CVE-2008-6099 in RPortal
Summary
by MITRE
PHP remote file inclusion vulnerability in index.php in RPortal 1.1 and earlier allows remote attackers to execute arbitrary PHP code via a URL in the file_op parameter.
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Analysis
by VulDB Data Team • 11/05/2024
The vulnerability identified as CVE-2008-6099 represents a critical remote file inclusion flaw in RPortal version 1.1 and earlier systems. This security weakness exists within the index.php file where the application fails to properly validate or sanitize user input submitted through the file_op parameter. The vulnerability stems from the application's improper handling of external URLs, allowing malicious actors to inject and execute arbitrary PHP code on the target system. The flaw operates under CWE-98 which classifies it as "Improper Control of Generation of Code ('Code Injection')" and specifically relates to remote file inclusion attacks that fall under the ATT&CK technique T1190 for "Exploit Public-Facing Application." This vulnerability fundamentally compromises the integrity of the web application by enabling attackers to execute malicious code remotely without requiring authentication or direct system access.
The technical implementation of this vulnerability allows an attacker to manipulate the file_op parameter in the index.php script to reference external URLs containing malicious PHP code. When the vulnerable application processes this parameter, it includes and executes the remote file content as if it were part of the local application code. This creates a pathway for attackers to upload and execute backdoors, web shells, or other malicious payloads that can establish persistent access to the compromised system. The flaw essentially transforms the legitimate file inclusion functionality into a weapon for code execution, bypassing normal security controls and access restrictions. The vulnerability is particularly dangerous because it operates at the application layer and can be exploited through simple HTTP requests without requiring any special privileges or complex exploitation techniques.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise and potential data breaches. An attacker who successfully exploits this vulnerability can gain full control over the affected server, allowing them to manipulate application data, steal sensitive information, install additional malware, or use the compromised system as a launch point for further attacks against the internal network. The vulnerability affects the confidentiality, integrity, and availability of the web application and underlying system resources. Organizations running affected RPortal versions face significant risk of unauthorized access, data exfiltration, and potential regulatory compliance violations. The attack surface is broad as any user who can submit data to the vulnerable parameter can potentially exploit this weakness, making it particularly dangerous in environments with open input fields or public-facing web interfaces.
Mitigation strategies for CVE-2008-6099 require immediate action to address the root cause through proper input validation and secure coding practices. The primary remediation involves implementing strict input sanitization and validation for all user-supplied parameters, particularly those used in file inclusion operations. Organizations should disable remote file inclusion functionality entirely by configuring the PHP environment to restrict include operations to local files only. The recommended approach includes implementing whitelisting mechanisms that only permit specific, pre-approved file paths or names, and using absolute paths instead of relative paths in file inclusion operations. Additionally, the application should employ proper error handling to prevent information disclosure and implement secure coding practices such as using the include_once or require_once functions instead of include or require when possible. Organizations should also consider implementing web application firewalls to detect and block malicious requests targeting this specific vulnerability pattern. Regular security assessments and code reviews should be conducted to identify similar vulnerabilities in other parts of the application, while system administrators should monitor for unusual file access patterns or unauthorized code execution attempts that may indicate exploitation attempts. The vulnerability serves as a critical reminder of the importance of input validation and secure coding practices in preventing remote code execution attacks.