Package Instance

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.

Symfony vulnerable to open redirect via browser-sanitized URLs
### Description

The `Request` class, does not parse URI with special characters the same way browsers do. As a result, an attacker can trick a validator relying on the `Request` class to redirect users to another domain.

### Resolution

The `Request::create` methods now assert the URI does not contain invalid characters as defined by https://url.spec.whatwg.org/

The patch for this issue is available [here](https://github.com/symfony/symfony/commit/5a9b08e5740af795854b1b639b7d45b9cbfe8819) for branch 5.4.

### Credits

We would like to thank Sam Mush - IPASSLab && ZGC Lab for reporting the issue and Nicolas Grekas for providing the fix.

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.

Argument injection in a MimeTypeGuesser in Symfony
An issue was discovered in Symfony 2.8.0 through 2.8.50, 3.4.0 through 3.4.34, 4.2.0 through 4.2.11, and 4.3.0 through 4.3.7. 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. This is related to symfony/http-foundation (and symfony/mime in 4.3.x).

Symfony's incorrect parsing of PATH_INFO can lead to limited authorization bypass
The `Request` class improperly interprets some `PATH_INFO` in a way that leads to representing some URLs with a path that doesn't start with a `/`. This can allow bypassing some access control rules that are built with this `/`-prefix assumption.

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

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