PILOS Information Disclosure Vulnerability Exposing PHP Version

A vulnerability in PILOS, a frontend for BigBlueButton, prior to version 4.8.0, allows for the unintentional disclosure of the PHP version via the X-Powered-By header. This exposure enables attackers to fingerprint the server and evaluate potential exploits. The vulnerability stems from PHP's base image. Furthermore, the PHP version can be inferred from the PILOS version shown in the footer or by reviewing the source code available on GitHub.

Impact

This vulnerability could lead to information disclosure, allowing attackers to identify the PHP version in use and potentially exploit version-specific vulnerabilities.

Remediation

Users can update to PILOS version 4.8.0 or later to address this vulnerability. Additionally, the X-Powered-By header can be removed at the reverse proxy level, with specific instructions available for Nginx and Apache.