CVE-2018-19789
Description
An issue was discovered in Symfony 2.7.x before 2.7.50, 2.8.x before 2.8.49, 3.x before 3.4.20, 4.0.x before 4.0.15, 4.1.x before 4.1.9, and 4.2.x before 4.2.1. When using the scalar type hint `string` in a setter method (e.g. `setName(string $name)`) of a class that's the `data_class` of a form, and when a file upload is submitted to the corresponding field instead of a normal text input, then `UploadedFile::__toString()` is called which will then return and disclose the path of the uploaded file. If combined with a local file inclusion issue in certain circumstances this could escalate it to a Remote Code Execution.
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 | 3.4.20+dfsg-1 |
| sid | Fixed | 3.4.20+dfsg-1 |
| forky | Fixed | 3.4.20+dfsg-1 |
| bullseye | Fixed | 3.4.20+dfsg-1 |
| bookworm | Fixed | 3.4.20+dfsg-1 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Packagist | symfony/symfony | >=2.7.0,<2.7.50 | 2.7.50 |
| Packagist | symfony/symfony | >=2.8.0,<2.8.49 | 2.8.49 |
| Packagist | symfony/symfony | >=3.0.0,<3.4.20 | 3.4.20 |
| Packagist | symfony/symfony | >=4.0.0,<4.0.15 | 4.0.15 |
| Packagist | symfony/symfony | >=4.1.0,<4.1.9 | 4.1.9 |
| Packagist | symfony/symfony | >=4.2.0,<4.2.1 | 4.2.1 |
| Packagist | symfony/form | >=2.7.0,<2.7.50 | 2.7.50 |
| Packagist | symfony/form | >=2.8.0,<2.8.49 | 2.8.49 |
| Packagist | symfony/form | >=3.0.0,<3.4.20 | 3.4.20 |
| Packagist | symfony/form | >=4.0.0,<4.0.15 | 4.0.15 |
| Packagist | symfony/form | >=4.1.0,<4.1.9 | 4.1.9 |
| Packagist | symfony/form | >=4.2.0,<4.2.1 | 4.2.1 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2018-19789
- https://github.com/symfony/symfony/commit/b65e6f1a47b68f2713b60cdac9cc3a4af62a2d1c
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/form/CVE-2018-19789.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2018-19789.yaml
- https://github.com/symfony/symfony
- https://lists.debian.org/debian-lts-announce/2019/03/msg00009.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4TD3E7FZIXLVFG3SMFJPDEKPZ26TJOW7
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JZMRJ7VTHCY5AZK24G4QGX36RLUDTDKE
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OA4WVFN5FYPIXAPLWZI6N425JHHDSWAZ
- https://seclists.org/bugtraq/2019/May/21
- https://symfony.com/blog/cve-2018-19789-disclosure-of-uploaded-files-full-path
- https://symfony.com/cve-2018-19789
- https://web.archive.org/web/20210124224817/http://www.securityfocus.com/bid/106249
- https://www.debian.org/security/2019/dsa-4441
- https://security-tracker.debian.org/tracker/CVE-2018-19789
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.