CVE-2008-7090 in Pligg
Summary
by MITRE
Multiple directory traversal vulnerabilities in Pligg 9.9 and earlier allow remote attackers to (1) determine the existence of arbitrary files via a .. (dot dot) in the $tb_url variable in trackback.php, or (2) include arbitrary files via a .. (dot dot) in the template parameter to settemplate.php.
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Analysis
by VulDB Data Team • 11/02/2024
The vulnerability identified as CVE-2008-7090 represents a critical directory traversal flaw affecting Pligg versions 9.9 and earlier, demonstrating a fundamental weakness in input validation and file handling mechanisms. This vulnerability exists within the content management system's trackback.php and settemplate.php scripts, where improper sanitization of user-supplied input creates opportunities for attackers to manipulate file paths and access unauthorized system resources. The flaw specifically exploits the absence of proper validation for the tb_url variable in trackback.php and the template parameter in settemplate.php, allowing malicious actors to craft requests containing directory traversal sequences.
The technical exploitation of this vulnerability occurs through the manipulation of dot-dot-slash sequences in HTTP request parameters, enabling attackers to navigate beyond the intended directory boundaries. In the trackback.php script, the $tb_url variable receives user input without adequate sanitization, allowing attackers to probe the filesystem for the existence of arbitrary files through directory traversal attacks. Similarly, the settemplate.php script accepts a template parameter that can be manipulated to include arbitrary files from the system, potentially leading to remote code execution or information disclosure. These vulnerabilities fall under the CWE-22 category, specifically addressing improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks.
The operational impact of this vulnerability extends beyond simple information disclosure to potentially enable full system compromise. Attackers can leverage the directory traversal capabilities to access sensitive system files, configuration data, and potentially execute malicious code if the application has write permissions to critical directories. The ability to include arbitrary files through the template parameter creates a pathway for remote code execution, especially if the application allows user-uploaded templates or if the system configuration permits such operations. This vulnerability directly relates to ATT&CK technique T1059.007 for command and script injection, as the inclusion of arbitrary files can lead to code execution in the application context. The attack surface is particularly concerning for web applications that process user input in file operations, as it demonstrates how insufficient input validation can result in complete system compromise.
Mitigation strategies for CVE-2008-7090 require immediate implementation of proper input validation and sanitization measures across all user-supplied parameters. The primary defense involves implementing strict parameter validation that rejects or removes directory traversal sequences from all input fields before processing. Organizations should deploy web application firewalls that can detect and block suspicious directory traversal patterns in HTTP requests, particularly those containing double dots or backslashes. Additionally, the application should be configured with the principle of least privilege, ensuring that web server processes have minimal file system access rights and cannot traverse beyond designated directories. Regular security audits and code reviews should focus on input validation mechanisms, particularly in file handling operations, to prevent similar vulnerabilities from emerging in future versions. System administrators should also implement proper access controls and monitoring to detect unauthorized file access attempts, as the vulnerability's exploitation can be detected through anomalous file system access patterns in web server logs.