com/symfony/symfony/pull/18733
af854a3a-2127-422b-91ae-364da2661108https://symfony.com/blog/cve-2016-4423-large-username-storage-in-sessionVendor Advisory
Impacted products
Vendor Product Version
sensiolabs symfony *
sensiolabs symfony 2.7.0
sensiolabs symfony 2.7.1
sensiolabs symfony 2.7.2
sensiolabs symfony 2.7.3
sensiolabs symfony 2.7.4
sensiolabs symfony 2.7.5
sensiolabs symfony 2.7.6
sensiolabs symfony 2.7.7
sensiolabs symfony 2.7.8
sensiolabs symfony 2.7.9
sensiolabs symfony 2.7.10
sensiolabs symfony 2.7.11
sensiolabs symfony 2.7.12
sensiolabs symfony 2.8.0
sensiolabs symfony 2.8.1
sensiolabs symfony 2.8.2
sensiolabs symfony 2.8.3
sensiolabs symfony 2.8.4
sensiolabs symfony 2.8.5
sensiolabs symfony 3.0.0
sensiolabs symfony 3.0.1
sensiolabs symfony 3.0.2
sensiolabs symfony 3.0.3
sensiolabs symfony 3.0.4
sensiolabs symfony 3.0.5
debian debian_linux 8.0
To clipboard 

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  "cveTags": [],
  "descriptions": [
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      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "La funci\u00f3n attemptAuthentication en Component/Security/Http/Firewall/UsernamePasswordFormAuthenticationListener.php en Symfony en versiones anteriores a 2.3.41, 2.7.x en versiones anteriores a 2.7.13, 2.8.x en versiones anteriores a 2.8.6 y 3.0.x en versiones anteriores a 3.0.6 no limita la longitud de un nombre de usuario almacenado en una sesi\u00f3n, lo que permite a atacantes remotos provocar una denegaci\u00f3n de servicio (consumo de almacenamiento de sesi\u00f3n) a trav\u00e9s de una series de intentos de autenticaci\u00f3n con nombres de usuario largos que no existen."
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  "id": "CVE-2016-4423",
  "lastModified": "2026-05-06T22:30:45.220",
  "metrics": {
    "cvssMetricV2": [
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        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
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          "baseScore": 5.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
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        "type": "Primary"
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  "published": "2016-06-01T22:59:02.457",
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.