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
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| 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
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
- 17
- Primera → última
- 02.2020 05.2022
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 3
- Alta 7
- Media 6
- Baja 1
Divulgaciones por año
- 2020: 2
- 2021: 1
- 2022: 14
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 0
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