CVE-2006-4196 in WEBInsta
Summary
by MITRE
PHP remote file inclusion vulnerability in index.php in WEBInsta CMS 0.3.1 and possibly earlier allows remote attackers to execute arbitrary PHP code via a URL in the templates_dir parameter.
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Analysis
by VulDB Data Team • 07/14/2024
The vulnerability described in CVE-2006-4196 represents a critical remote file inclusion flaw within the WEBInsta CMS version 0.3.1 and potentially earlier iterations. This issue stems from inadequate input validation mechanisms that fail to properly sanitize user-supplied parameters before incorporating them into file system operations. The specific weakness manifests in the index.php script where the templates_dir parameter accepts external URLs without sufficient verification, creating an exploitable condition that can be leveraged by malicious actors to inject and execute arbitrary PHP code on the target server.
This vulnerability directly maps to CWE-88, which describes improper neutralization of special elements used in an OS command, and CWE-94, which addresses the execution of arbitrary code or commands. The technical flaw operates by allowing an attacker to manipulate the templates_dir parameter through a URL value that points to a remote malicious script. When the web application processes this parameter, it attempts to include and execute the remote file as if it were a local template, thereby providing an execution environment for attacker-controlled code. The vulnerability is particularly dangerous because it can be exploited without authentication, allowing remote code execution directly from the attacker's server.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise and data exfiltration capabilities. An attacker who successfully exploits this vulnerability can gain unauthorized access to the web server, potentially escalating privileges to the system level depending on the server configuration. The remote file inclusion nature means that attackers can deploy backdoors, steal sensitive information, modify website content, or use the compromised server as a launching point for further attacks against the internal network. This vulnerability also facilitates persistent access to the compromised system, as attackers can establish long-term footholds through the deployed malicious files.
Mitigation strategies for CVE-2006-4196 should prioritize immediate patching of the affected WEBInsta CMS versions to address the root cause of the vulnerability. Organizations should implement input validation measures that strictly validate and sanitize all user-supplied parameters, particularly those used in file inclusion operations. The implementation of a whitelist approach for template directory parameters, where only predetermined valid paths are accepted, provides an effective defense mechanism. Additionally, configuring web servers with appropriate restrictions on remote file access and disabling dangerous PHP functions such as allow_url_include can significantly reduce the attack surface. Network monitoring solutions should be deployed to detect anomalous file inclusion patterns, while regular security audits and vulnerability assessments should be conducted to identify similar issues in other applications. The ATT&CK framework categorizes this vulnerability under T1190 for exploit public-facing application and T1059 for command and scripting interpreter, emphasizing the need for comprehensive defensive measures across multiple operational domains.