CVE-2008-4759 in BuzzyWall
Summary
by MITRE
Directory traversal vulnerability in download.php in BuzzyWall 1.3.1 allows remote attackers to read arbitrary local files via a .. (dot dot) in the id parameter.
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Analysis
by VulDB Data Team • 11/09/2024
The vulnerability identified as CVE-2008-4759 represents a critical directory traversal flaw within the BuzzyWall 1.3.1 web application, specifically affecting the download.php component. This weakness enables remote attackers to access arbitrary local files on the server by manipulating the id parameter through the use of directory traversal sequences such as .. characters. The vulnerability stems from insufficient input validation and sanitization mechanisms within the application's file handling routines, allowing malicious users to bypass normal access controls and retrieve sensitive data from the underlying file system.
This directory traversal vulnerability maps to 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 operates by exploiting the application's failure to properly validate user-supplied input before using it in file system operations. When the id parameter contains directory traversal sequences, the application processes these inputs without adequate sanitization, resulting in the resolution of file paths that extend beyond the intended directory boundaries. This creates a significant security risk where attackers can potentially access configuration files, source code, database files, and other sensitive system resources that should remain protected from unauthorized access.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with the capability to access critical system components that could lead to further compromise. An attacker could potentially retrieve administrative configuration files, database credentials, or application source code that might reveal additional vulnerabilities or provide insights into the system architecture. The remote nature of this attack means that no local system access is required, making it particularly dangerous as it can be exploited from anywhere on the internet. This vulnerability essentially undermines the fundamental security principle of least privilege, allowing unauthorized access to files that should only be accessible to authorized personnel or system processes.
Mitigation strategies for CVE-2008-4759 should focus on implementing proper input validation and sanitization mechanisms within the application's file handling code. The most effective approach involves implementing strict parameter validation that rejects any input containing directory traversal sequences such as .. or %2e%2e. Additionally, the application should employ absolute path resolution techniques that ensure all file operations occur within predefined safe directories. Implementing proper access controls and privilege separation can further reduce the impact of such vulnerabilities. Organizations should also consider implementing web application firewalls that can detect and block suspicious traversal attempts, while regular security assessments and code reviews should be conducted to identify similar vulnerabilities in other components. The remediation process should include thorough testing of all file access functions to ensure that input validation is robust and that the application behaves correctly under various attack scenarios. This vulnerability serves as a reminder of the importance of following secure coding practices and adhering to the principle of input sanitization as outlined in various security frameworks including the OWASP Top Ten and NIST cybersecurity guidelines.