CVE-2003-0995 in Windows
Summary
by MITRE
Buffer overflow in the Microsoft Message Queue Manager (MSQM) allows remote attackers to cause a denial of service (RPC service crash) via a queue registration request.
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Analysis
by VulDB Data Team • 09/17/2018
The vulnerability identified as CVE-2003-0995 represents a critical buffer overflow flaw within Microsoft Message Queue Manager component that operates as part of the Windows operating system infrastructure. This issue specifically affects the Remote Procedure Call (RPC) service implementation within MSQM which handles queue registration requests from remote clients. The buffer overflow occurs when the service processes malformed queue registration data, causing the RPC service to crash and resulting in a denial of service condition that disrupts legitimate messaging operations.
This technical flaw manifests as a classic stack-based buffer overflow within the MSQM service handling routine for queue registration requests. The vulnerability stems from inadequate input validation and bounds checking when processing incoming RPC messages containing queue registration information. When an attacker crafts a specially formatted queue registration request with excessive data payload, the service fails to properly validate the buffer size before copying the data into fixed-length memory buffers. This condition allows attackers to overwrite adjacent memory locations including return addresses and control data structures, ultimately leading to service termination and system instability.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise the availability of critical messaging infrastructure within enterprise networks. Organizations relying on Microsoft Message Queuing for business-critical applications face significant risk of operational downtime when this vulnerability is exploited. The remote nature of the attack means that systems can be compromised from external networks without requiring local access or authentication, making it particularly dangerous for exposed messaging services. Network administrators must consider the cascading effects of such denial of service attacks that could impact multiple dependent systems relying on message queue communications.
The vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which specifically addresses buffer overflow conditions occurring in stack memory regions. This classification indicates the flaw involves direct memory corruption through improper bounds checking during data copying operations. From an attack framework perspective, this vulnerability maps to ATT&CK technique T1499.004 for Network Denial of Service, demonstrating how adversaries can exploit service vulnerabilities to disrupt network communications. The attack surface is particularly concerning for enterprise environments where MSQM services are exposed to untrusted networks or where legacy systems may not have received timely security updates.
Mitigation strategies for this vulnerability should include immediate deployment of Microsoft security patches that address the buffer overflow in MSQM RPC service handling. Organizations must implement network segmentation to limit exposure of MSQM services to trusted internal networks only, reducing the attack surface available to external adversaries. Input validation controls should be strengthened at network boundaries to filter out malformed RPC requests before they reach vulnerable service endpoints. Regular security assessments should monitor for unpatched systems and implement network monitoring to detect anomalous queue registration patterns that may indicate exploitation attempts. Additionally, implementing proper access controls and authentication mechanisms for MSQM services can reduce the likelihood of successful exploitation while maintaining operational functionality for legitimate users.