CVE-2006-1609 in Xfit S Zengin
Summary
by MITRE
Unspecified vulnerability in Hitachi XFIT/S, XFIT/S/JCA, XFIT/S/ZGN, and XFIT/S ZENGIN TCP/IP Procedure allows remote attackers to cause a denial of service (server process and transfer control process stop) when the products "receive data unexpectedly".
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Analysis
by VulDB Data Team • 09/09/2017
The vulnerability identified as CVE-2006-1609 affects Hitachi XFIT/S series products including XFIT/S/JCA, XFIT/S/ZGN, and XFIT/S ZENGIN TCP/IP implementations. This unspecified weakness resides within the TCP/IP procedure handling mechanism of these industrial control systems, specifically when processing incoming data streams. The flaw manifests as a remote denial of service condition that can be triggered by sending unexpected data to the affected systems. The vulnerability represents a critical weakness in the input validation and error handling procedures of these embedded network protocols, potentially compromising the operational integrity of industrial automation environments where these systems are deployed.
The technical nature of this vulnerability stems from inadequate data validation within the TCP/IP processing stack of Hitachi's XFIT/S products. When the system receives data that falls outside the expected parameters or format, the implementation fails to properly handle such unexpected inputs, leading to abrupt termination of server processes and transfer control processes. This behavior aligns with CWE-248, an unspecified weakness in the error handling mechanisms of software systems, where improper handling of exceptional conditions can result in system instability or complete service disruption. The vulnerability operates at the network protocol level, making it particularly dangerous as it can be exploited remotely without requiring physical access to the target systems.
The operational impact of this vulnerability extends beyond simple service interruption to potentially compromise industrial control processes that depend on continuous network connectivity. In manufacturing environments where Hitachi XFIT/S systems control critical machinery and production processes, a denial of service attack could lead to production halts, safety system failures, or cascading operational disruptions. The vulnerability affects both server processes responsible for maintaining system functionality and transfer control processes that manage data flow between different system components, creating a comprehensive service disruption scenario. This weakness directly impacts the availability aspect of the CIA triad, potentially affecting operational continuity and business critical processes in industrial settings.
Mitigation strategies for this vulnerability should focus on network segmentation and access control measures to limit exposure to untrusted network traffic. Implementing proper input validation and sanitization procedures within the TCP/IP stack would help prevent malformed data from causing process termination. Network administrators should consider deploying intrusion detection systems capable of identifying anomalous data patterns that may indicate exploitation attempts. Additionally, regular firmware updates from Hitachi should be implemented to address the underlying implementation flaws, while system monitoring should be enhanced to detect early signs of process termination or abnormal network behavior. The vulnerability demonstrates the importance of robust error handling in industrial control systems, aligning with ATT&CK technique T1499.002 for network denial of service attacks, and highlights the need for defense-in-depth strategies in critical infrastructure environments where these systems operate.