| Name | CVE-2020-5255 |
| 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'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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more) |
| NVD severity | medium |
| Debian Bugs | 961415 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| symfony (PTS) | jessie | 2.3.21+dfsg-4+deb8u3 | fixed |
| jessie (security) | 2.3.21+dfsg-4+deb8u6 | fixed | |
| stretch (security), stretch | 2.8.7+dfsg-1.3+deb9u3 | fixed | |
| buster, buster (security) | 3.4.22+dfsg-2+deb10u1 | fixed | |
| bullseye, sid | 4.4.8-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| symfony | source | (unstable) | 4.4.8-1 | 961415 | ||
| symfony | source | buster | (not affected) | |||
| symfony | source | jessie | (not affected) | |||
| symfony | source | stretch | (not affected) |
[buster] - symfony <not-affected> (Introduced in 4.4.0)
[stretch] - symfony <not-affected> (Introduced in 4.4.0)
[jessie] - symfony <not-affected> (Introduced in 4.4.0)
https://symfony.com/blog/cve-2020-5255-prevent-cache-poisoning-via-a-response-content-type-header
https://github.com/symfony/symfony/commit/dca343442e6a954f96a2609e7b4e9c21ed6d74e6