CVE-2009-0453 in Online Grades
Summary
by MITRE
Online Grades 3.2.4 allows remote attackers to obtain configuration information via a direct request to phpinfo.php, which calls the phpinfo function.
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Analysis
by VulDB Data Team • 11/23/2024
The vulnerability identified as CVE-2009-0453 affects Online Grades version 3.2.4, a web-based academic management system that facilitates grade tracking and reporting. This flaw represents a critical information disclosure vulnerability that exposes sensitive system configuration details to unauthorized remote attackers. The vulnerability stems from the application's improper handling of direct requests to a specific file named phpinfo.php, which is typically used for debugging and system information purposes. When an attacker accesses this file directly, the application executes the phpinfo function, which outputs detailed server configuration data including PHP settings, loaded modules, environment variables, and potentially sensitive system information that should remain protected.
The technical nature of this vulnerability aligns with CWE-200, which describes information exposure, and represents a classic case of insecure direct object reference where the application fails to properly authenticate or authorize access to sensitive system information files. The phpinfo function in PHP is designed for development and debugging purposes, but when exposed to public access, it becomes a goldmine of information for attackers. This includes details about the server's operating system, PHP version, loaded extensions, database connection parameters, and potentially other sensitive configuration settings that could be leveraged for further exploitation. The vulnerability exists because the application lacks proper access controls or authentication mechanisms for the phpinfo.php file, making it accessible to any remote user who knows the file path.
From an operational impact perspective, this vulnerability creates significant risks for organizations using the Online Grades system, as it provides attackers with comprehensive insights into the underlying infrastructure and application configuration. The leaked information could enable attackers to craft more sophisticated attacks by identifying specific PHP versions, installed modules, and system configurations that may have additional vulnerabilities. Security researchers and attackers can use this information to determine if the system is running vulnerable versions of PHP extensions or if it has known security weaknesses. The exposure of database connection details, server paths, and configuration parameters significantly increases the attack surface and can lead to privilege escalation, data breaches, or complete system compromise. This vulnerability particularly impacts organizations in educational environments where grade data and student information are handled, making the potential for data exposure and privacy violations especially concerning.
The recommended mitigation strategies for this vulnerability include immediate removal or renaming of the phpinfo.php file from the web-accessible directory structure, implementation of proper access controls and authentication mechanisms, and configuration of web server permissions to prevent direct access to sensitive files. Organizations should also conduct comprehensive security reviews of all web applications to identify similar vulnerabilities, implement proper input validation and access control measures, and ensure that debugging files are not accessible in production environments. Additionally, regular security assessments and penetration testing should be conducted to identify and remediate similar information disclosure vulnerabilities. This vulnerability demonstrates the importance of following secure coding practices and adhering to the principle of least privilege, where sensitive system information should never be exposed to unauthorized users. The remediation process should also include monitoring web server access logs for suspicious activity related to the phpinfo.php file and implementing web application firewalls to detect and block unauthorized access attempts to sensitive system files.