Prevent cache poisoning via a Response Content-Type header in Symfony
Description ----------- When a `Response` does not contain a `Content-Type` header, Symfony falls back to the format defined in the `Accept` header of the request, leading to a possible mismatch between the response's content and `Content-Type` header. When the response is cached, this can lead to a corrupted cache where the cached format is not the right one. Resolution ---------- Symfony does not use the `Accept` header anymore to guess the `Content-Type`. The patch for this issue is available [here](https://github.com/symfony/symfony/commit/dca343442e6a954f96a2609e7b4e9c21ed6d74e6) for the 4.4 branch. Credits ------- I would like to thank Xavier Lacot from JoliCode for reporting & Yonel Ceruto and Tobias Schultze for fixing the issue.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2020-5255US | medium4.3 | — | ||
In Symfony before versions 4.4.7 and 5.0.7, when a `Response` does not contain a `Content-Type` header, affected versions of Symfony can fallback to the format defined in the `Acce… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-foundation/CVE-2020-5255.yamlWEB
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2020-5255.yamlWEB
- https://github.com/symfony/symfony/commit/dca343442e6a954f96a2609e7b4e9c21ed6d74e6WEB
- https://github.com/symfony/symfony/security/advisories/GHSA-mcx4-f5f5-4859WEB
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/C36JLPHUPKDFAX6D5WYFC4ALO2K7RDUQWEB
- https://nvd.nist.gov/vuln/detail/CVE-2020-5255ADVISORY
- https://symfony.com/blog/cve-2020-5255-prevent-cache-poisoning-via-a-response-content-type-headerWEB
- https://symfony.com/cve-2020-5255WEB
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