🛡️ GHSA-vfm6-r2gc-pwww — http-foundation

Symfony2 security issue when the trust proxy mode is enabled

An application is vulnerable if it uses the client IP address as returned by the Request::getClientIp() method for sensitive decisions like IP based access control.

To fix this security issue, the following changes have been made to all versions of Symfony2:

A new Request::setTrustedProxies() method has been introduced and should be used intead of Request::trustProxyData() to enable the trust proxy mode. It takes an array of trusted proxy IP addresses as its argument:

```

// before (probably in your front controller script)

Request::trustProxyData();

// after

Request::setTrustedProxies(array('1.1.1.1'));

// 1.1.1.1 being the IP address of a trusted reverse proxy

```

The Request::trustProxyData() method has been deprecated (when used, it automatically trusts the latest proxy in the chain -- which is the current remote address):

```

Request::trustProxyData();

// is equivalent to

Request::setTrustedProxies(array($request->server->get('REMOTE_ADDR')));

```

We encourage all Symfony2 users to upgrade as soon as possible. It you don't want to upgrade to the latest version yet, you can also apply the following patches:

• [Patch](https://github.com/symfony/symfony/compare/fc89d6b...9ce892c.patch) for Symfony 2.0.19
• [Patch](https://github.com/symfony/symfony/compare/922c201...e5536f0.patch) for Symfony 2.1.4