CVE-2000-0247 in GNQS
Summary
by MITRE
Unknown vulnerability in Generic-NQS (GNQS) allows local users to gain root privileges.
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Analysis
by VulDB Data Team • 04/21/2026
The vulnerability identified as CVE-2000-0247 represents a critical privilege escalation flaw within the Generic-NQS (GNQS) system, a network queueing system that was widely deployed in enterprise environments during the late 1990s and early 2000s. This vulnerability specifically affects local users who already possess limited system access, enabling them to elevate their privileges to the root level without proper authentication mechanisms. The flaw demonstrates a fundamental weakness in the privilege management architecture of the GNQS service, where insufficient access controls and improper privilege validation allow unauthorized users to bypass security boundaries. Such vulnerabilities are particularly dangerous because they exploit the trust model within the system, where local users are often considered less of a threat than remote attackers, making the exploitation vector more insidious and harder to detect.
The technical nature of this vulnerability stems from improper implementation of privilege separation mechanisms within the GNQS daemon processes. When local users execute specific commands or interact with the system in predetermined ways, the underlying code fails to properly validate the user context or verify that the requesting process has legitimate authorization to perform elevated operations. This typically manifests through buffer overflow conditions, improper access control checks, or flawed privilege dropping mechanisms that allow a user process to manipulate system calls or memory structures in ways that should be restricted to privileged operations. The vulnerability aligns with CWE-276, which categorizes improper privilege management as a core security weakness, and represents a classic example of how insufficient input validation and privilege verification can create exploitable paths for local privilege escalation attacks. According to ATT&CK framework, this vulnerability would map to T1068, which covers privilege escalation through local exploits, specifically targeting the execution of malicious code with elevated privileges.
The operational impact of CVE-2000-0247 extends far beyond simple privilege escalation, as it fundamentally undermines the security posture of systems running affected GNQS implementations. Once local users achieve root access, they gain complete control over system resources, including the ability to modify system files, install malicious software, access confidential data, and potentially establish persistent backdoors. This vulnerability can be particularly devastating in multi-user environments where system administrators rely on proper privilege separation to maintain security boundaries. The attack surface is relatively narrow since it requires local access, but the consequences are severe enough that organizations with multiple users or those that grant local shell access to untrusted parties face significant exposure. System administrators must consider that once an attacker achieves root privileges through this vulnerability, they can effectively bypass all other security controls, rendering network segmentation, firewall rules, and other perimeter defenses ineffective. The vulnerability also highlights the importance of the principle of least privilege, as it demonstrates how even minimal user access can be leveraged to achieve complete system compromise when proper privilege management is absent from system design.
Mitigation strategies for CVE-2000-0247 require immediate attention from system administrators and security teams responsible for maintaining legacy GNQS installations. The most effective immediate solution involves applying vendor patches or updates that address the specific privilege escalation flaw in the GNQS implementation, though this may require careful testing due to the age of the affected systems. Organizations should also implement strict access controls limiting local user access to systems running GNQS, particularly when such systems are not properly isolated from other network resources. Regular system audits and privilege reviews become essential to identify and remove unnecessary local accounts that could potentially exploit this vulnerability. Network segmentation strategies should be employed to isolate critical systems running GNQS from other network segments, reducing the potential impact of local privilege escalation. Additionally, system monitoring should be enhanced to detect anomalous behavior that might indicate exploitation attempts, including unusual root process execution or unauthorized system modifications. The vulnerability serves as a reminder that legacy systems often contain unpatched security flaws that can be exploited by determined attackers, emphasizing the need for comprehensive security assessments of older software implementations. From a compliance perspective, this vulnerability would likely trigger alerts under various security frameworks including pci dss, iso 27001, and nist 800-53, which require organizations to maintain secure configurations and address known vulnerabilities within reasonable timeframes.