GHSA-754h-5r27-7x3r RCE in Symfony

• Packagist symfony/http-kernel: >= 4.3.0, < 4.4.13 → fixed in 4.4.13 • Packagist symfony/http-kernel: >= 5.0.0, < 5.1.5 → fixed in 5.1.5 • Packagist symfony/symfony: >= 4.3.0, < 4.4.13 → fixed in 4.4.13 • Packagist symfony/symfony: >= 5.0.0, < 5.1.5 → fixed in 5.1.5

Description ----------- 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. Resolution ---------- HTTP headers designed for internal use in `HttpCache` are now stripped from remote responses before being passed to `HttpCache`. The patch for this issue is available here for the 4.4 branch. Credits ------- I would like to thank Matthias Pigulla (webfactory GmbH) for reporting and fixing the issue.