CVE-2003-1566 in IIS
Summary
by MITRE
Microsoft Internet Information Services (IIS) 5.0 does not log requests that use the TRACK method, which allows remote attackers to obtain sensitive information without detection.
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Analysis
by VulDB Data Team • 07/13/2025
Microsoft Internet Information Services version 5.0 contains a critical logging vulnerability that fundamentally undermines security monitoring capabilities. This flaw specifically affects the TRACK HTTP method which is not properly recorded in IIS server logs, creating a significant blind spot in security auditing and incident response procedures. The vulnerability stems from the server's inability to log requests that utilize the TRACK method, which is defined in the httpbis specification and used for tracking requests in certain web applications. When the TRACK method is employed, the server processes the request but fails to generate corresponding log entries, effectively allowing malicious actors to execute potentially harmful operations without leaving any trace in the system's audit trails.
The technical implementation of this vulnerability occurs at the core logging mechanism within IIS 5.0 where the server's request processing pipeline does not include proper logging for the TRACK method. This method is typically used for tracking requests in web applications and can be leveraged by attackers to probe system configurations, identify vulnerabilities, or perform reconnaissance activities without detection. The flaw operates at the application layer and affects the server's ability to maintain comprehensive audit logs, which are essential for security monitoring and compliance requirements. According to CWE-778, this represents an insufficient logging vulnerability where the system fails to record certain types of requests, making it difficult to detect unauthorized access attempts or malicious activities.
The operational impact of this vulnerability extends beyond simple information disclosure, as it creates a substantial security gap that can be exploited by threat actors to conduct prolonged reconnaissance without detection. Attackers can utilize the TRACK method to map server configurations, identify running services, and gather intelligence about the target environment while remaining invisible in the system logs. This makes the vulnerability particularly dangerous in environments where security monitoring relies heavily on log analysis and anomaly detection systems. The lack of logging for TRACK requests means that any malicious activity performed using this method cannot be correlated with other security events, making it difficult for security teams to establish attack timelines or identify the scope of potential compromises.
Organizations running IIS 5.0 systems face significant risks when this vulnerability is exploited, as it undermines the fundamental security posture of their web infrastructure. The vulnerability directly impacts compliance requirements for many regulatory frameworks that mandate comprehensive logging of all system activities, including HTTP requests. Security professionals should note that this issue aligns with ATT&CK technique T1562.001 which involves disabling or modifying system security tools, as the lack of logging effectively disables the ability to monitor for certain types of malicious activity. The vulnerability also relates to T1071.004 which covers application layer protocol usage, particularly in how web applications handle HTTP methods that are not properly logged or monitored.
Mitigation strategies for this vulnerability require immediate action including upgrading to a supported version of IIS that properly handles all HTTP methods, implementing additional monitoring solutions that can detect anomalous traffic patterns, and configuring custom logging rules to capture TRACK method requests. Organizations should also consider implementing network-based monitoring tools that can detect and alert on suspicious HTTP method usage regardless of server-side logging capabilities. The most effective long-term solution involves migrating to modern web server platforms that have robust logging mechanisms and proper support for all standard HTTP methods. Additionally, implementing network segmentation and access controls can help limit the potential damage from such vulnerabilities, while regular security assessments should include verification that all HTTP methods are properly logged and monitored.