Chrome Logger information disclosure

Chrome Logger is a debugging tool consisting of a browser extension and server-side component that enables developers to view server-side application logs directly in the Chrome browser console. When active, the server returns debugging data through HTTP response headers (X-ChromePhp-Data or X-ChromeLogger-Data) containing base64-encoded JSON with application state, variables, and log messages. This vulnerability occurs when Chrome Logger remains enabled in production environments, exposing internal application details to any client inspecting HTTP responses.

Exposure of Chrome Logger headers in production can leak sensitive technical information including application file paths, database queries, internal variable values, stack traces, configuration details, and business logic flow. Attackers can use this information to map the application architecture, identify additional vulnerabilities, craft targeted attacks, and gain insights into security controls. The severity increases if the logged data contains authentication tokens, API keys, user data, or other confidential information that could lead to unauthorized access or data breaches.

Disable Chrome Logger and all debugging tools in production environments immediately. Implement the following steps:

1. Remove or disable the Chrome Logger server-side library from production code. For PHP applications using ChromePhp:

// Remove or comment out in production // ChromePhp::log('debug message'); // require_once 'ChromePhp.php';

2. Configure environment-based conditional loading to ensure debugging tools only activate in development:

if (getenv('APP_ENV') === 'development') { // Enable Chrome Logger only in dev ChromePhp::log($debugData); }

3. Review web server and application configurations to ensure no debug headers are sent in production responses.
4. Implement automated security testing to detect debug headers in staging and production environments.
5. Establish deployment procedures that explicitly verify debugging tools are disabled before production releases.