CVE-2004-0899 in Windows
Summary
by MITRE
The DHCP Server service for Microsoft Windows NT 4.0 Server and Terminal Server Edition, with DHCP logging enabled, does not properly validate the length of certain messages, which allows remote attackers to cause a denial of service (application crash) via a malformed DHCP message, aka "Logging Vulnerability."
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Analysis
by VulDB Data Team • 03/10/2021
The vulnerability identified as CVE-2004-0899 represents a critical flaw in the Microsoft Windows NT 4.0 Server and Terminal Server Edition DHCP Server service implementation. This issue specifically manifests when DHCP logging functionality is enabled, creating a condition where the system fails to properly validate message lengths during the processing of DHCP requests. The vulnerability falls under the category of improper input validation, which is commonly categorized as CWE-129 within the Common Weakness Enumeration framework. The flaw enables remote attackers to exploit the system through the deliberate crafting of malformed DHCP messages that exceed expected parameter limits.
The technical execution of this vulnerability occurs at the network protocol level where the DHCP server service processes incoming messages without adequate bounds checking on message parameters. When a malformed DHCP message is received with oversized data fields, the logging mechanism attempts to process and record this information without proper validation, leading to buffer overflows or memory corruption conditions. This type of vulnerability is particularly dangerous as it can be exploited remotely without requiring authentication or elevated privileges, making it a prime candidate for denial of service attacks that can bring critical network infrastructure offline. The attack vector operates through standard DHCP communication protocols, leveraging the inherent trust relationships in network infrastructure to deliver malicious payloads.
The operational impact of this vulnerability extends beyond simple service disruption, as it can compromise the availability of network services critical to organizational operations. When exploited successfully, the vulnerability causes the DHCP Server service to crash and restart, potentially disrupting network connectivity for all devices relying on that server for IP address assignment and configuration. This creates cascading effects throughout the network infrastructure, as affected systems may lose connectivity and require manual intervention to restore services. The vulnerability affects Windows NT 4.0 Server and Terminal Server Edition environments, which were widely deployed in enterprise networks during the early 2000s, making it particularly concerning from a legacy system security perspective. Organizations running these older systems face significant risk exposure, as the vulnerability can be exploited by anyone with network access to send malicious DHCP packets.
Mitigation strategies for this vulnerability should prioritize immediate patching of affected systems with the appropriate Microsoft security updates. Organizations should also implement network segmentation and access controls to limit exposure of vulnerable DHCP servers to untrusted networks. Network monitoring solutions should be configured to detect anomalous DHCP traffic patterns that may indicate exploitation attempts. The implementation of DHCP snooping features and DHCP server hardening measures can provide additional protection layers. From an ATT&CK framework perspective, this vulnerability maps to the T1499.004 technique related to network denial of service attacks, and the T1071.004 technique for application layer protocol usage. Regular network audits should be conducted to identify and remediate similar input validation flaws in other network services, as this represents a common class of vulnerabilities that can lead to system instability and availability issues.