CVE-2009-4205 in Flashlight Free Edition
Summary
by MITRE
Directory traversal vulnerability in admin.php in Flashlight Free Edition allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the action parameter.
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Analysis
by VulDB Data Team • 11/30/2024
The vulnerability identified as CVE-2009-4205 represents a critical directory traversal flaw in the Flashlight Free Edition content management system. This weakness exists within the admin.php file where the application fails to properly validate user input passed through the action parameter. The vulnerability stems from insufficient input sanitization mechanisms that allow attackers to manipulate file paths using the .. (dot dot) sequence, enabling them to navigate directories outside the intended application scope. Such directory traversal vulnerabilities are classified under 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 demonstrates a fundamental failure in input validation and access control mechanisms that should prevent unauthorized file system access.
The technical exploitation of this vulnerability occurs when a remote attacker crafts a malicious request containing directory traversal sequences in the action parameter of the admin.php script. By appending .. sequences to the parameter value, an attacker can manipulate the file inclusion mechanism to access arbitrary local files on the server filesystem. This allows for the execution of arbitrary code or the retrieval of sensitive information such as configuration files, database credentials, or other confidential data stored on the server. The impact extends beyond simple file reading to potentially enable complete system compromise, as attackers can leverage this vulnerability to execute malicious code within the application context. The vulnerability operates at the application layer and can be classified under ATT&CK technique T1059.007 for command and script injection, specifically targeting the application's file inclusion functionality.
The operational consequences of this vulnerability are severe and multifaceted for affected organizations. System administrators and security teams face potential unauthorized access to critical system resources, including database configuration files that may contain database passwords and connection strings. Additionally, attackers can potentially read sensitive application files, user data, or system configuration files that could lead to further exploitation opportunities. The vulnerability affects the integrity and confidentiality of the affected system, potentially enabling attackers to escalate privileges or establish persistent access. Organizations running vulnerable versions of Flashlight Free Edition face significant risk of data breaches, system compromise, and potential regulatory violations depending on the nature of the data processed by the affected application. The vulnerability also impacts the availability of the service if attackers choose to exploit it for denial-of-service attacks or to deploy malicious payloads that consume system resources.
Mitigation strategies for CVE-2009-4205 should focus on immediate input validation and sanitization measures. Organizations must implement proper parameter validation that rejects or sanitizes directory traversal sequences before processing user input. The recommended approach involves implementing a whitelist-based validation mechanism that only accepts known good values for the action parameter, or employing proper input encoding and escaping techniques. Additionally, the application should be configured to run with minimal necessary privileges and implement proper access controls to limit the impact of any successful exploitation attempts. Security patches should be applied immediately to update to versions that address this vulnerability, as the original Flashlight Free Edition version containing this flaw should be considered deprecated. Network segmentation and intrusion detection systems should be configured to monitor for suspicious directory traversal patterns in application traffic. Organizations should also conduct comprehensive security assessments to identify other potential path traversal vulnerabilities within their application frameworks and implement proper security coding practices to prevent similar issues in future development cycles. The remediation process should include regular security audits and code reviews specifically focused on input validation and file handling mechanisms to ensure robust protection against similar attack vectors.