CVE-2006-5716 in FreeNews
Summary
by MITRE
Directory traversal vulnerability in aff_news.php in FreeNews 2.1 allows remote attackers to include local files via a .. (dot dot) sequence in the chemin parameter, when the aff_news parameter is not set to "1."
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Analysis
by VulDB Data Team • 04/26/2026
The vulnerability identified as CVE-2006-5716 represents a critical directory traversal flaw in the FreeNews 2.1 content management system that exposes systems to remote code execution risks. This vulnerability specifically affects the aff_news.php script where improper input validation allows attackers to manipulate file inclusion mechanisms through crafted URL parameters. The flaw manifests when the chemin parameter contains directory traversal sequences such as .. (dot dot) characters, enabling unauthorized access to local files on the server filesystem.
The technical implementation of this vulnerability stems from insufficient sanitization of user-supplied input in the chemin parameter. When the aff_news parameter is not explicitly set to "1", the application fails to properly validate or sanitize the chemin input, creating an opportunity for attackers to traverse the file system hierarchy. This allows malicious actors to include arbitrary local files, potentially leading to sensitive data exposure, system compromise, or full command execution depending on the server configuration and file permissions. The vulnerability operates at the application layer and can be exploited through HTTP requests without requiring authentication.
The operational impact of CVE-2006-5716 extends beyond simple information disclosure, as it provides attackers with the capability to execute arbitrary code on vulnerable systems. This represents a severe security risk that can result in complete system compromise, data theft, or service disruption. The vulnerability affects web applications running FreeNews 2.1 and similar PHP-based content management systems that employ similar file inclusion patterns without proper input validation. Attackers can leverage this flaw to access configuration files, database credentials, user information, and potentially gain shell access to the underlying operating system.
Security professionals should implement multiple layers of defense to mitigate this vulnerability, beginning with immediate patching of affected FreeNews installations to version 2.2 or later where the issue has been resolved. Input validation and sanitization should be enforced at all application entry points, particularly for file inclusion parameters. The principle of least privilege should be applied to web server processes, limiting their access to only necessary system resources. Additionally, implementing web application firewalls and intrusion detection systems can help detect and prevent exploitation attempts. This vulnerability aligns with CWE-22 - Improper Limitation of a Pathname to a Restricted Directory and maps to ATT&CK technique T1505.003 - Server Software Component for exploitation through malicious file inclusion attacks. Organizations should conduct comprehensive vulnerability assessments to identify similar directory traversal vulnerabilities in other applications and ensure proper input validation across all file handling mechanisms.