CVE-2003-0528 in Windows
Summary
by MITRE
Heap-based buffer overflow in the Distributed Component Object Model (DCOM) interface in the RPCSS Service allows remote attackers to execute arbitrary code via a malformed RPC request with a long filename parameter, a different vulnerability than CVE-2003-0352 (Blaster/Nachi) and CVE-2003-0715.
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Analysis
by VulDB Data Team • 12/31/2024
The vulnerability described in CVE-2003-0528 represents a critical heap-based buffer overflow within the Distributed Component Object Model interface of the RPCSS service on Windows systems. This flaw specifically manifests when processing Remote Procedure Call requests containing excessively long filename parameters, creating a condition where attacker-controlled data can overwrite adjacent memory regions in the heap allocation structure. The vulnerability operates at the core of Windows DCOM architecture, which enables distributed computing across network boundaries by allowing objects to execute across process and machine boundaries. The RPCSS service serves as the foundation for Remote Procedure Calls and DCOM communications, making this flaw particularly dangerous as it can be exploited to gain unauthorized code execution privileges on targeted systems.
The technical implementation of this vulnerability stems from inadequate input validation within the RPCSS service's handling of DCOM requests. When a malformed RPC request arrives with an oversized filename parameter, the service fails to properly bounds-check the input data before copying it into allocated heap memory buffers. This lack of proper validation creates a condition where the input data can overflow the allocated buffer space, potentially overwriting adjacent heap metadata, return addresses, or other critical program structures. The heap-based nature of the overflow means that attackers can manipulate memory layout to redirect execution flow, enabling arbitrary code execution with the privileges of the RPCSS service account, typically SYSTEM level access on vulnerable systems.
The operational impact of CVE-2003-0528 extends far beyond simple remote code execution, as it represents one of the earliest and most significant vulnerabilities in Windows DCOM implementations that enabled widespread automated exploitation. This vulnerability was particularly dangerous because it required no user interaction or authentication, making it susceptible to exploitation by automated worms and malware. The flaw's exploitation capabilities align with attack patterns described in the MITRE ATT&CK framework under the T1203 and T1059 techniques, where adversaries leverage system services and command execution to establish persistent access. The vulnerability's classification as a heap overflow maps directly to CWE-121, which describes heap-based buffer overflow conditions, and its exploitation methods correspond to CWE-787, which addresses out-of-bounds writes in heap memory. The impact of exploitation typically results in complete system compromise, allowing attackers to install backdoors, exfiltrate data, or establish persistent command and control infrastructure.
Mitigation strategies for CVE-2003-0528 require a multi-layered approach focusing on both immediate remediation and long-term security hardening. The primary recommendation involves applying Microsoft's security patches released in response to this vulnerability, specifically the Windows 2000 and Windows XP patches that address the DCOM RPCSS service buffer overflow. Network segmentation and firewall rules should be implemented to restrict access to RPC ports, particularly port 135 and dynamic RPC ports, limiting exposure to potential attackers. System administrators should disable unnecessary DCOM functionality and services, reducing the attack surface available to exploiters. The implementation of intrusion detection systems with signature-based detection for known exploit patterns can provide additional monitoring capabilities. Additionally, regular security assessments and vulnerability scanning should be conducted to identify any remaining vulnerable systems or misconfigurations, while maintaining current threat intelligence feeds to stay informed about related attack vectors and exploitation techniques that may target similar DCOM vulnerabilities.