CVE-2008-4707 in BbZL.PhP
Summary
by MITRE
Directory traversal vulnerability in index.php in BbZL.PhP 0.92 allows remote attackers to access unauthorized directories via a .. (dot dot) in the lien_2 parameter.
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Analysis
by VulDB Data Team • 11/05/2024
The vulnerability identified as CVE-2008-4707 represents a classic directory traversal flaw within the BbZL.PhP 0.92 web application framework. This security weakness resides in the index.php file where user input is improperly validated and processed, creating an opportunity for malicious actors to access files and directories outside the intended web root. The vulnerability specifically manifests when the lien_2 parameter contains directory traversal sequences such as .. (dot dot) which allows attackers to navigate upward through the file system hierarchy. 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 has been consistently documented in security literature for decades.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious request containing the .. sequence within the lien_2 parameter, enabling them to traverse directories beyond the intended application boundaries. When the web application processes this input without proper sanitization or validation, it can lead to unauthorized file access, potentially exposing sensitive system files, configuration data, or other confidential information. The impact extends beyond simple file reading, as successful exploitation could allow attackers to execute arbitrary code, read database credentials, access administrative interfaces, or even gain full system control depending on the server configuration and file permissions. This vulnerability directly maps to ATT&CK technique T1083 - File and Directory Discovery, as it enables adversaries to enumerate and access restricted file system locations.
From an operational perspective, this vulnerability presents a significant risk to organizations deploying BbZL.PhP 0.92 applications, as it requires minimal effort for exploitation and can result in substantial data breaches or system compromise. The vulnerability is particularly dangerous because it operates at the application layer and can be exploited through standard web requests without requiring special tools or privileges. Security teams must consider the broader implications of such vulnerabilities within their attack surface, as directory traversal flaws often indicate poor input validation practices throughout the application codebase. The vulnerability also highlights the importance of implementing proper access controls and input sanitization mechanisms, which are fundamental requirements in security frameworks such as the OWASP Top Ten and NIST Cybersecurity Framework.
Effective mitigation strategies for CVE-2008-4707 involve implementing robust input validation and sanitization measures that prevent directory traversal sequences from being processed by the application. Developers should employ proper parameter validation techniques that reject or filter out special characters such as .. and / that could enable path traversal attacks. The implementation of a whitelist-based approach for file access operations, combined with proper file system permissions and the principle of least privilege, can significantly reduce the risk of exploitation. Additionally, organizations should ensure that their web applications are regularly updated and patched, as this vulnerability has existed since 2008 and represents a well-known weakness that has been addressed in modern security frameworks. Security monitoring should include detection of unusual file access patterns and parameter values that might indicate attempted directory traversal attacks, aligning with ATT&CK technique T1070 - Indicator Removal on Host to prevent exploitation attempts from going unnoticed.