CVE-2007-1634 in Net Portal Dynamic
Summary
by MITRE
Variable extraction vulnerability in grab_globals.php in Net Portal Dynamic System (NPDS) 5.10 and earlier allows remote attackers to conduct SQL injection attacks via the _FILES[DB][tmp_name] parameter to print.php, which overwrites the $DB variable with dynamic variable evaluation.
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Analysis
by VulDB Data Team • 10/27/2025
The vulnerability described in CVE-2007-1634 represents a critical variable extraction flaw within the Net Portal Dynamic System version 5.10 and earlier. This issue stems from improper input validation and insecure variable handling mechanisms that allow remote attackers to manipulate the application's internal state. The vulnerability specifically targets the grab_globals.php component which is responsible for processing global variables and their assignment within the NPDS framework. When an attacker submits malicious input through the _FILES[DB][tmp_name] parameter to the print.php script, the system's variable extraction process becomes compromised, enabling unauthorized variable overwriting and manipulation.
The technical exploitation of this vulnerability occurs through dynamic variable evaluation mechanisms that process file upload parameters without adequate sanitization. The flaw allows attackers to manipulate the $DB variable which likely contains database connection information or credentials, enabling them to inject malicious SQL commands into the database layer. This variable extraction process operates in a manner that permits arbitrary code execution through carefully crafted file upload parameters, as the system does not properly validate or sanitize the input before assigning it to global variables. The vulnerability demonstrates a classic case of insecure deserialization and variable injection that bypasses normal input validation controls.
From an operational impact perspective, this vulnerability creates a severe risk to database integrity and system confidentiality. Remote attackers can leverage this flaw to execute arbitrary SQL commands against the underlying database, potentially leading to data theft, modification, or complete system compromise. The vulnerability's remote exploitability means that attackers do not require local system access or authentication to carry out attacks, making it particularly dangerous for publicly accessible web applications. Organizations running affected versions of NPDS face potential exposure to unauthorized data access, data corruption, and service disruption that could result in significant business impact and regulatory compliance violations.
The vulnerability aligns with CWE-95 which describes improper neutralization of directives in input that is processed by the application, and represents a variant of the broader category of insecure variable handling and dynamic code execution vulnerabilities. From an ATT&CK framework perspective, this vulnerability maps to T1059.007 for Dynamic Scripting and T1190 for Exploit Public-Facing Application, as it allows remote exploitation of a publicly accessible web application through file upload mechanisms. The attack chain typically involves initial reconnaissance to identify the vulnerable application, followed by crafting malicious file uploads that exploit the variable extraction flaw to achieve SQL injection capabilities.
Mitigation strategies for this vulnerability require immediate patching of affected NPDS installations to version 5.11 or later where the variable extraction mechanisms have been properly secured. Organizations should implement input validation and sanitization controls that prevent malicious variable assignment, particularly for file upload parameters that may be processed through global variable mechanisms. Additional protective measures include restricting file upload capabilities, implementing proper access controls for sensitive application components, and deploying web application firewalls to detect and block suspicious file upload patterns. Security monitoring should focus on identifying unusual file upload activities and SQL injection attempts that may indicate exploitation of this vulnerability. Regular security assessments and code reviews should specifically target variable handling mechanisms to prevent similar issues in future development cycles.