CVE-2006-5510 in PH Pexplorer
Summary
by MITRE
Directory traversal vulnerability in explorer_load_lang.php in PH Pexplorer 0.24 allows remote attackers to include arbitrary local files via ".." sequences in the Language cookie, as demonstrated by uploading a .gif file that contains PHP code.
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Analysis
by VulDB Data Team • 04/25/2026
The vulnerability identified as CVE-2006-5510 represents a critical directory traversal flaw within the PHPexplorer 0.24 web application's language loading mechanism. This issue resides in the explorer_load_lang.php component which processes user-supplied input through the Language cookie parameter without proper sanitization or validation. The vulnerability enables remote attackers to manipulate file inclusion paths by exploiting the .. sequence characters that are commonly used to navigate up directory levels in file systems. This particular implementation flaw allows adversaries to bypass normal access controls and potentially execute arbitrary code on the target system.
The technical exploitation of this vulnerability follows a specific attack pattern that aligns with CWE-22 directory traversal weakness category. When the PHPexplorer application processes the Language cookie value, it directly incorporates this input into file inclusion operations without adequate input validation or path normalization. Attackers can craft malicious cookie values containing sequences like ../../../etc/passwd or similar directory traversal patterns to access files outside the intended web root directory. In the demonstrated attack scenario, the vulnerability was exploited by uploading a .gif file containing PHP code, which when accessed through the vulnerable directory traversal mechanism could be executed as PHP code, effectively providing a remote code execution capability.
The operational impact of this vulnerability extends beyond simple information disclosure to encompass full system compromise capabilities. Since the vulnerability allows for arbitrary local file inclusion, attackers can potentially access sensitive system files, configuration data, or application source code that may contain database credentials, encryption keys, or other sensitive information. The ability to upload and execute PHP code through a .gif file demonstrates the severity of the flaw, as it enables attackers to establish persistent backdoors, exfiltrate data, or perform further reconnaissance activities within the compromised environment. This vulnerability essentially provides an attacker with a foothold that can be leveraged for privilege escalation and lateral movement within networked environments.
Mitigation strategies for CVE-2006-5510 should focus on implementing robust input validation and sanitization mechanisms throughout the application's codebase. The most effective immediate solution involves implementing proper path validation that prevents directory traversal sequences from being processed in file inclusion operations. This approach aligns with ATT&CK technique T1059.007 for command and scripting interpreter usage and addresses the fundamental flaw in the application's input handling. Organizations should also implement proper access controls and file permissions that limit the ability of uploaded files to be executed as code. Additionally, the application should be updated to a newer version of PHPexplorer that addresses this vulnerability, as the original version 0.24 is no longer maintained and likely contains additional unpatched security issues. Regular security audits and input validation testing should be conducted to identify similar vulnerabilities in other components of the web application stack.