CVE-2005-4319 in Limbo
Summary
by MITRE
Directory traversal vulnerability in index2.php in Limbo CMS 1.0.4.2 and earlier allows remote attackers to include arbitrary PHP files via ".." sequences in the option parameter.
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Analysis
by VulDB Data Team • 08/11/2025
The vulnerability identified as CVE-2005-4319 represents a critical directory traversal flaw within Limbo CMS version 1.0.4.2 and earlier installations. This security weakness resides in the index2.php script which fails to properly validate user input parameters, specifically the option parameter that controls file inclusion operations. The flaw enables malicious actors to exploit the application's file handling mechanisms by manipulating directory navigation sequences using double dots ".." which are commonly used to traverse up directory levels in file systems. This vulnerability directly maps to CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks.
The technical implementation of this vulnerability allows remote attackers to manipulate the option parameter in such a way that the application's file inclusion mechanism processes arbitrary file paths. When the application receives a request containing ".." sequences within the option parameter, it fails to sanitize or validate these inputs before passing them to file inclusion functions. This creates an opportunity for attackers to access files outside the intended directory structure, potentially leading to unauthorized access to sensitive system files, configuration data, or even remote code execution depending on the server configuration and file permissions. The vulnerability operates at the application layer and can be exploited through web-based interfaces without requiring any special privileges or authentication.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with the capability to potentially escalate their privileges and gain deeper access to the affected system. Attackers can leverage this flaw to access database configuration files, user credentials, application source code, and other sensitive data that may be stored in adjacent directories. In environments where the web application has elevated privileges or access to sensitive system resources, this vulnerability could lead to complete system compromise. The attack vector is particularly dangerous because it requires no prior authentication and can be executed through standard web browser interactions, making it highly exploitable in automated attack scenarios. This weakness aligns with ATT&CK technique T1083, which covers directory and file permissions enumeration, and T1566, which covers credential access through various means including file system access.
Mitigation strategies for this vulnerability should focus on immediate input validation and sanitization measures. System administrators should implement proper parameter validation that rejects or filters out directory traversal sequences such as ".." and "/" characters from user input before processing. The recommended approach includes implementing a whitelist-based validation system that only accepts predefined, safe parameter values for the option parameter. Additionally, the application should be upgraded to a patched version of Limbo CMS that properly implements input sanitization and file inclusion controls. Server-level restrictions should also be implemented to limit the web application's access to only necessary directories and files. Organizations should also consider implementing web application firewalls that can detect and block suspicious parameter patterns associated with directory traversal attacks. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other applications and ensure that proper security controls are in place to prevent unauthorized file access. The vulnerability underscores the critical importance of input validation and proper access controls in web applications, particularly those handling user-supplied data for file operations.