CVE-2009-4723 in Netpet
Summary
by MITRE
Directory traversal vulnerability in confirm.php in Netpet CMS 1.9 allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the language parameter.
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Analysis
by VulDB Data Team • 05/02/2026
The vulnerability identified as CVE-2009-4723 represents a critical directory traversal flaw within the Netpet CMS 1.9 content management system. This weakness exists in the confirm.php script where the application fails to properly validate user input passed through the language parameter. The vulnerability stems from the application's insufficient sanitization of input data, allowing malicious actors to manipulate file paths and access unauthorized system resources. The issue manifests when an attacker crafts a request containing .. (dot dot) sequences in the language parameter, which enables them to traverse the directory structure and potentially access sensitive files or execute arbitrary code on the target system.
This directory traversal vulnerability maps directly to CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The flaw operates by exploiting the lack of proper input validation and sanitization mechanisms within the application's file inclusion process. When the confirm.php script processes the language parameter without adequate security controls, it becomes susceptible to manipulation that allows attackers to bypass normal file access restrictions and gain unauthorized access to the file system. The vulnerability creates a pathway for attackers to include and execute local files that should normally be protected from external access.
The operational impact of this vulnerability is severe and multifaceted, potentially allowing remote attackers to execute arbitrary code on the affected system. An attacker could leverage this flaw to access sensitive configuration files, database credentials, user information, or system files that contain critical data. The remote execution capability means that attackers do not require physical access to the system and can exploit the vulnerability from anywhere on the network. This vulnerability also aligns with ATT&CK technique T1059, which describes the use of command and scripting interpreter for code execution, as attackers could potentially execute malicious code through the file inclusion mechanism. The vulnerability could also support further attack vectors such as privilege escalation or lateral movement within the network infrastructure.
Mitigation strategies for CVE-2009-4723 should focus on implementing proper input validation and sanitization mechanisms within the application. The most effective approach involves implementing strict parameter validation that rejects any input containing directory traversal sequences such as .. or %2e%2e. Organizations should implement a whitelist approach for language parameters, allowing only predefined, legitimate values rather than accepting arbitrary input. Additionally, the application should employ proper file access controls and ensure that all file inclusion operations occur within restricted directories. The implementation of input validation at multiple layers, including application-level filters and web application firewalls, provides defense-in-depth protection. System administrators should also consider implementing the principle of least privilege, ensuring that web applications run with minimal required permissions and that sensitive files are properly protected from unauthorized access. Regular security assessments and code reviews should be conducted to identify and remediate similar vulnerabilities in other applications and components within the system infrastructure.