CVE-2003-0227 in Windows
Summary
by MITRE
The logging capability for unicast and multicast transmissions in the ISAPI extension for Microsoft Windows Media Services in Microsoft Windows NT 4.0 and 2000, nsiislog.dll, allows remote attackers to cause a denial of service in Internet Information Server (IIS) and execute arbitrary code via a certain network request.
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Analysis
by VulDB Data Team • 08/22/2025
The vulnerability described in CVE-2003-0227 represents a critical security flaw within the ISAPI extension for Microsoft Windows Media Services, specifically affecting Microsoft Windows NT 4.0 and Windows 2000 systems. This vulnerability resides in the nsiislog.dll component which handles logging of both unicast and multicast network transmissions. The issue stems from improper input validation and memory handling within the logging mechanism, creating a pathway for remote attackers to exploit the system through carefully crafted network requests. The affected environment involves Internet Information Server (IIS) running on vulnerable Windows operating systems, making it particularly dangerous in enterprise network infrastructures where media streaming services are commonly deployed.
The technical exploitation of this vulnerability occurs through malformed network requests that trigger buffer overflow conditions within the nsiislog.dll module. When the logging system processes these malicious requests, it fails to properly validate the incoming data, leading to memory corruption that can be leveraged to execute arbitrary code with the privileges of the IIS service account. The denial of service component of this vulnerability manifests when the malformed requests cause the logging service to crash or become unresponsive, effectively disrupting media streaming services and potentially allowing attackers to gain unauthorized access to the system. This vulnerability directly maps to CWE-121, which describes heap-based buffer overflow conditions, and CWE-122, which covers buffer overflow vulnerabilities that can lead to arbitrary code execution. The attack vector operates over network protocols commonly used for media streaming, making it particularly insidious as it can be exploited without requiring authentication or physical access to the system.
The operational impact of CVE-2003-0227 extends beyond simple service disruption, as successful exploitation can result in complete system compromise and unauthorized access to sensitive media content. Organizations relying on Windows Media Services for content distribution face significant risks including data breaches, service interruptions, and potential lateral movement within their network infrastructure. The vulnerability affects systems where IIS is configured to handle media streaming requests, particularly those serving multimedia content to multiple clients simultaneously through both unicast and multicast protocols. Attackers can leverage this vulnerability to establish persistent access to affected systems, potentially using the compromised servers as launch points for further attacks against internal network resources. The threat landscape for this vulnerability aligns with ATT&CK technique T1059, which covers command and script interpreter usage, and T1489, which addresses denial of service through resource exhaustion or system manipulation.
Mitigation strategies for CVE-2003-0227 require immediate implementation of security patches from Microsoft, as the vulnerability was addressed through official updates that corrected the buffer overflow conditions in nsiislog.dll. Organizations should implement network segmentation to isolate media streaming services from critical internal systems and deploy intrusion detection systems to monitor for suspicious network traffic patterns associated with media streaming protocols. Access controls should be tightened to limit the exposure of IIS services to untrusted networks, while regular security assessments should verify that the vulnerability has been properly remediated. System administrators must ensure that all Windows systems running IIS and Windows Media Services are updated with the latest security patches and that proper monitoring is in place to detect potential exploitation attempts. Additionally, implementing network-based security controls such as firewalls and access control lists can help prevent unauthorized access to media streaming endpoints, while regular security audits should verify that no unauthorized modifications have been made to the affected components. The remediation process should include thorough testing of patched systems to ensure that the vulnerability has been completely resolved without introducing new operational issues.