CVE-2004-0116 in Windows
Summary
by MITRE
An Activation function in the RPCSS Service involved with DCOM activation for Microsoft Windows 2000, XP, and 2003 allows remote attackers to cause a denial of service (memory consumption) via an activation request with a large length field.
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Analysis
by VulDB Data Team • 01/02/2025
The vulnerability described in CVE-2004-0116 represents a critical flaw in the Remote Procedure Call Server service known as RPCSS that governs DCOM activation processes within Microsoft Windows operating systems. This issue affects Windows 2000, XP, and 2003 platforms where the RPCSS service handles activation requests for distributed COM objects. The vulnerability stems from inadequate input validation within the activation function that processes DCOM activation requests, creating a scenario where malformed activation requests can trigger excessive memory consumption. The specific flaw occurs when an attacker crafts an activation request containing an unusually large length field, which the RPCSS service fails to properly validate or limit before processing. This design weakness allows for a denial of service condition where the service consumes excessive system resources, ultimately leading to system instability and potential unavailability of the affected service.
The technical implementation of this vulnerability exploits the fundamental architecture of DCOM activation mechanisms where RPCSS acts as the central coordinator for COM object activation across network boundaries. When a client sends an activation request to a remote COM object, the RPCSS service processes this request through its activation functions, which are responsible for allocating memory resources for the COM object instantiation. The flaw manifests when the length field within the activation request is manipulated to contain an extraordinarily large value, causing the RPCSS service to allocate memory proportional to this inflated size parameter. This type of vulnerability maps directly to CWE-122, which describes buffer overflow conditions where insufficient checks on buffer sizes lead to memory allocation issues. The attack vector specifically targets the service-side processing of DCOM activation requests, where the RPCSS service does not adequately validate the legitimacy of the length field before proceeding with memory allocation operations. This vulnerability falls under the ATT&CK technique T1499.004 for network denial of service, as it specifically targets service availability through memory exhaustion.
The operational impact of CVE-2004-0116 extends beyond simple service disruption to potentially compromise entire system availability and stability. When exploited, the vulnerability allows remote attackers to consume system memory resources at an accelerated rate, causing the RPCSS service to either crash or become unresponsive, thereby preventing legitimate DCOM activation requests from being processed. This can result in cascading failures throughout the Windows environment as various applications and services that depend on DCOM functionality become inaccessible. The memory consumption pattern creates a resource exhaustion condition that can affect not only the RPCSS service but also other system processes that compete for memory resources. In enterprise environments, this vulnerability can be particularly damaging as it can affect critical infrastructure services that rely on DCOM for inter-process communication and distributed computing operations. The attack requires minimal privileges and can be executed remotely, making it a significant threat vector for unauthorized users seeking to disrupt services.
Mitigation strategies for this vulnerability should focus on both immediate protective measures and long-term architectural improvements. The most effective immediate solution involves applying the security patches released by Microsoft as part of their regular security updates, specifically addressing the RPCSS service memory handling issues. System administrators should also implement network-level restrictions to limit DCOM activation requests to trusted networks and implement proper access controls for RPC services. Network segmentation and firewall rules can help prevent unauthorized access to DCOM ports and services, reducing the attack surface for this vulnerability. Additionally, monitoring and logging of RPCSS service activities can help detect anomalous activation requests that might indicate exploitation attempts. The implementation of input validation controls within the RPCSS service configuration can provide additional protection layers against malformed activation requests. Organizations should also consider implementing intrusion detection systems that can identify patterns associated with this specific vulnerability, enabling proactive threat detection and response. Regular security assessments and vulnerability scanning should include checks for proper RPCSS service configuration and memory handling practices to ensure ongoing protection against similar issues.