CVE-2002-0720 in Windows
Summary
by MITRE
A handler routine for the Network Connection Manager (NCM) in Windows 2000 allows local users to gain privileges via a complex attack that causes the handler to run in the LocalSystem context with user-specified code.
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Analysis
by VulDB Data Team • 12/31/2024
The vulnerability described in CVE-2002-0720 represents a critical privilege escalation flaw within the Network Connection Manager component of Windows 2000 operating systems. This issue stems from improper handling of specific network connection events that allows local attackers to execute arbitrary code with elevated privileges. The vulnerability specifically affects the NCM handler routine which is responsible for managing network connection states and events within the Windows operating system framework. When exploited, this flaw enables attackers to manipulate the execution context of the handler routine to run malicious code with LocalSystem privileges, effectively granting them complete control over the affected system.
The technical exploitation of this vulnerability requires a sophisticated attack vector that leverages the specific behavior of the Network Connection Manager service. The flaw occurs when the handler routine processes certain network events, causing it to execute in the LocalSystem security context rather than the expected user context. This misconfiguration allows attackers to inject and execute arbitrary code that would normally be restricted to privileged system processes. The attack typically involves creating specific network conditions that trigger the vulnerable handler routine, then carefully crafting the input data to cause the routine to execute malicious code with elevated privileges. This represents a classic case of privilege escalation through improper access control mechanisms within system services.
The operational impact of CVE-2002-0720 is severe and far-reaching within Windows 2000 environments, as it provides local attackers with complete system compromise capabilities. Once exploited, the vulnerability allows attackers to execute arbitrary code with the highest possible privileges, enabling them to install malware, modify system files, create new user accounts, and access sensitive data without detection. The LocalSystem context provides access to all system resources and protected areas of the Windows operating system, making this vulnerability particularly dangerous for enterprise environments where Windows 2000 servers and workstations may be present. The vulnerability also affects the integrity of the Windows security model, as it bypasses normal privilege boundaries and access controls that are fundamental to the operating system's security architecture.
From a cybersecurity perspective, this vulnerability aligns with CWE-264, which addresses permissions, privileges, and access control issues within software systems. The flaw demonstrates how improper handling of system service contexts can lead to privilege escalation, a common attack pattern that appears across numerous security frameworks including the MITRE ATT&CK matrix under privilege escalation techniques. Organizations should implement immediate mitigations including applying the relevant Microsoft security patches, disabling unnecessary network connection manager services, and implementing network segmentation to limit the attack surface. Additionally, monitoring for unusual network connection events and system process behavior can help detect exploitation attempts, while regular security assessments should verify that the vulnerability has been properly addressed through system hardening measures and access control policies.
The broader implications of this vulnerability extend beyond the immediate security concerns to highlight the importance of proper security context management in system services. This flaw demonstrates how complex interactions between different system components can create unexpected security exposure points, particularly when service handlers are not properly isolated or validated. The vulnerability also underscores the critical need for maintaining up-to-date security patches and implementing comprehensive security monitoring strategies. Organizations should consider implementing additional security controls such as mandatory access controls, process monitoring, and regular security audits to prevent similar vulnerabilities from being exploited in their environments. The incident serves as a reminder that even seemingly benign system components can become critical attack vectors when proper security controls are not implemented.