CVE-2007-0620 in FD Script
Summary
by MITRE
download.php in FD Script 1.3.2 and earlier allows remote attackers to read source of files under the web document root with certain extensions, including .php, via a relative pathname in the fname parameter, as demonstrated by downloading config.php.
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Analysis
by VulDB Data Team • 08/25/2025
The vulnerability identified as CVE-2007-0620 affects FD Script version 1.3.2 and earlier, specifically targeting the download.php script within the application's file handling mechanism. This security flaw represents a classic path traversal vulnerability that enables unauthorized access to sensitive files within the web server's document root directory. The vulnerability stems from inadequate input validation and sanitization of user-supplied parameters, particularly the fname parameter that controls file downloads. Attackers can exploit this weakness by manipulating the fname parameter with relative path references to access files that should remain protected, including configuration files and source code that contain sensitive information.
The technical implementation of this vulnerability involves the application's failure to properly validate and sanitize the fname parameter before processing file requests. When a user submits a request through the download.php script, the application directly incorporates the provided filename parameter into its file access operations without sufficient validation. This allows attackers to construct malicious path references that traverse the directory structure to access files outside of intended download boundaries. The vulnerability specifically affects files with extensions such as .php, which are commonly used for configuration files, database connection details, and other sensitive application components. The attack demonstrates how a simple parameter manipulation can lead to complete disclosure of source code and configuration data.
The operational impact of this vulnerability extends beyond mere information disclosure, creating significant security risks for systems running affected versions of FD Script. Remote attackers can obtain sensitive configuration files that often contain database credentials, API keys, application settings, and other critical information that could be exploited for further attacks. The exposure of PHP source code provides attackers with detailed knowledge of the application's internal logic, potentially revealing additional vulnerabilities or attack vectors. This type of vulnerability aligns with CWE-22 Path Traversal and CWE-312 Cleartext Storage of Sensitive Information, representing a fundamental flaw in input validation and access control mechanisms. The attack pattern follows typical techniques described in the MITRE ATT&CK framework under T1083 File and Directory Discovery and T1566 Phishing, as it enables reconnaissance activities that support more sophisticated attacks.
Organizations using affected versions of FD Script should immediately implement multiple layers of mitigation to address this vulnerability. The primary fix involves implementing strict input validation and sanitization for the fname parameter, ensuring that all user-supplied paths are properly validated against a whitelist of allowed files or directories. Additionally, the application should enforce proper access controls that prevent traversal outside of designated download directories through the use of absolute paths and directory restrictions. System administrators should also consider implementing web application firewalls that can detect and block suspicious path traversal attempts. Regular security audits and code reviews should be conducted to identify similar vulnerabilities in other components of the application. The remediation process should include updating to the latest version of FD Script where this vulnerability has been patched, as well as implementing proper file access controls and monitoring mechanisms to detect potential exploitation attempts.