CVE-2005-1971 in FusionBB
Summary
by MITRE
Directory traversal vulnerability in InteractivePHP FusionBB .11 Beta and earlier allows remote attackers to include arbitrary local files via ".." sequences in the language parameter.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 07/09/2018
The vulnerability identified as CVE-2005-1971 represents a critical directory traversal flaw affecting InteractivePHP FusionBB versions 1.1 Beta and earlier. This security weakness resides in the application's handling of the language parameter, which fails to properly validate user input before processing file inclusion operations. The flaw enables malicious actors to manipulate the language parameter by injecting ".." sequences that traverse the directory structure and gain access to arbitrary local files on the server. This type of 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 vulnerability operates by exploiting the lack of proper input sanitization and validation mechanisms that should prevent unauthorized access to the file system.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious request containing directory traversal sequences within the language parameter. When the vulnerable application processes this parameter without adequate validation, it allows the attacker to navigate beyond the intended directory boundaries and access sensitive files such as configuration files, database credentials, or system files. The attack vector specifically targets the application's file inclusion mechanism, which typically uses user-supplied parameters to determine which language files to load. This creates an opportunity for attackers to include files from unexpected locations on the server, potentially leading to complete system compromise. The vulnerability is classified as a remote attack vector since it can be exploited without requiring local access to the target system, making it particularly dangerous in web-based environments.
The operational impact of CVE-2005-1971 extends beyond simple unauthorized file access, potentially enabling attackers to execute arbitrary code on the affected system. Successful exploitation could lead to complete system compromise, data theft, or service disruption. Attackers might leverage this vulnerability to access sensitive configuration files that contain database passwords, application keys, or other critical system information. The vulnerability also poses risks to data integrity and confidentiality, as it allows unauthorized access to potentially sensitive files that could contain personal information, business data, or proprietary code. Organizations running vulnerable versions of InteractivePHP FusionBB face significant exposure to these threats, particularly in environments where the application handles sensitive user data or serves as a critical component of business operations. This vulnerability directly aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter, as exploitation often involves executing commands through manipulated file inclusion mechanisms.
Mitigation strategies for this vulnerability require immediate action to address the underlying directory traversal flaw. The most effective approach involves implementing proper input validation and sanitization for all user-supplied parameters, particularly those used in file inclusion operations. Organizations should ensure that the application filters out directory traversal sequences and validates all input against a whitelist of acceptable values. The recommended solution includes implementing proper parameter validation that restricts file inclusion to predefined, safe directories and prevents access to parent directories using ".." sequences. Additionally, the application should employ secure coding practices that enforce proper file path handling and avoid direct user input in file operations. System administrators should also consider implementing web application firewalls and intrusion detection systems to monitor for suspicious activity patterns associated with directory traversal attacks. The vulnerability highlights the importance of following secure coding guidelines and conducting regular security assessments to identify and remediate similar weaknesses in web applications. Updates and patches should be applied immediately to all affected systems, as the vulnerability represents a critical security risk that can be exploited remotely without authentication.