CVE-2011-3777 in phpFreeChat
Summary
by MITRE
phpFreeChat 1.3 allows remote attackers to obtain sensitive information via a direct request to a .php file, which reveals the installation path in an error message, as demonstrated by themes/zilveer/style.css.php and certain other files.
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Analysis
by VulDB Data Team • 02/10/2019
The vulnerability identified as CVE-2011-3777 affects phpFreeChat version 1.3 and represents a sensitive data exposure issue that fundamentally compromises the security posture of affected systems. This vulnerability stems from improper error handling within the application's file structure, where direct access to specific php files reveals critical system information including installation paths. The flaw specifically manifests when attackers make direct requests to .php files within the application's directory structure, particularly targeting files such as themes/zilveer/style.css.php and similar components. This type of information disclosure vulnerability directly violates security best practices by exposing system internals that should remain hidden from external entities.
The technical implementation of this vulnerability resides in the application's error handling mechanisms and file access controls. When phpFreeChat encounters a direct request to certain php files, it fails to properly validate or sanitize the request, instead returning detailed error messages that contain the absolute installation path of the application on the server. This occurs because the application's configuration does not adequately restrict access to internal php files that are meant to be included or processed rather than accessed directly. The vulnerability operates at the application layer, specifically within the web application's file inclusion and access control logic, making it a classic example of insecure direct object reference or improper access control. From a cybersecurity perspective, this vulnerability falls under CWE-200, which specifically addresses information exposure, and represents a fundamental breakdown in the principle of least privilege.
The operational impact of CVE-2011-3777 extends beyond simple information disclosure, as the revealed installation paths provide attackers with critical intelligence for subsequent attacks. Knowledge of the absolute file paths enables attackers to craft more sophisticated exploitation techniques, including potential directory traversal attacks, file inclusion vulnerabilities, or targeted attacks against specific application components. The exposure of system paths can facilitate further reconnaissance activities, allowing threat actors to map the application's internal structure and identify potential attack vectors. This vulnerability aligns with ATT&CK technique T1083, which covers the discovery of system information through directory listing and file enumeration activities. Organizations running vulnerable versions of phpFreeChat face increased risk of compromise, as this information disclosure can serve as a launching point for more serious attacks including privilege escalation, data exfiltration, or complete system compromise.
Mitigation strategies for CVE-2011-3777 require immediate implementation of proper access controls and error handling mechanisms. The primary remediation involves configuring the web server to prevent direct access to php files that are intended for internal processing only, through proper directory permissions, .htaccess rules, or similar access control mechanisms. Additionally, implementing comprehensive error handling that does not expose system paths or internal file structures is essential. Organizations should also consider implementing input validation and sanitization for all file access requests, ensuring that the application properly validates and restricts access to its internal components. Regular security assessments and code reviews should be conducted to identify similar vulnerabilities in the application's architecture, while maintaining up-to-date versions of phpFreeChat or migrating to more secure alternatives. The vulnerability demonstrates the critical importance of proper error handling and access control in web applications, as even seemingly minor flaws can provide significant attack surface expansion opportunities.