CVE-2006-4190 in AutoHTML module
Summary
by MITRE
Directory traversal vulnerability in autohtml.php in the AutoHTML module for PHP-Nuke allows local users to include arbitrary files via a .. (dot dot) in the name parameter for a modload operation.
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Analysis
by VulDB Data Team • 09/25/2017
The vulnerability described in CVE-2006-4190 represents a classic directory traversal flaw within the AutoHTML module of PHP-Nuke, a widely used content management system and web application framework. This security weakness specifically affects the autohtml.php script which processes module loading operations through the modload functionality. The vulnerability arises from insufficient input validation and sanitization of user-supplied parameters, particularly the name parameter that controls which module to load. Attackers can exploit this by manipulating the name parameter to include directory traversal sequences such as .. which allows them to navigate outside the intended directory structure and access arbitrary files on the server filesystem.
This directory traversal vulnerability falls under the CWE-22 category of Improper Limitation of a Pathname to a Restricted Directory, commonly known as Path Traversal or Directory Traversal. The flaw enables local users to include arbitrary files through the modload operation, which can lead to unauthorized access to sensitive system files, configuration data, or even execution of malicious code. The vulnerability is particularly concerning because it allows attackers to bypass normal access controls and potentially gain access to files that should be restricted, including but not limited to database configuration files, administrative credentials, or other sensitive application components. The exploitation requires minimal privileges and can be performed through simple parameter manipulation in the HTTP request.
The operational impact of this vulnerability extends beyond simple file access, as it can enable attackers to perform a range of malicious activities including but not limited to arbitrary code execution, data exfiltration, and privilege escalation. When combined with other vulnerabilities or attack vectors, this directory traversal flaw can serve as a stepping stone for more sophisticated attacks. The vulnerability affects systems running PHP-Nuke with the AutoHTML module enabled, potentially compromising thousands of web applications that rely on this framework. The attack surface is significant since many legacy PHP-Nuke installations may not have received security updates or patches, making them vulnerable to exploitation.
Mitigation strategies for this vulnerability should include immediate application of security patches from the PHP-Nuke vendor or community, proper input validation and sanitization of all user-supplied parameters, and implementation of secure coding practices that prevent directory traversal attacks. Organizations should also consider implementing web application firewalls and input filtering mechanisms to detect and block suspicious traversal sequences. The remediation approach should align with defensive security measures outlined in the ATT&CK framework under the T1059.007 technique for Command and Scripting Interpreter, as well as T1078.004 for Valid Accounts. Additionally, regular security audits and vulnerability assessments should be conducted to identify and address similar weaknesses in other components of the application stack, ensuring comprehensive protection against path traversal and related file inclusion vulnerabilities that could compromise system integrity and data confidentiality.