CVE-2008-2887 in FubarForum
Summary
by MITRE
Directory traversal vulnerability in index.php in chaozz@work FubarForum 1.5 allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the page parameter.
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Analysis
by VulDB Data Team • 10/29/2024
The vulnerability described in CVE-2008-2887 represents a classic directory traversal flaw that exists within the chaozz@work FubarForum 1.5 web application. This issue manifests in the index.php script where the application fails to properly validate or sanitize user input submitted through the page parameter. The vulnerability stems from the application's insecure handling of file inclusion mechanisms, allowing malicious actors to manipulate the page parameter to navigate through the file system hierarchy using the .. (dot dot) sequence. This type of vulnerability falls under the category of CWE-22 - Improper Limitation of a Pathname to a Restricted Directory, which is a fundamental weakness in input validation that enables attackers to access files outside the intended directory structure.
The technical exploitation of this vulnerability occurs when an attacker submits a crafted request containing directory traversal sequences in the page parameter of the index.php script. When the application processes this input without proper validation, it attempts to include and execute local files from locations outside the intended web root directory. This can potentially allow an attacker to access sensitive system files, configuration files, or even execute arbitrary code on the server if the application is running with sufficient privileges. The vulnerability is particularly dangerous because it can be leveraged to bypass authentication mechanisms, access database configuration files containing credentials, or retrieve source code that may reveal additional vulnerabilities within the application.
The operational impact of this vulnerability extends beyond simple information disclosure to encompass potential complete system compromise. Attackers can exploit this weakness to gain unauthorized access to the underlying operating system, potentially leading to privilege escalation or lateral movement within the network. According to ATT&CK framework, this vulnerability maps to T1059 - Command and Scripting Interpreter and T1083 - File and Directory Discovery, as attackers can use the traversal capability to explore the file system and execute commands. The vulnerability affects any system running chaozz@work FubarForum 1.5 where the application does not properly validate user input before processing file inclusion requests, making it a significant concern for web applications that rely on dynamic file inclusion based on user-supplied parameters.
Mitigation strategies for this vulnerability require immediate implementation of proper input validation and sanitization measures. The application should implement strict parameter validation that rejects any input containing directory traversal sequences or other malicious patterns. Security best practices dictate that all user-supplied input should be treated as untrusted and validated against a whitelist of acceptable values. Additionally, the application should employ proper file inclusion mechanisms that do not rely on user input to determine file paths, instead using predefined constants or configuration files to control file access. Organizations should also implement proper access controls and privilege separation to minimize the potential impact if such vulnerabilities are exploited. Regular security audits and code reviews should be conducted to identify similar patterns that may exist in other parts of the application or related systems, as directory traversal vulnerabilities often indicate broader input validation weaknesses that require comprehensive remediation approaches.