CVE-2008-5171 in phpBLASTER CMS
Summary
by MITRE
Multiple directory traversal vulnerabilities in admin/minibb/index.php in phpBLASTER CMS 1.0 RC1, when register_globals is enabled, allow remote attackers to include and execute arbitrary local files via directory traversal sequences in the (1) DB, (2) lang, and (3) skin parameters.
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Analysis
by VulDB Data Team • 10/30/2024
The vulnerability identified as CVE-2008-5171 represents a critical directory traversal flaw within the phpBLASTER CMS 1.0 RC1 administration interface. This vulnerability specifically affects the admin/minibb/index.php script and exploits the dangerous combination of insecure input handling and the deprecated register_globals PHP configuration setting. The flaw manifests through three distinct parameter vectors including DB, lang, and skin parameters, each susceptible to manipulation through directory traversal sequences that can bypass normal file access controls.
This vulnerability falls under the CWE-22 category, classified as "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')", which is a fundamental security weakness that allows attackers to access files outside the intended directory structure. The technical implementation of this flaw leverages the register_globals setting, which automatically creates PHP variables from request data, creating an environment where user-supplied input can directly influence the application's file inclusion behavior without proper sanitization or validation.
The operational impact of this vulnerability is severe and multifaceted, as it provides remote attackers with the capability to execute arbitrary local code on the affected server. By manipulating the DB, lang, and skin parameters through directory traversal sequences, an attacker can potentially access sensitive system files, configuration data, and ultimately gain complete control over the web application and underlying server. This represents a privilege escalation vulnerability that can lead to full system compromise, data exfiltration, and persistence mechanisms within the compromised environment.
The attack vector exploits the fundamental weakness in input validation where the application fails to properly sanitize user-supplied parameters before using them in file inclusion operations. This weakness is exacerbated by the presence of register_globals, which transforms HTTP request parameters into accessible PHP variables without any security controls, making it trivial for attackers to manipulate the application's behavior through crafted URL parameters. The vulnerability demonstrates a classic case of insecure file handling practices that violate the principle of least privilege and proper input validation.
Mitigation strategies for this vulnerability require immediate implementation of multiple security controls. The primary recommendation involves disabling the register_globals PHP setting, which is a fundamental configuration change that eliminates one of the core conditions enabling this attack. Additionally, comprehensive input validation and sanitization must be implemented across all file inclusion parameters, ensuring that directory traversal sequences are properly rejected or neutralized. The application should employ absolute path validation, implement proper file access controls, and utilize secure coding practices that prevent user input from directly influencing file system operations. Organizations should also consider implementing web application firewalls and input filtering mechanisms to provide additional layers of protection against similar directory traversal attacks. This vulnerability highlights the critical importance of following secure coding guidelines and maintaining up-to-date security configurations as outlined in various cybersecurity frameworks and best practices.