CVE-2009-1624 in Dew-NewPHPLinks
Summary
by MITRE
Directory traversal vulnerability in index.php in Dew-NewPHPLinks 2.0 allows remote attackers to read arbitrary files via a .. (dot dot) in the show parameter.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 11/27/2024
The vulnerability identified as CVE-2009-1624 represents a critical directory traversal flaw within the Dew-NewPHPLinks 2.0 web application. This security weakness resides in the index.php script where the application fails to properly validate user input submitted through the show parameter. The vulnerability enables malicious actors to exploit the application's file handling mechanism by injecting directory traversal sequences using the .. (dot dot) notation. When the application processes these crafted inputs without adequate sanitization, it allows unauthorized access to files outside the intended directory structure, potentially exposing sensitive system information.
This directory traversal vulnerability maps directly to CWE-22, which defines improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The flaw operates by manipulating the file inclusion logic within the web application, where user-supplied parameters are directly incorporated into file system operations without proper input validation or sanitization. The attack vector specifically targets the show parameter in index.php, which likely serves as a mechanism for displaying different content sections or files based on user requests. When attackers submit malicious inputs containing .. sequences, the application interprets these as requests to navigate up directory levels, bypassing normal access controls and potentially accessing system files, configuration data, or other sensitive resources that should remain protected from external access.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with the capability to access arbitrary files on the web server filesystem. This could include database configuration files containing database credentials, application source code revealing implementation details, log files with sensitive operational data, or even system configuration files that might contain additional attack vectors. The vulnerability affects the confidentiality and integrity of the web application and underlying system, potentially enabling further exploitation such as privilege escalation, remote code execution, or complete system compromise. Organizations running Dew-NewPHPLinks 2.0 are at risk of unauthorized data access and potential breach of sensitive information stored within the application environment.
Mitigation strategies for CVE-2009-1624 should focus on implementing robust input validation and sanitization mechanisms within the web application. The primary defense involves ensuring that all user-supplied parameters, particularly those used in file operations, are properly validated against a whitelist of acceptable values. This approach aligns with the principle of least privilege and input validation best practices recommended by security frameworks such as the OWASP Top Ten. Organizations should implement proper parameter sanitization by filtering out or escaping special characters like .., /, and \ that could be used in directory traversal attacks. Additionally, the application should employ secure file handling practices by restricting file access to predefined directories and implementing proper access controls. The remediation process should include updating to the latest version of Dew-NewPHPLinks 2.0 where this vulnerability has been addressed, or implementing proper input validation and output encoding mechanisms that prevent malicious input from being processed by the application's file handling routines. Security monitoring should also be enhanced to detect suspicious file access patterns that may indicate attempted exploitation of this vulnerability.