CVE-2009-2333 in CMS Chainuk
Summary
by MITRE
Multiple directory traversal vulnerabilities in CMS Chainuk 1.2 and earlier allow remote attackers to include and execute arbitrary local files via a .. (dot dot) in (1) the menu parameter to admin/admin_menu.php, and the id parameter to (2) index.php and (3) admin/admin_edit.php; and (4) delete arbitrary local files via a .. (dot dot) in the id parameter to admin/admin_delete.php. NOTE: vector 2 can be leveraged for static code injection by sending a crafted menu parameter to admin/admin_menu.php, and then sending an id=../menu.csv request to index.php.
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Analysis
by VulDB Data Team • 03/13/2025
The vulnerability described in CVE-2009-2333 represents a critical directory traversal flaw affecting CMS Chainuk version 1.2 and earlier systems. This vulnerability stems from inadequate input validation mechanisms within the application's file handling processes, allowing malicious actors to manipulate file paths through specially crafted parameters. The flaw manifests across multiple entry points within the administrative interface, specifically targeting parameters that control menu navigation and file operations. The core issue lies in the application's failure to properly sanitize user-supplied input before using it in file system operations, creating opportunities for attackers to access arbitrary files on the server.
The technical exploitation of this vulnerability occurs through manipulation of dot-dot-slash sequences in HTTP parameters, a well-documented attack pattern that enables attackers to traverse the file system hierarchy beyond intended boundaries. When the menu parameter in admin/admin_menu.php receives input containing directory traversal sequences, it allows attackers to include and execute arbitrary local files. Similarly, the id parameters in index.php, admin/admin_edit.php, and admin/admin_delete.php provide additional attack vectors where the same traversal techniques can be applied. The vulnerability's severity is amplified by the fact that the attack vectors can be chained together, with the initial exploitation in admin_menu.php enabling subsequent static code injection through crafted requests to index.php. This demonstrates how a single vulnerability can compound into more sophisticated attack capabilities, making it particularly dangerous for systems that rely on this content management platform.
The operational impact of CVE-2009-2333 extends beyond simple unauthorized file access, as it provides attackers with the capability to execute arbitrary code on the target system. This level of access enables full system compromise, data exfiltration, and potential lateral movement within network environments. The vulnerability's presence in administrative components means that successful exploitation could lead to complete control over the CMS functionality, potentially affecting thousands of users depending on the system's scope. The ability to delete arbitrary local files through the admin_delete.php endpoint further compounds the damage potential, allowing attackers to destroy critical system components or remove security controls. From an industry standards perspective, this vulnerability aligns with CWE-22 (Improper Limitation of a Pathname to a Restricted Directory) and represents a classic example of how insufficient input validation can lead to privilege escalation and arbitrary code execution, commonly categorized under ATT&CK technique T1059.007 (Command and Scripting Interpreter: PowerShell) when attackers leverage these vulnerabilities to execute malicious payloads.
The remediation strategy for this vulnerability requires immediate implementation of proper input validation and sanitization mechanisms throughout the application's codebase. All user-supplied parameters that influence file system operations must undergo rigorous validation to prevent directory traversal sequences from being processed. The solution involves implementing strict path validation that ensures all file access operations occur within predetermined, secure directories, effectively preventing path traversal attacks. Additionally, the application should employ proper access controls and privilege separation to minimize the impact of any potential exploitation attempts. System administrators should also consider implementing web application firewalls and intrusion detection systems to monitor for suspicious parameter patterns that may indicate exploitation attempts. The vulnerability's age and the availability of patches for CMS Chainuk systems underscore the importance of maintaining up-to-date security controls and conducting regular vulnerability assessments to identify and remediate similar issues across all deployed applications. Organizations should also implement comprehensive logging and monitoring of file system operations to detect anomalous access patterns that may indicate exploitation of similar vulnerabilities.