CVE-2008-6761 in Flexcustomer0.0.6
Summary
by MITRE
Static code injection vulnerability in admin/install.php in Flexcustomer 0.0.6 might allow remote attackers to inject arbitrary PHP code into const.inc.php via the installdbname parameter (aka the Database Name field). NOTE: the installation instructions specify deleting admin/install.php.
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Analysis
by VulDB Data Team • 11/21/2024
The vulnerability identified as CVE-2008-6761 represents a critical static code injection flaw within the Flexcustomer content management system version 0.0.6. This security weakness exists in the administrative installation script located at admin/install.php and specifically targets the database name parameter handling. The flaw allows remote attackers to inject malicious PHP code directly into the const.inc.php configuration file through improper input validation and sanitization of the installdbname parameter. The vulnerability's severity is amplified by the fact that the installation process is typically executed in a web-accessible environment, making it readily exploitable by unauthorized users who can access the installation interface.
The technical implementation of this vulnerability stems from inadequate parameter validation within the installation script where user-supplied input from the Database Name field is directly processed and written to the configuration file without proper sanitization or escaping mechanisms. When an attacker submits malicious PHP code through the installdbname parameter, this code gets executed during the installation process and subsequently written to the const.inc.php file, effectively creating a persistent backdoor or code execution mechanism within the target system. This type of vulnerability maps directly to CWE-94, which describes the improper execution of code due to inadequate input validation and sanitization. The flaw demonstrates poor secure coding practices where dynamic content is directly incorporated into executable code without proper contextual escaping or validation.
The operational impact of this vulnerability extends beyond simple code injection, as it fundamentally compromises the integrity and security posture of the entire Flexcustomer installation. Once successfully exploited, attackers can establish persistent access to the system, potentially leading to complete system compromise, data exfiltration, or further lateral movement within the network. The vulnerability's exploitation is particularly concerning because it occurs during the initial installation phase when system administrators are typically focused on configuration rather than security considerations. The attack vector is straightforward and requires minimal technical expertise, making it attractive to both skilled and unskilled attackers. According to ATT&CK framework category T1059.007, this vulnerability enables command and control through script injection, while T1546.001 addresses the persistence mechanism that can be established through file modification. The risk is further compounded by the fact that the installation instructions explicitly recommend deleting the install.php file, suggesting that administrators should not leave this vulnerable component accessible in production environments.
The recommended mitigation strategies for CVE-2008-6761 involve immediate removal of the vulnerable installation script from production environments, implementation of proper input validation and sanitization for all user-supplied parameters, and deployment of web application firewalls to detect and prevent malicious injection attempts. System administrators should also conduct thorough security audits of all installation and configuration scripts to identify similar vulnerabilities. The vulnerability highlights the critical importance of following secure coding practices and implementing defense-in-depth strategies that include input validation, privilege separation, and regular security assessments. Organizations should also consider implementing automated vulnerability scanning tools that can detect such injection vulnerabilities in web applications, particularly during the development and deployment phases. Additionally, the principle of least privilege should be enforced by ensuring that installation scripts are not accessible to unauthorized users and that all configuration files are properly secured with appropriate access controls. The vulnerability serves as a reminder that even seemingly benign administrative components can present significant security risks when proper security controls are not implemented.