CVE-2007-3772 in PsNews
Summary
by MITRE
Directory traversal vulnerability in news/show.php in PsNews 1.1 allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the newspath parameter.
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Analysis
by VulDB Data Team • 09/25/2024
The CVE-2007-3772 vulnerability represents a classic directory traversal flaw in the PsNews 1.1 content management system that exposes systems to remote code execution through improper input validation. This vulnerability specifically affects the news/show.php script where the newspath parameter is processed without adequate sanitization, allowing malicious actors to manipulate file paths and access arbitrary local files on the server. The vulnerability stems from the application's failure to properly validate user-supplied input, creating an opportunity for attackers to navigate the file system beyond intended boundaries using the .. (dot dot) sequence commonly known as directory traversal or path traversal attacks. Such flaws fall under the CWE-22 category of Improper Limitation of a Pathname to a Restricted Directory, which is a fundamental security weakness in file system access controls.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious URL containing the newspath parameter with directory traversal sequences that bypass the intended file access restrictions. When the application processes this parameter, it concatenates the user input directly into file system operations without proper validation or sanitization, enabling access to sensitive files such as configuration files, database credentials, or system files that should remain protected. The vulnerability allows for both file inclusion and execution, meaning attackers can not only read arbitrary files but also potentially execute code on the server if the application is configured to process PHP files from user-supplied paths. This represents a critical security risk as it can lead to complete system compromise, data theft, and unauthorized access to sensitive information.
From an operational perspective, this vulnerability presents significant risk to organizations deploying PsNews 1.1 systems, particularly those with web-facing applications that process user input through the affected script. The impact extends beyond simple information disclosure to include potential remote code execution, which aligns with the MITRE ATT&CK framework's technique T1059.007 for Command and Scripting Interpreter, as attackers can execute arbitrary commands on the compromised system. The vulnerability's exploitation is straightforward and requires minimal technical expertise, making it attractive to both skilled attackers and automated exploitation tools. Organizations may face regulatory compliance issues if sensitive data is accessed through this vulnerability, particularly in environments subject to standards such as PCI DSS, HIPAA, or SOX requirements. The attack surface is particularly concerning for web applications that handle sensitive content or user data, as the vulnerability can be exploited through simple HTTP requests without requiring authentication or special privileges.
Mitigation strategies for CVE-2007-3772 should focus on immediate input validation and sanitization measures that prevent directory traversal sequences from being processed by the application. Organizations should implement proper parameter validation that filters out special characters including .., /, and \ from user input before it is used in file system operations. The recommended approach includes using a whitelist-based validation system that only accepts predetermined safe values for the newspath parameter, or implementing proper path normalization that resolves absolute paths and prevents traversal attempts. Additionally, the application should be configured to run with minimal privileges and access rights, limiting the damage that can occur even if exploitation succeeds. System administrators should also consider implementing web application firewalls that can detect and block malicious directory traversal patterns in HTTP requests. The most effective long-term solution involves upgrading to a patched version of PsNews 1.1 or migrating to a more modern content management system that properly implements input validation and follows secure coding practices. Security monitoring should include detection of unusual file access patterns and directory traversal attempts in web server logs, as this vulnerability can be used as an initial access vector for more sophisticated attacks within compromised environments.