CVE-2016-4423

Severity

50%

Complexity

99%

Confidentiality

48%

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.

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.

CVSS 3.0 Base Score 7.5. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

CVSS 2.0 Base Score 5. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P).

Overview

First reported 8 years ago

2016-06-01 22:59:00

Last updated 8 years ago

2016-06-03 14:50:00

Affected Software

SensioLabs Symfony 2.7.0

2.7.0

SensioLabs Symfony 2.7.1

2.7.1

SensioLabs Symfony 2.7.2

2.7.2

SensioLabs Symfony 2.7.3

2.7.3

SensioLabs Symfony 2.7.4

2.7.4

SensioLabs Symfony 2.7.5

2.7.5

SensioLabs Symfony 2.7.6

2.7.6

SensioLabs Symfony 2.7.7

2.7.7

SensioLabs Symfony 2.7.8

2.7.8

SensioLabs Symfony 2.7.9

2.7.9

SensioLabs Symfony 2.7.10

2.7.10

SensioLabs Symfony 2.7.11

2.7.11

SensioLabs Symfony 2.7.12

2.7.12

SensioLabs Symfony 2.8.0

2.8.0

SensioLabs Symfony 2.8.1

2.8.1

SensioLabs Symfony 2.8.2

2.8.2

SensioLabs Symfony 2.8.3

2.8.3

SensioLabs Symfony 2.8.4

2.8.4

SensioLabs Symfony 2.8.5

2.8.5

SensioLabs Symfony 3.0.0

3.0.0

SensioLabs Symfony 3.0.1

3.0.1

SensioLabs Symfony 3.0.2

3.0.2

SensioLabs Symfony 3.0.3

3.0.3

SensioLabs Symfony 3.0.4

3.0.4

SensioLabs Symfony 3.0.5

3.0.5

Debian Linux 8.0 (Jessie)

8.0

References

DSA-3588

https://github.com/symfony/symfony/pull/18733

https://symfony.com/blog/cve-2016-4423-large-username-storage-in-session

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