CVE-2005-0050 in Windows
Summary
by MITRE
The License Logging service for Windows NT Server, Windows 2000 Server, and Windows Server 2003 does not properly validate the length of messages, which leads to an "unchecked buffer" and allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code, aka the "License Logging Service Vulnerability."
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Analysis
by VulDB Data Team • 07/05/2025
The CVE-2005-0050 vulnerability represents a critical buffer overflow flaw within the License Logging service component of Microsoft Windows NT Server, Windows 2000 Server, and Windows Server 2003 operating systems. This vulnerability stems from inadequate input validation mechanisms within the service's message handling functionality, creating an unchecked buffer condition that can be exploited by remote attackers to compromise system integrity. The affected service operates as part of Windows' licensing infrastructure, responsible for tracking software usage and maintaining license compliance information across networked environments. When the service receives malformed network messages containing excessively long data payloads, it fails to properly validate the message length before processing, leading to memory corruption that manifests as system instability.
The technical exploitation of this vulnerability leverages the fundamental principle of buffer overflow attacks where attacker-controlled data exceeds the allocated buffer space, causing memory corruption that can result in either system crashes or arbitrary code execution. This flaw specifically affects the License Logging service's network communication protocol implementation, where network packets containing oversized data structures are processed without proper bounds checking. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, which occurs when data is copied into a fixed-length buffer without proper validation of the source data length. Attackers can craft malicious network messages that exceed the expected buffer size, causing the service to overwrite adjacent memory locations and potentially redirect execution flow to malicious code.
The operational impact of CVE-2005-0050 extends beyond simple denial of service scenarios to include potential system compromise and unauthorized code execution capabilities. When exploited successfully, the vulnerability allows remote attackers to crash the License Logging service, effectively disrupting license tracking functionality and potentially causing broader system instability. The attack surface is particularly concerning in enterprise environments where Windows Server systems are deployed, as the License Logging service typically runs with elevated privileges and may be accessible across network boundaries. Organizations using these older Windows versions face significant risk exposure, as the vulnerability can be exploited without authentication, making it a prime target for automated exploitation tools. The vulnerability also aligns with ATT&CK technique T1210, which describes the exploitation of remote services for privilege escalation and system compromise.
Mitigation strategies for CVE-2005-0050 should prioritize immediate patch deployment through Microsoft's security updates, as the vulnerability affects legacy Windows Server versions that are no longer supported with current security updates. Organizations should implement network segmentation to restrict access to the License Logging service ports, typically TCP 139 and 445, and disable the service entirely if license tracking functionality is not required. Network monitoring solutions should be configured to detect unusual message patterns or oversized packets targeting these specific service ports, while intrusion detection systems can be tuned to identify exploitation attempts. System administrators should also consider implementing firewall rules that block incoming connections to the affected service ports from untrusted networks, and conduct thorough vulnerability assessments to identify any systems still running unsupported Windows Server versions that may be vulnerable to similar buffer overflow conditions. The vulnerability serves as a critical reminder of the importance of maintaining current security patches and implementing proper network access controls to prevent exploitation of legacy service implementations.