CVE-2008-4499 in Php Web Explorer Lite
Summary
by MITRE
Multiple directory traversal vulnerabilities in PHP Web Explorer 0.99b and earlier allow remote attackers to include and execute arbitrary local files via a .. (dot dot) in the (1) refer parameter to main.php and the (2) file parameter to edit.php.
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Analysis
by VulDB Data Team • 09/09/2025
The vulnerability described in CVE-2008-4499 represents a critical directory traversal flaw affecting PHP Web Explorer version 0.99b and earlier. This vulnerability exists within the web application's file handling mechanisms and allows remote attackers to manipulate file paths through specifically crafted input parameters. The flaw manifests in two distinct attack vectors within the application's core functionality, making it particularly dangerous as it affects multiple entry points for exploitation.
The technical implementation of this vulnerability stems from inadequate input validation and sanitization within the PHP Web Explorer application. When attackers manipulate the refer parameter in main.php or the file parameter in edit.php with directory traversal sequences such as .. or dot dot notation, the application fails to properly validate or sanitize these inputs before processing them as file paths. This lack of proper input validation creates a path traversal condition where the application interprets attacker-controlled input as legitimate file references, potentially allowing access to arbitrary files on the server's filesystem.
The operational impact of this vulnerability extends beyond simple information disclosure to encompass full remote code execution capabilities. An attacker who successfully exploits this vulnerability can include and execute arbitrary local files on the target system, potentially leading to complete system compromise. This vulnerability aligns with CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The attack vector specifically targets the application's file inclusion mechanisms, making it a prime example of how insufficient input validation can lead to severe security consequences.
The exploitation of this vulnerability follows established patterns found in the ATT&CK framework under the technique of "Path Traversal" with specific implications for web application exploitation. Attackers can leverage this weakness to access sensitive configuration files, database credentials, or even system binaries that could be executed to gain unauthorized access to the underlying system. The vulnerability's presence in both main.php and edit.php demonstrates the widespread nature of the flaw within the application's architecture, indicating that the developers failed to implement consistent input validation across all file handling functions.
Mitigation strategies for this vulnerability require immediate implementation of proper input validation and sanitization mechanisms throughout the application. Organizations should implement strict parameter validation that rejects or encodes any input containing directory traversal sequences such as .. or %2e%2e. The application should enforce proper file access controls and implement a whitelist approach for file operations, ensuring that only explicitly allowed files can be accessed. Additionally, the system should employ proper path normalization techniques and avoid direct user input in file path construction. Security measures should also include regular security audits and code reviews to identify similar vulnerabilities in other parts of the application or related systems. This vulnerability serves as a critical reminder of the importance of input validation and proper access control mechanisms in web applications, particularly those handling file operations.