Prevent user enumeration using Guard or the new Authenticator-based Security
Description
The ability to enumerate users was possible without relevant permissions due to different exception messages depending on whether the user existed or not. It was also possible to enumerate users by using a timing attack, by comparing time elapsed when authenticating an existing user and authenticating a non-existing user.
Resolution
We now ensure that 403s are returned whether the user exists or not if the password is invalid or if the user does not exist.
The patch for this issue is available here for branch 3.4.
Credits
I would like to thank James Isaac and Mathias Brodala for reporting the issue and Robin Chalas for fixing the issue.
Software afectado
Haz clic en una tecnología para ver todas sus vulnerabilidades.
| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de Composer | lexik/jwt-authentication-bundle | >= 2.0.0, < 2.10.7, >= 2.11.0, < 2.11.3 | 2.10.7, 2.11.3 |
| Paquete de Composer | symfony/maker-bundle | >= 1.27.0, < 1.29.2, >= 1.30.0, < 1.31.1 | 1.29.2, 1.31.1 |
| Paquete de Composer | symfony/security | >= 5.0.0, < 5.2.8, >= 2.8.0, < 3.4.49, >= 4.0.0, < 4.4.24 | 5.2.8, 3.4.49, 4.4.24 |
| Paquete de Composer | symfony/security-core | >= 2.8.0, < 3.4.48, >= 4.0.0, < 4.4.23, >= 5.0.0, < 5.2.8 | 3.4.48, 4.4.23, 5.2.8 |
| Paquete de Composer | symfony/security-guard | >= 2.8.0, < 3.4.48, >= 4.0.0, < 4.4.23, >= 5.0.0, < 5.2.8 | 3.4.48, 4.4.23, 5.2.8 |
| Paquete de Composer | symfony/security-http | >= 5.1.0, < 5.2.8 | 5.2.8 |
| Paquete de Composer | symfony/symfony | >= 2.8.0, < 3.4.49, >= 4.0.0, < 4.4.24, >= 5.0.0, < 5.2.9 | 3.4.49, 4.4.24, 5.2.9 |
Referencias
- https://github.com/symfony/symfony/security/advisories/GHSA-5pv8-ppvj-4h68
- https://nvd.nist.gov/vuln/detail/CVE-2021-21424
- https://github.com/symfony/symfony/commit/2a581d22cc621b33d5464ed65c4bc2057f72f011
- https://symfony.com/cve-2021-21424
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VRUS2H2SSOQWNLBD35SKIWIDQEMV2PD3
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UC7BND775DVZDQT3RMGD2HVB2PKLJDJW
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RH7TMM5CHQYBFFGXWRPJDPB3SKCZXI2M
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KENRNLB3FYXYGDWRBH2PDBOZZKOD7VY4
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VRUS2H2SSOQWNLBD35SKIWIDQEMV2PD3
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UC7BND775DVZDQT3RMGD2HVB2PKLJDJW
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RH7TMM5CHQYBFFGXWRPJDPB3SKCZXI2M
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KENRNLB3FYXYGDWRBH2PDBOZZKOD7VY4
- https://lists.debian.org/debian-lts-announce/2023/07/msg00014.html
- https://github.com/symfony/symfony
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2021-21424.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security/CVE-2021-21424.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-http/CVE-2021-21424.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-guard/CVE-2021-21424.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/maker-bundle/CVE-2021-21424.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/lexik/jwt-authentication-bundle/CVE-2021-21424.yaml
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N- Debilidad (CWE)
CWE-200, CWE-203- Plataforma
- Composer
- Paquete
lexik/jwt-authentication-bundle, symfony/maker-bundle, symfony/security- Publicada
- 13.05.2021
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-5pv8-ppvj-4h68 - CC BY 4.0
Historial de vulnerabilidades: symfony/security-http
Todas las vulnerabilidades publicadas de este paquete (Paquete de Composer), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 20
- Primera → última
- 12.2019 06.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 10
- Media 8
- Baja 2
Divulgaciones por año
- 2019: 1
- 2020: 2
- 2021: 3
- 2022: 7
- 2023: 1
- 2024: 1
- 2025: 0
- 2026: 5
-
Prevent user enumeration using Guard or the new Authenticator-based Security esta entrada
Identifica las vulnerabilidades de tu aplicación
Con la integración de DockRay y el inventario de software activado, DockRay compara las versiones notificadas de los componentes con las vulnerabilidades conocidas y avisa de las coincidencias confirmadas. La cobertura depende de la tecnología compatible y de los avisos disponibles.