CVE-2020-5255 Information

Description

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 Accept header of the request leading to a possible mismatch between the response&39;s content and Content-Type header. When the response is cached this can prevent the use of the website by other users. This has been patched in versions 4.4.7 and 5.0.7.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Reference

https://github.com/symfony/symfony/commit/dca343442e6a954f96a2609e7b4e9c21ed6d74e6 https://github.com/symfony/symfony/security/advisories/GHSA-mcx4-f5f5-4859 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/C36JLPHUPKDFAX6D5WYFC4ALO2K7RDUQ/ https://symfony.com/blog/cve-2020-5255-prevent-cache-poisoning-via-a-response-content-type-header

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

LOW

Base Severity

4.3