CVE-2008-4322 in RealWin Server
Summary
by MITRE
Stack-based buffer overflow in RealFlex Technologies Ltd. RealWin Server 2.0, as distributed by DATAC, allows remote attackers to execute arbitrary code via a crafted FC_INFOTAG/SET_CONTROL packet.
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Analysis
by VulDB Data Team • 12/30/2024
The vulnerability described in CVE-2008-4322 represents a critical stack-based buffer overflow flaw within the RealWin Server 2.0 software developed by RealFlex Technologies Ltd. This issue was specifically identified in a version distributed by DATAC and affects the server's handling of network packets, creating a significant security risk for systems that rely on this software for industrial control or data acquisition purposes. The vulnerability exists in the protocol processing logic where the server fails to properly validate the length of incoming FC_INFOTAG/SET_CONTROL packets before copying data to a fixed-size stack buffer.
The technical implementation of this flaw involves the server's network protocol handler failing to perform adequate bounds checking on user-supplied data within the FC_INFOTAG/SET_CONTROL packet structure. When a maliciously crafted packet is received, the server attempts to copy the packet data into a stack buffer without verifying that the incoming data length exceeds the buffer's allocated size. This condition results in a classic stack-based buffer overflow where the excess data overwrites adjacent memory locations including return addresses and control data, enabling attackers to manipulate the program execution flow. The vulnerability is particularly dangerous because it allows remote code execution without requiring authentication, making it accessible to any attacker who can send packets to the target server.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with complete control over the affected server system. The remote exploitation capability means that adversaries can execute arbitrary commands with the privileges of the running server process, potentially leading to full system compromise, data exfiltration, or use as a pivot point for attacks against other systems within the network. Given that RealWin Server 2.0 is typically deployed in industrial environments for real-time data acquisition and control systems, successful exploitation could result in operational disruptions, safety hazards, or unauthorized access to critical infrastructure components. The vulnerability's classification aligns with CWE-121 stack-based buffer overflow, which is categorized under the broader category of CWE-119 memory safety errors, and represents a significant weakness in the software's input validation mechanisms.
Organizations affected by this vulnerability should immediately implement mitigation strategies including network segmentation to isolate the affected servers from untrusted networks, deployment of intrusion detection systems to monitor for suspicious FC_INFOTAG/SET_CONTROL traffic patterns, and application of vendor patches if available. The ATT&CK framework categorizes this vulnerability under the technique T1203 Exploitation for Client Execution, and potentially T1059 Command and Scripting Interpreter, as attackers would need to craft and deliver malicious packets to achieve their objectives. System administrators should also consider implementing network access controls to restrict communication to only trusted sources, and regular security assessments should be conducted to identify similar vulnerabilities in other industrial control system software. The vulnerability demonstrates the critical importance of proper input validation and memory safety practices in embedded systems and industrial software environments where security considerations may be overlooked in favor of functional requirements.