CVE-2008-6490 in FLABER
Summary
by MITRE
function/update_xml.php in FLABER 1.1 and earlier allows remote attackers to overwrite arbitrary files by specifying the target filename in the target_file parameter. NOTE: this can be leveraged for code execution by overwriting a PHP file, as demonstrated using function/upload_file.php.
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Analysis
by VulDB Data Team • 10/20/2024
The vulnerability identified as CVE-2008-6490 affects FLABER version 1.1 and earlier, presenting a critical file overwrite flaw in the function/update_xml.php component. This vulnerability stems from inadequate input validation and sanitization mechanisms within the application's file handling processes. The flaw specifically resides in how the application processes the target_file parameter, which allows remote attackers to specify arbitrary filenames for overwriting operations without proper authorization checks or path validation.
The technical implementation of this vulnerability enables attackers to manipulate the file system through a carefully crafted target_file parameter. When an attacker submits a malicious filename through this parameter, the application blindly processes the request without verifying whether the target location is within acceptable boundaries or if the operation would result in overwriting critical system files. This lack of proper input validation creates a path traversal and arbitrary file overwrite condition that can be exploited across network boundaries. The vulnerability is particularly dangerous because it can be leveraged for code execution by overwriting PHP files, as demonstrated through the exploitation path using function/upload_file.php.
The operational impact of this vulnerability extends beyond simple file overwrite capabilities to encompass complete system compromise potential. Attackers can leverage this flaw to upload malicious PHP code, modify existing application files, or replace critical system components with malicious equivalents. The vulnerability creates a persistent backdoor opportunity where attackers can maintain access to the compromised system over extended periods. From a cybersecurity perspective, this vulnerability represents a severe privilege escalation vector that can be exploited without authentication, potentially allowing attackers to gain full administrative control over the affected web application and underlying server infrastructure.
Mitigation strategies for CVE-2008-6490 should prioritize immediate patching of the affected FLABER versions to address the core input validation flaw. Organizations must implement comprehensive input sanitization measures that validate all user-supplied data against strict whitelists and sanitize file paths to prevent directory traversal attacks. The implementation of proper access controls and file permission management should be enforced to restrict file system operations to authorized users only. Additionally, network segmentation and intrusion detection systems should be deployed to monitor for suspicious file operations and unauthorized access attempts. This vulnerability aligns with CWE-22 Path Traversal and CWE-73 Improper Neutralization of Special Elements in Output Used by a Downstream Component, and maps to ATT&CK techniques including T1059 Command and Scripting Interpreter and T1566 Phishing with Malicious Attachments, emphasizing the need for layered security controls to prevent exploitation.