CVE-2016-4423
Description
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Debian Mixed 6 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 2.8.6+dfsg-1 |
| sid | Fixed | 2.8.6+dfsg-1 |
| forky | Fixed | 2.8.6+dfsg-1 |
| bullseye | Fixed | 2.8.6+dfsg-1 |
| bookworm | Fixed | 2.8.6+dfsg-1 |
| 8.0 | Affected | — |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Packagist | symfony/security-http | >=2.3.0,<2.3.41 | 2.3.41 |
| Packagist | symfony/security-http | >=2.4.0,<2.7.13 | 2.7.13 |
| Packagist | symfony/security-http | >=2.8.0,<2.8.6 | 2.8.6 |
| Packagist | symfony/security-http | >=3.0.0,<3.0.6 | 3.0.6 |
| Packagist | symfony/security | >=2.3.0,<2.3.41 | 2.3.41 |
| Packagist | symfony/security | >=2.4.0,<2.7.13 | 2.7.13 |
| Packagist | symfony/security | >=2.8.0,<2.8.6 | 2.8.6 |
| Packagist | symfony/security | >=3.0.0,<3.0.6 | 3.0.6 |
| Packagist | symfony/symfony | >=2.3.0,<2.3.41 | 2.3.41 |
| Packagist | symfony/symfony | >=2.4.0,<2.7.13 | 2.7.13 |
| Packagist | symfony/symfony | >=2.8.0,<2.8.6 | 2.8.6 |
| Packagist | symfony/symfony | >=3.0.0,<3.0.6 | 3.0.6 |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| sensiolabs | symfony | {"endIncluding":"2.3.40"} | |
| 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 | |
References
- http://www.debian.org/security/2016/dsa-3588
- https://github.com/symfony/symfony/pull/18733
- https://symfony.com/blog/cve-2016-4423-large-username-storage-in-session
- https://nvd.nist.gov/vuln/detail/CVE-2016-4423
- 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/cve-2016-4423
- https://security-tracker.debian.org/tracker/CVE-2016-4423
CWEs
CWE-399
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.