CVE-2002-0471 in PHPNetToolpack
Summary
by MITRE
PHPNetToolpack 0.1 allows remote attackers to execute arbitrary code via shell metacharacters in the a_query variable.
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Analysis
by VulDB Data Team • 09/17/2025
The vulnerability identified as CVE-2002-0471 affects PHPNetToolpack version 0.1, a network tool package written in PHP that provides various network utilities and functions for web-based environments. This flaw represents a classic command injection vulnerability that enables remote attackers to execute arbitrary code on the affected system. The vulnerability specifically manifests when the application processes user input through the a_query variable without proper sanitization or validation, creating an opportunity for malicious actors to inject shell metacharacters that get interpreted and executed by the underlying operating system.
The technical exploitation of this vulnerability occurs through the improper handling of user-supplied data within the PHP application's network tooling functions. When an attacker submits malicious input containing shell metacharacters such as semicolons, ampersands, or backticks through the a_query parameter, the application fails to properly escape or filter these characters before processing them. This allows the attacker to inject and execute arbitrary shell commands on the server hosting the PHPNetToolpack application, effectively granting them full command-line access to the system. The vulnerability directly maps to CWE-77 which describes improper neutralization of special elements used in a command, and CWE-94 which covers the execution of arbitrary code through the use of a command injection flaw.
The operational impact of this vulnerability is severe and potentially catastrophic for affected systems. An attacker who successfully exploits this vulnerability can gain complete control over the web server, potentially leading to data breaches, system compromise, and unauthorized access to sensitive information. The remote nature of the attack means that exploitation can occur from anywhere on the internet without requiring local system access or authentication. This vulnerability essentially transforms the affected web application into a backdoor that can be used to execute any command that the web server process has permissions to run, potentially allowing attackers to install malware, steal data, or use the compromised system as a launch point for further attacks within the network infrastructure.
Organizations affected by this vulnerability should immediately implement multiple layers of mitigation strategies to protect their systems. The most critical immediate action involves patching or upgrading to a version of PHPNetToolpack that properly sanitizes user input and implements proper input validation techniques. Additionally, implementing proper parameter validation, input filtering, and output encoding can prevent similar vulnerabilities from occurring in the future. Network-level protections such as web application firewalls and intrusion detection systems should be configured to monitor for suspicious command injection patterns. The remediation process should also include conducting comprehensive security assessments of all web applications to identify similar input handling vulnerabilities. This vulnerability demonstrates the importance of following secure coding practices as outlined in the OWASP Top Ten and aligns with ATT&CK technique T1059.001 for command and scripting interpreter, emphasizing the need for robust input validation and proper security controls to prevent command injection attacks. Organizations should also consider implementing principle of least privilege access controls and regular security audits to prevent unauthorized code execution in web applications.