CVE-2008-4781 in MyKtools
Summary
by MITRE
Directory traversal vulnerability in update.php in MyKtools 2.4 allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the langage parameter.
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Analysis
by VulDB Data Team • 11/09/2024
The vulnerability identified as CVE-2008-4781 represents a critical directory traversal flaw within the MyKtools 2.4 web application framework, specifically affecting the update.php script. This vulnerability stems from inadequate input validation mechanisms that fail to properly sanitize user-supplied parameters before processing them within the application's file inclusion logic. The flaw manifests when the langage parameter receives input containing .. (dot dot) sequences that manipulate the file path resolution mechanism, allowing attackers to traverse the directory structure beyond intended boundaries. The vulnerability is classified under CWE-22 as "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')" which directly impacts the application's ability to maintain proper file access controls and isolation.
The technical exploitation of this vulnerability occurs when remote attackers submit malicious input containing directory traversal sequences through the langage parameter of the update.php endpoint. When the application processes this parameter without proper sanitization, it constructs file paths that resolve to arbitrary local files on the server filesystem. This enables attackers to include and execute local files that should normally remain inaccessible to remote users, potentially leading to unauthorized code execution, data exposure, or complete system compromise. The vulnerability's impact is amplified by the fact that it operates at the file system level, bypassing traditional web application security controls and potentially allowing access to sensitive configuration files, database credentials, or system binaries that reside within the application's directory structure.
The operational impact of this directory traversal vulnerability extends beyond simple code execution to encompass comprehensive system compromise and data breach scenarios. Attackers can leverage this vulnerability to access sensitive files such as database configuration files, application credentials, or system user files that contain authentication tokens and other confidential information. The vulnerability also enables attackers to upload and execute malicious code by traversing to writable directories, potentially establishing persistent backdoors or command and control channels. From an attacker's perspective, this vulnerability represents a critical entry point that can be exploited without requiring prior authentication or elevated privileges, making it particularly dangerous in environments where the application serves as a gateway to internal systems. The attack surface is further expanded by the fact that this vulnerability can be chained with other exploits to escalate privileges or move laterally within the network infrastructure.
Mitigation strategies for CVE-2008-4781 must address both immediate remediation and long-term architectural improvements to prevent similar vulnerabilities from emerging in future development cycles. The primary immediate fix involves implementing proper input validation and sanitization mechanisms that reject or filter out directory traversal sequences from all user-supplied parameters before they are processed by the application. This includes implementing strict parameter validation that ensures all input values conform to expected formats and ranges, particularly for file path parameters. Organizations should also implement proper access controls and privilege separation to limit the application's ability to access sensitive system files even if traversal attacks are partially successful. The implementation of a secure coding framework that enforces proper file access controls and input validation should be mandatory for all development teams. Additionally, regular security assessments and code reviews should be conducted to identify and remediate similar vulnerabilities across the entire application portfolio, following the principles outlined in the software security development lifecycle. The vulnerability also highlights the importance of implementing web application firewalls and intrusion detection systems that can identify and block suspicious directory traversal patterns in network traffic.