CVE-2009-0886 in OneOrZero Helpdesk
Summary
by MITRE
Directory traversal vulnerability in login.php in OneOrZero Helpdesk 1.6.5.7 and earlier allows remote attackers to read arbitrary files via a .. (dot dot) in the default_language parameter.
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Analysis
by VulDB Data Team • 11/24/2024
The vulnerability identified as CVE-2009-0886 represents a classic directory traversal flaw within the OneOrZero Helpdesk application version 1.6.5.7 and earlier. This security weakness resides in the login.php script where user input containing directory traversal sequences is not properly sanitized or validated before being processed. The specific parameter affected is default_language which accepts user-supplied values without adequate input filtering mechanisms.
This directory traversal vulnerability falls under the Common Weakness Enumeration category CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The flaw enables remote attackers to manipulate file access by injecting sequences such as .. into the default_language parameter, allowing them to navigate outside the intended directory structure and access arbitrary files on the server filesystem. The vulnerability is particularly concerning as it operates without requiring authentication, making it accessible to any remote attacker who can interact with the web application.
The operational impact of this vulnerability extends beyond simple file disclosure, as it can potentially expose sensitive system information including configuration files, database credentials, application source code, and other confidential data stored on the server. Attackers could leverage this weakness to gain unauthorized access to critical system resources, potentially leading to complete system compromise. The vulnerability affects the authentication mechanism of the helpdesk system, undermining the security posture of organizations relying on this software for customer support management. According to the MITRE ATT&CK framework, this vulnerability maps to T1083 (File and Directory Discovery) and T1566 (Phishing), as it enables attackers to discover and potentially exfiltrate sensitive files through the compromised authentication endpoint.
Mitigation strategies for this vulnerability require immediate implementation of input validation and sanitization measures within the application code. The most effective approach involves implementing strict parameter validation that filters out or rejects directory traversal sequences such as .., %2e%2e, or other similar encoding variants. Organizations should also implement proper access controls and privilege separation to limit the impact of potential file access. The recommended solution includes implementing a whitelist approach for language parameters, where only explicitly allowed values are accepted, and employing proper input sanitization techniques that remove or encode potentially dangerous characters. Additionally, regular security audits and code reviews should be conducted to identify similar vulnerabilities in other parts of the application. System administrators should also consider implementing web application firewalls and intrusion detection systems that can detect and block suspicious directory traversal attempts. The vulnerability demonstrates the critical importance of input validation in web applications and highlights the need for robust security practices in software development lifecycle processes to prevent such flaws from being introduced in the first place.