CVE-2008-0742 in PowerNews
Summary
by MITRE
Multiple directory traversal vulnerabilities in PowerScripts PowerNews 2.5.6 allow remote attackers to read and include arbitrary files via a .. (dot dot) in the (1) subpage parameter in (a) categories.inc.php, (b) news.inc.php, (c) other.inc.php, (d) permissions.inc.php, (e) templates.inc.php, and (f) users.inc.php in pnadmin/; and (2) the page parameter to (g) pnadmin/index.php. NOTE: vector 2 is only exploitable by administrators.
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Analysis
by VulDB Data Team • 10/17/2024
The CVE-2008-0742 vulnerability represents a critical directory traversal flaw affecting PowerScripts PowerNews 2.5.6 content management system. This vulnerability stems from inadequate input validation in multiple administrative include files, creating a pathway for remote attackers to access arbitrary files on the server. The flaw manifests through the manipulation of dot-dot-slash sequences in specific parameters, allowing unauthorized file access and potential code execution. The vulnerability affects six distinct include files within the pnadmin directory structure, including categories.inc.php, news.inc.php, and other administrative components. Additionally, a separate vector targets the page parameter in the pnadmin/index.php file, though this variant requires administrative privileges for exploitation. This directory traversal vulnerability directly maps to CWE-22, which categorizes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The attack surface extends across multiple administrative functions, making the impact significantly broader than typical single-file vulnerabilities.
The technical exploitation of this vulnerability occurs through the manipulation of HTTP request parameters that control which files are included or processed by the web application. When attackers submit requests containing .. sequences in the subpage parameter, the application fails to properly sanitize these inputs, allowing the traversal mechanism to navigate beyond the intended directory boundaries. The affected files operate under the assumption that user-provided input is safe, failing to implement proper input validation or path sanitization measures. The vulnerability is particularly concerning because it affects core administrative include files that handle various aspects of the content management system's functionality, from user permissions to template management. Attackers can leverage this flaw to read sensitive configuration files, database credentials, or even system files that should remain inaccessible to unauthorized users. The inclusion of administrative files in the attack scope means that successful exploitation could lead to complete system compromise.
The operational impact of CVE-2008-0742 extends beyond simple information disclosure, potentially enabling attackers to achieve full system compromise and persistent access. Remote attackers can utilize this vulnerability to read arbitrary files, which may contain database connection strings, encryption keys, or other sensitive information that could be leveraged for further attacks. The ability to include arbitrary files also opens the door to code injection attacks, where attackers might upload malicious files and have them executed by the vulnerable application. The fact that the vulnerability affects multiple administrative files creates a comprehensive attack vector that could allow an attacker to gain deep insights into the system's architecture and configuration. Organizations running PowerScripts PowerNews 2.5.6 are particularly vulnerable as this flaw enables unauthorized access to critical system components without requiring authentication for the primary attack vectors. The potential for privilege escalation exists when combined with other vulnerabilities, as attackers could exploit this weakness to gain administrative access to the entire content management system.
Mitigation strategies for CVE-2008-0742 should focus on immediate input validation and access control measures. Organizations must implement proper parameter validation that rejects or sanitizes input containing directory traversal sequences, particularly when these parameters control file inclusion operations. The recommended approach includes implementing a whitelist validation mechanism that only accepts known good values for file inclusion parameters, rather than relying on blacklisting potentially dangerous characters. Organizations should also enforce strict access controls and authentication mechanisms, particularly for administrative endpoints, as the secondary attack vector requires administrative privileges. System administrators should immediately update to the latest version of PowerScripts PowerNews or apply vendor-provided patches to address this vulnerability. Network segmentation and monitoring should be implemented to detect suspicious file access patterns that may indicate exploitation attempts. The ATT&CK framework categorizes this vulnerability under T1059 for command and scripting interpreter and T1083 for file and directory discovery, highlighting the reconnaissance and access phases that attackers can leverage through this flaw. Additionally, implementing proper input sanitization practices and following secure coding guidelines can prevent similar vulnerabilities from manifesting in future applications, as this vulnerability directly relates to insecure coding practices that should be avoided in all web application development.