Symfony 4.3.0 - 4.4.12, 5.0.0 - 5.1.4 RCE Vulnerability

Symfony is prone to a remote code execution vulnerability.

The CachingHttpClient class from the HttpClient Symfony component relies on the HttpCache class to handle requests. HttpCache uses internal headers like X-Body-Eval and X-Body-File to control the restoration of cached responses. The class was initially written with surrogate caching and ESI support in mind (all HTTP calls come from a trusted backend in that scenario). But when used by CachingHttpClient and if an attacker can control the response for a request being made by the CachingHttpClient, remote code execution is possible.

Symfony versions 4.3.0 to 4.4.12 and 5.0.0 to 5.1.4.

Checks if a vulnerable version is present on the target host.

Update to version 4.4.13, 5.1.5 or later.