Twig Log Exposure Scanner

Scanner is typically utilized by developers and security professionals who work with Twig templates to ensure the security of web applications. Twig is a templating engine for PHP, used to design HTML documents in a structured format. Organizations that use PHP in their web applications integrate Twig for its flexibility and ease of use. It's employed in various industries for creating dynamic web pages while maintaining a clean separation between logic and presentation. This scanner checks vulnerabilities to ensure that Twig configurations are secure and that errors do not expose sensitive information. The tool is critical for maintaining security in web development and testing environments.

The vulnerability detected by this scanner pertains to the exposure of runtime errors in the Twig template engine. A Twig Runtime Error can disclose critical information about the server environment, application structure, and file paths. Such exposure occurs when error messages are not properly handled and are displayed to the user, which may happen in a development or incorrectly configured production environment. Unhandled runtime errors can serve as a starting point for attackers to gather information for further exploitation. Protecting these errors from exposure is crucial to maintaining application security. This vulnerability emphasizes the need for strict error handling and configuration practices.

The vulnerability details involve examining how the Twig template engine reports errors during execution. The scanner targets the endpoints where such runtime errors are likely to be displayed, focusing on the 'Twig Runtime Error – Twig\Error\RuntimeError' signature. It checks for HTTP 500 status codes associated with these error messages, indicating potential log exposure. Understanding the specific conditions under which these errors are exposed helps in pinpointing the vulnerability source. The parameters that could lead to runtime errors might include variables within templates that are not correctly managed. Identifying these misconfigurations can guide developers to remediate the issue, ensuring runtime errors are not revealed.

The potential effects of exploiting this vulnerability include unauthorized access to sensitive information that could facilitate more significant breaches. An attacker with access to Twig runtime errors can gather information about the application's file structure, software versions, and error codes, which can be used for further exploits like code injection or privilege escalation. This exposure can compromise the confidentiality, integrity, and availability of the web application. Consequent attacks might lead to data theft, service disruption, or the deployment of malicious scripts. Regular reviews and proper error handling configurations are vital for preventing such issues.

REFERENCES

• https://twig.symfony.com/