Vulnerability Details : CVE-2016-4423
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.
Vulnerability category: Denial of service
Products affected by CVE-2016-4423
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.3:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.2:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.4:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.5:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.0:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.1:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.6:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.7:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.8:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.8.1:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.8.2:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.8.3:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:3.0.4:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:3.0.5:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.8.4:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.8.5:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:3.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:3.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.8.0:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:3.0.2:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:3.0.3:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.12:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.9:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.11:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.10:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2016-4423
1.05%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 82 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2016-4423
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:N/A:P |
10.0
|
2.9
|
NIST | |
7.5
|
HIGH | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2016-4423
-
Assigned by: nvd@nist.gov (Primary)
References for CVE-2016-4423
-
https://github.com/symfony/symfony/pull/18733
limited the maximum length of a submitted username by fabpot · Pull Request #18733 · symfony/symfony · GitHub
-
http://www.debian.org/security/2016/dsa-3588
Debian -- Security Information -- DSA-3588-1 symfony
-
https://symfony.com/blog/cve-2016-4423-large-username-storage-in-session
CVE-2016-4423: Large username storage in session (Symfony Blog)Vendor Advisory
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