Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
An issue was discovered in Symfony before 2.7.38, 2.8.x before 2.8.31, 3.x.x before 3.2.14, 3.3.x before 3.3.13, 3.4.x before 3.4.0-RC1, and 4.x.x before 4.0.0-RC1. The Intl component includes various bundle readers that are used to read resource bundles from the local filesystem. The read() methods of these classes use a path and a locale to determine the language bundle to retrieve. The locale argument value is commonly retrieved from untrusted user input (like a URL parameter). An attacker can use this argument to navigate to arbitrary directories via the dot-dot-slash attack, aka Directory Traversal.
CWE-22 - Path Traversal
Path traversal (or directory traversal), is a vulnerability that allows malicious users to traverse the server's root directory, gaining access to arbitrary files and folders such as application code & data, back-end credentials, and sensitive operating system files. In the worst-case scenario, an attacker could potentially execute arbitrary files on the server, resulting in a denial of service attack. Such an exploit may severely impact the integrity, confidentiality, and availability of an application.