CVE-2021-21424
Description
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The ability to enumerate users was possible without relevant permissions due to different handling depending on whether the user existed or not when attempting to use the switch users functionality. We now ensure that 403s are returned whether the user exists or not if a user cannot switch to a user or if the user does not exist. The patch for this issue is available for branch 3.4.
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 Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 4.4.19+dfsg-2 |
| sid | Fixed | 4.4.19+dfsg-2 |
| forky | Fixed | 4.4.19+dfsg-2 |
| bullseye | Fixed | 4.4.19+dfsg-2 |
| bookworm | Fixed | 4.4.19+dfsg-2 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Packagist | symfony/security | >=5.0.0,<5.2.8 | 5.2.8 |
| Packagist | symfony/security-guard | >=2.8.0,<3.4.48 | 3.4.48 |
| Packagist | symfony/security-guard | >=4.0.0,<4.4.23 | 4.4.23 |
| Packagist | symfony/security-guard | >=5.0.0,<5.2.8 | 5.2.8 |
| Packagist | symfony/security-core | >=2.8.0,<3.4.48 | 3.4.48 |
| Packagist | symfony/security-core | >=4.0.0,<4.4.23 | 4.4.23 |
| Packagist | symfony/security-core | >=5.0.0,<5.2.8 | 5.2.8 |
| Packagist | lexik/jwt-authentication-bundle | >=2.0.0,<2.10.7 | 2.10.7 |
| Packagist | lexik/jwt-authentication-bundle | >=2.11.0,<2.11.3 | 2.11.3 |
| Packagist | symfony/maker-bundle | >=1.27.0,<1.29.2 | 1.29.2 |
| Packagist | symfony/maker-bundle | >=1.30.0,<1.31.1 | 1.31.1 |
| Packagist | symfony/security-http | >=5.1.0,<5.2.8 | 5.2.8 |
| Packagist | symfony/security | >=2.8.0,<3.4.49 | 3.4.49 |
| Packagist | symfony/security | >=4.0.0,<4.4.24 | 4.4.24 |
| Packagist | symfony/symfony | >=2.8.0,<3.4.49 | 3.4.49 |
| Packagist | symfony/symfony | >=4.0.0,<4.4.24 | 4.4.24 |
| Packagist | symfony/symfony | >=5.0.0,<5.2.9 | 5.2.9 |
References
- 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
- https://security-tracker.debian.org/tracker/CVE-2021-21424
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.