CVE-2003-0003 in Windows
Summary
by MITRE
Buffer overflow in the RPC Locator service for Microsoft Windows NT 4.0, Windows NT 4.0 Terminal Server Edition, Windows 2000, and Windows XP allows local users to execute arbitrary code via an RPC call to the service containing certain parameter information.
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Analysis
by VulDB Data Team • 08/26/2025
The vulnerability identified as CVE-2003-0003 represents a critical buffer overflow flaw within the Remote Procedure Call (RPC) Locator service component of Microsoft Windows operating systems. This vulnerability affects multiple versions including Windows NT 4.0, Windows NT 4.0 Terminal Server Edition, Windows 2000, and Windows XP, creating a widespread attack surface that spans several generations of Microsoft's server and desktop operating systems. The RPC Locator service serves as a critical infrastructure component that facilitates distributed computing operations by enabling applications to locate and communicate with RPC servers across network boundaries.
The technical flaw manifests when the RPC Locator service processes incoming RPC calls that contain malformed parameter information exceeding the allocated buffer space. This buffer overflow condition occurs due to insufficient input validation and boundary checking within the service's parameter handling routines. When an attacker sends an RPC request with oversized parameter data, the service fails to properly validate the input length before copying the data into fixed-size memory buffers, resulting in memory corruption that can be exploited to overwrite adjacent memory locations. The vulnerability specifically affects the service's ability to handle parameter information in RPC calls, making it particularly dangerous as it requires no authentication to exploit and can be triggered through legitimate network communication channels.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides local attackers with the ability to execute arbitrary code with the privileges of the RPC Locator service account. This typically translates to system-level compromise, allowing attackers to gain complete control over affected systems. The vulnerability's exploitation potential aligns with CWE-121, which describes stack-based buffer overflow conditions, and can be mapped to ATT&CK technique T1059.007 for command and scripting interpreter execution. The attack vector requires local access to the target system, making it particularly concerning for environments where local privilege escalation is possible through legitimate user accounts or compromised credentials. The widespread nature of affected operating systems means that organizations running these legacy platforms face significant risk exposure.
Mitigation strategies for CVE-2003-0003 should prioritize immediate patch deployment through Microsoft's security updates, as the vulnerability was addressed through official patches released in 2003. Organizations should implement network segmentation to limit access to RPC services and disable unnecessary RPC components where possible. System administrators should configure access controls to restrict RPC Locator service access to authorized users only, and implement monitoring solutions to detect anomalous RPC traffic patterns. The vulnerability demonstrates the importance of proper input validation and memory management practices, aligning with security best practices outlined in the CWE top 25 software weaknesses. Additionally, organizations should conduct comprehensive vulnerability assessments to identify all systems running affected Windows versions and ensure complete remediation through proper patch management processes.