CVE-2004-1963 in Network Query Tool
Summary
by MITRE
nqt.php in Network Query Tool (NQT) 1.6 allows remote attackers to obtain sensitive information via a string in the portNum parameter, which reveals the full path in an error message.
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Analysis
by VulDB Data Team • 07/06/2017
The vulnerability identified as CVE-2004-1963 affects the Network Query Tool (NQT) version 1.6, specifically within the nqt.php component. This issue represents a classic path disclosure vulnerability that occurs when error messages inadvertently reveal sensitive system information to remote attackers. The vulnerability manifests when a malicious actor submits a specially crafted string through the portNum parameter, triggering an error response that exposes the full server path where the application is installed. Such path disclosure vulnerabilities fall under the Common Weakness Enumeration category CWE-209, which specifically addresses the exposure of sensitive information through error messages. The Network Query Tool is a utility designed for network diagnostics and querying, making it a potential target for attackers seeking to gather intelligence about the underlying infrastructure.
The technical flaw stems from inadequate input validation and error handling within the nqt.php script. When the portNum parameter receives an unexpected or malformed input, the application fails to properly sanitize the error message before displaying it to the user. This lack of proper error handling allows the full filesystem path to be exposed in the HTTP response, creating a significant information disclosure risk. The vulnerability demonstrates poor secure coding practices where developers did not implement proper exception handling or input sanitization mechanisms. According to ATT&CK framework category T1212, this vulnerability aligns with the technique of "Exploitation for Information Disclosure" where adversaries leverage application flaws to extract sensitive data. The exposure of the full path can provide attackers with crucial information about the server's file structure, potentially enabling further exploitation techniques such as local file inclusion attacks or directory traversal attempts.
The operational impact of this vulnerability extends beyond simple information disclosure, as it significantly weakens the overall security posture of systems running the affected NQT version. Attackers who discover this vulnerability can map the server's directory structure, identify installed software versions, and potentially locate other sensitive files or directories that might be accessible through the same application. This information can be leveraged to plan more sophisticated attacks, such as exploiting known vulnerabilities in other software components or conducting targeted attacks against specific system configurations. The vulnerability affects the confidentiality aspect of the CIA triad by exposing system information that should remain private. Organizations using this tool may face increased risk of subsequent attacks, as the disclosed path information can serve as a foundation for more advanced exploitation techniques. The impact is particularly severe in environments where the application runs with elevated privileges or where the disclosed paths lead to sensitive configuration files or database connection details.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and error handling procedures. The primary fix involves modifying the nqt.php script to sanitize all user inputs and ensure that error messages do not contain sensitive path information. Organizations should implement generic error handling that masks specific system details in error responses, following the principle of least privilege in error reporting. Security measures should include configuring the web server to suppress detailed error messages and implementing proper logging mechanisms that capture security-relevant events without exposing system internals. The solution aligns with security best practices outlined in OWASP Top Ten and ISO 27001 standards for information security management. Additionally, regular security assessments and code reviews should be conducted to identify similar vulnerabilities in other applications. System administrators should also consider implementing network segmentation and access controls to limit the potential impact of information disclosure attacks, while ensuring that all software components are kept up to date with the latest security patches. The vulnerability serves as a reminder of the critical importance of secure coding practices and proper error handling in preventing information disclosure attacks that can compromise entire system architectures.