Symfony 2.0.x before 2.0.20, 2.1.x before 2.1.5, and 2.2-dev, when the internal routes configuration is enabled, allows remote attackers to access arbitrary services via vectors involving a URI beginning with a /_internal substring.

References

• https://nvd.nist.gov/vuln/detail/CVE-2012-6432
• http://symfony.com/blog/security-release-symfony-2-0-20-and-2-1-5-released
• https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2012-6432.yaml
• https://symfony.com/blog/security-release-symfony-2-0-20-and-2-1-5-released