CVE-2007-1635 in Net Portal Dynamic
Summary
by MITRE
Static code injection vulnerability in admin/settings.php in Net Portal Dynamic System (NPDS) 5.10 and earlier allows remote authenticated users to inject arbitrary PHP code via the xtop parameter in a "ConfigSave" op to admin.php, which can later be accessed via a "Configure" op to admin.php.
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Analysis
by VulDB Data Team • 10/27/2025
The vulnerability described in CVE-2007-1635 represents a critical static code injection flaw within the Net Portal Dynamic System version 5.10 and earlier. This vulnerability exists in the administrative configuration handling mechanism of the system, specifically within the admin/settings.php file. The flaw allows authenticated remote attackers to inject malicious PHP code through manipulation of the xtop parameter during configuration operations. The vulnerability's exploitation pathway begins with a ConfigSave operation targeting admin.php, where the malicious code injection occurs, followed by a subsequent Configure operation that executes the injected code. This represents a classic case of insufficient input validation and output encoding, where user-supplied parameters are directly incorporated into executable code without proper sanitization or escaping mechanisms.
The technical implementation of this vulnerability stems from improper handling of user input within the administrative interface. When an authenticated user submits configuration data through the admin.php interface, the xtop parameter is processed without adequate validation or sanitization. This creates a condition where malicious input can be interpreted as executable PHP code rather than mere data. The vulnerability is particularly concerning because it requires only authentication, making it accessible to users who have already gained access to legitimate administrative credentials. The CWE-94 weakness classification applies here, as this represents an improper neutralization of special elements used in executable content, specifically allowing arbitrary code execution through code injection. The ATT&CK framework categorizes this under T1059.007 - Command and Scripting Interpreter: PHP, indicating the exploitation of PHP execution capabilities through injected code.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with complete control over the affected system's administrative functions. Once exploited, attackers can modify system configurations, create backdoor accounts, manipulate database content, or even establish persistent access through the injected code. The vulnerability affects the integrity and confidentiality of the entire system, as the injected code can access all administrative functions and potentially escalate privileges further. The fact that this vulnerability exists in the configuration saving mechanism means that attackers can modify critical system settings, potentially leading to complete system compromise. The remote nature of the attack means that an attacker does not need physical access to the system, making this vulnerability particularly dangerous in networked environments where administrative access might be exposed to untrusted users or where credential compromise is possible through other attack vectors.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term architectural improvements. The most effective immediate solution involves patching the system to version 5.11 or later, where the input validation issues have been corrected. Organizations should implement strict input validation and sanitization for all parameters passed to administrative functions, particularly those that are used in code generation or execution contexts. The implementation of proper parameter escaping and context-aware output encoding would prevent the malicious PHP code from being executed as legitimate code. Additionally, organizations should enforce principle of least privilege for administrative accounts, ensuring that only necessary users have access to configuration functions. Regular security audits of administrative interfaces should be conducted to identify similar input validation issues. The vulnerability also highlights the importance of implementing proper access controls and monitoring for unusual administrative activities, as the injected code could be used to hide malicious activities within the system's normal operations. Organizations should also consider implementing web application firewalls to detect and block suspicious parameter values that might indicate attempted code injection attacks.