CVE-2008-6491 in PHPGKit
Summary
by MITRE
PHP remote file inclusion vulnerability in connexion.php in PHPGKit 0.9 allows remote attackers to execute arbitrary PHP code via a URL in the DOCUMENT_ROOT parameter. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.
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Analysis
by VulDB Data Team • 09/15/2025
The vulnerability identified as CVE-2008-6491 represents a critical remote file inclusion flaw in PHPGKit 0.9's connexion.php script that fundamentally compromises application security through improper input validation. This vulnerability resides in the handling of the DOCUMENT_ROOT parameter, which is processed without adequate sanitization or validation, creating an avenue for malicious actors to inject and execute arbitrary PHP code on the target server. The flaw directly enables attackers to leverage remote code execution capabilities by manipulating the DOCUMENT_ROOT variable to reference external malicious URLs, effectively bypassing local security controls and potentially gaining complete server access.
The technical implementation of this vulnerability stems from PHP's dynamic include functionality, where the DOCUMENT_ROOT parameter is likely used in an include or require statement without proper validation of the input source. When an attacker supplies a malicious URL as the DOCUMENT_ROOT value, the PHP application processes this input directly within the include statement, allowing remote code execution. This type of vulnerability falls under CWE-88, known as "Argument Injection," where untrusted data is passed to a function that executes code, and specifically aligns with CWE-94, "Improper Control of Generation of Code," which encompasses code injection vulnerabilities. The attack vector operates through the standard HTTP protocol, making it accessible to remote adversaries who can craft malicious requests to exploit the vulnerable parameter.
The operational impact of this vulnerability is severe and multifaceted, potentially allowing attackers to execute arbitrary commands on the target system with the privileges of the web server process. Successful exploitation could lead to complete system compromise, data exfiltration, privilege escalation, and the establishment of persistent backdoors within the affected environment. The vulnerability affects the integrity and confidentiality of the web application and underlying system, as attackers can access sensitive data, modify application behavior, and potentially use the compromised server as a launch point for further attacks within the network infrastructure. Organizations running PHPGKit 0.9 are at risk of unauthorized access, data breaches, and potential regulatory violations due to the exposure of critical system resources.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security hardening measures. The primary fix involves implementing strict input validation and sanitization for all parameters that are used in include or require statements, ensuring that only trusted and validated paths are accepted. Security patches should be applied immediately to update PHPGKit to a version that addresses this vulnerability, as the original version appears to lack proper input validation mechanisms. Additionally, implementing proper parameter validation through whitelisting approaches, where only predefined safe values are accepted, can prevent malicious inputs from being processed. Network-level protections such as web application firewalls and intrusion detection systems should be configured to monitor and block suspicious requests containing potentially malicious URL patterns. The ATT&CK framework categorizes this vulnerability under T1190 "Exploit Public-Facing Application" and T1059.007 "Command and Scripting Interpreter: PHP," highlighting the importance of application security controls and input validation as critical defensive measures against such remote code execution threats.