Package Instance

Improper Input Validation
If an application passes unvalidated user input as the file for which MIME type validation should occur, then arbitrary arguments are passed to the underlying file command.

Unsafe methods in the Request class
The `Symfony\Component\HttpFoundation\Request` class provides a mechanism that ensures it does not trust HTTP header values coming from a "non-trusted" client. Unfortunately, it assumes that the remote address is always a trusted client if at least one trusted proxy is involved in the request; this allows a man-in-the-middle attack between the latest trusted proxy and the web server. The following methods are impacted: `getPort()`, `isSecure()`, `getHost()` and `getClientIps()`.

Routes behind a firewall are accessible even when not logged in
Symfony does not process URL encoded data consistently within the Routing and Security components, which allows remote attackers to bypass intended URI restrictions via a doubly encoded string.

Information Exporure
`Request::getHost()` poisoning vulnerability in Symfony.

Information Exposure
`Request::getClientIp()` gives access to client IP when the trust proxy mode is enabled.

Insufficient Session Expiration
The `PDOSessionHandler` class allows storing sessions on a PDO connection. Under some configurations and with a well-crafted payload, it was possible to do a denial of service on a Symfony application without too much resources.

Improper Authorization
Security issue when parsing the Authorization header.

Uncontrolled Resource Consumption
Denial of service with a malicious HTTP Host header.

URL Rewrite vulnerability
An issue in Symfony arises from support for a (legacy) IIS header that lets users override the path in the request URL via the `X-Original-URL` or `X-Rewrite-URL` HTTP request header. These headers are designed for IIS support, but it's not verified that the server is in fact running IIS, which means anybody who can send these requests to an application can trigger this. This affects `\Symfony\Component\HttpFoundation\Request::prepareRequestUri()` where `X-Original-URL` and `X_REWRITE_URL` are both used. The fix drops support for these methods so that they cannot be used as attack vectors such as web cache poisoning.