CVE-2006-5766 in Article System
Summary
by MITRE
PHP remote file inclusion vulnerability in volume.php in Article System 0.6 allows remote attackers to execute arbitrary PHP code via a URL in the config[public_dir] parameter.
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Analysis
by VulDB Data Team • 04/26/2026
The vulnerability identified as CVE-2006-5766 represents a critical remote file inclusion flaw within the Article System 0.6 web application, specifically affecting the volume.php script. This vulnerability stems from inadequate input validation and sanitization mechanisms that fail to properly restrict user-supplied data from being directly incorporated into file inclusion operations. The flaw exists in the config[public_dir] parameter which accepts external URL inputs without proper validation, creating an avenue for malicious actors to inject and execute arbitrary PHP code on the target server. Such vulnerabilities fall under the broader category of CWE-98 - Improper Control of Generation of Code, which specifically addresses situations where user-controllable data is used to generate executable code without proper sanitization.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious URL and passes it through the config[public_dir] parameter to the volume.php script. When the application processes this input and attempts to include the specified file, the remote file inclusion mechanism executes the attacker-controlled code with the privileges of the web server process. This allows for complete system compromise, enabling attackers to perform actions such as arbitrary file read/write operations, command execution, privilege escalation, and data exfiltration. The vulnerability's impact is amplified by the fact that it operates at the application level, bypassing traditional network-based security controls and potentially providing attackers with persistent access to the affected system. This type of vulnerability is categorized under the ATT&CK technique T1505.003 - Server-side Include, which specifically targets server-side code injection vulnerabilities.
The operational impact of CVE-2006-5766 extends beyond simple code execution to encompass full system compromise and potential lateral movement within network environments. Once exploited, attackers can establish backdoors, deploy additional malware, scan internal networks, and harvest sensitive data from the compromised system. The vulnerability's remote nature means that attackers do not require physical access or prior authentication to exploit the flaw, making it particularly dangerous in publicly accessible web applications. Organizations running Article System 0.6 are at significant risk of data breaches, service disruption, and regulatory compliance violations. The vulnerability demonstrates a critical failure in input validation practices and highlights the importance of implementing proper secure coding methodologies. The attack vector is particularly concerning because it requires minimal technical expertise to exploit, making it attractive to both skilled and less experienced attackers.
Mitigation strategies for CVE-2006-5766 must address the root cause through comprehensive input validation and secure coding practices. The primary remediation involves implementing strict input validation that rejects any non-local file paths and ensures that user-supplied data cannot be used to construct file inclusion operations. Organizations should implement whitelisting mechanisms that only permit specific, predefined directories and files to be included, rather than allowing arbitrary URL inputs. Additionally, disabling remote file inclusion functionality entirely through php.ini configuration settings can prevent exploitation. The implementation of proper error handling and logging mechanisms helps detect and respond to exploitation attempts. Security measures should also include regular code reviews, vulnerability assessments, and ensuring that all web applications are updated to the latest versions with appropriate security patches. Organizations should consider implementing web application firewalls and intrusion detection systems to monitor for exploitation attempts. The vulnerability underscores the necessity of following secure coding guidelines and adheres to the principle of least privilege, ensuring that web applications operate with minimal required permissions to reduce the potential impact of successful exploitation attempts.