CVE-2008-2876 in mUnky
Summary
by MITRE
Directory traversal vulnerability in index.php in mUnky 0.0.1 allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the zone parameter.
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Analysis
by VulDB Data Team • 10/30/2024
The vulnerability identified as CVE-2008-2876 represents a critical directory traversal flaw within the mUnky content management system version 0.0.1. This security weakness resides in the index.php script where user input is improperly validated and processed, specifically within the zone parameter handling mechanism. The vulnerability stems from inadequate input sanitization that fails to properly filter or escape special characters, particularly the double dot sequence that signifies parent directory access in Unix-like file systems. Attackers can exploit this flaw by crafting malicious requests that include directory traversal sequences, enabling them to navigate beyond the intended directory structure and access arbitrary local files on the server.
The technical exploitation of this vulnerability follows a well-established pattern that aligns with CWE-22 - Improper Limitation of a Pathname to a Restricted Directory. When the zone parameter contains sequences such as ../ or ..\, the application fails to properly validate these inputs against a whitelist of allowed values or to sanitize them through proper path normalization techniques. This allows attackers to manipulate the file inclusion mechanism and potentially execute arbitrary code or gain unauthorized access to sensitive system files, configuration data, or other resources that should remain protected. The vulnerability operates at the application layer and can be exploited remotely without requiring authentication, making it particularly dangerous in publicly accessible web environments.
The operational impact of this directory traversal vulnerability extends beyond simple information disclosure to encompass potential full system compromise. An attacker who successfully exploits this vulnerability can access critical system files including database configuration files, application source code, server configuration files, and potentially user data. This exposure can lead to privilege escalation, data theft, system takeover, or the deployment of additional malicious payloads. The vulnerability affects the integrity and confidentiality of the affected system, potentially enabling attackers to establish persistent access or launch further attacks against the internal network. According to ATT&CK framework, this vulnerability maps to T1059 - Command and Scripting Interpreter and T1566 - Phishing, as it provides a foundation for executing malicious commands and gaining initial access to systems.
Mitigation strategies for CVE-2008-2876 should prioritize immediate patching of the mUnky application to the latest available version that addresses this directory traversal vulnerability. Organizations should implement proper input validation and sanitization techniques, including the use of allowlists for parameter values and proper path normalization before processing user input. The principle of least privilege should be enforced by running the web application with minimal required permissions and restricting file system access to only necessary directories. Additionally, implementing web application firewalls and intrusion detection systems can help detect and block malicious traversal attempts. Regular security audits and code reviews should be conducted to identify similar vulnerabilities in other applications, while input validation should be strengthened through the use of established security libraries and frameworks that properly handle file path operations and prevent directory traversal attacks.