CVE-2017-6023 in Automation PLC Ethernet Module
Summary
by MITRE
An issue was discovered in Fatek Automation PLC Ethernet Module. The affected Ether_cfg software configuration tool runs on the following Fatek PLCs: CBEH versions prior to V3.6 Build 170215, CBE versions prior to V3.6 Build 170215, CM55E versions prior to V3.6 Build 170215, and CM25E versions prior to V3.6 Build 170215. A stack-based buffer overflow vulnerability has been identified, which may allow remote code execution or crash the affected device.
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Analysis
by VulDB Data Team • 08/19/2020
The CVE-2017-6023 vulnerability represents a critical stack-based buffer overflow flaw in the Ether_cfg software configuration tool used for Fatek Automation PLC Ethernet modules. This vulnerability affects multiple PLC models including CBEH, CBE, CM55E, and CM25E series devices operating with firmware versions prior to V3.6 Build 170215. The issue stems from inadequate input validation within the configuration tool's network communication handling mechanisms, creating a pathway for malicious actors to exploit the system through remote network access. The vulnerability specifically manifests when the Ether_cfg tool processes network packets containing malformed data that exceeds allocated buffer boundaries, leading to memory corruption and potential system compromise.
The technical implementation of this vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which occurs when a program writes data beyond the bounds of a fixed-length buffer allocated on the stack. In the context of industrial control systems, this flaw represents a significant security risk as it enables remote code execution capabilities that could fundamentally compromise the integrity of critical infrastructure operations. The stack-based nature of the vulnerability means that attackers can overwrite return addresses and control flow information, potentially allowing them to execute arbitrary code with the privileges of the running configuration tool process. This type of vulnerability is particularly dangerous in industrial environments where PLCs control physical processes and systems that require continuous operation and security.
The operational impact of CVE-2017-6023 extends beyond simple system crashes to potentially enable complete system compromise and unauthorized access to industrial control networks. An attacker exploiting this vulnerability could gain remote execution privileges on affected PLC devices, potentially allowing them to modify control logic, disrupt operations, or cause physical damage to industrial processes. The vulnerability's remote exploitability means that attackers do not require physical access to the devices, making it particularly concerning for operational technology environments where security boundaries may be less defined. This type of vulnerability directly impacts the availability, integrity, and confidentiality of industrial control systems, potentially affecting critical infrastructure sectors including manufacturing, energy, and water treatment facilities.
The mitigation strategies for CVE-2017-6023 primarily focus on firmware updates and network segmentation measures to reduce the attack surface. Organizations should immediately apply the firmware updates provided by Fatek for all affected PLC models to address the buffer overflow vulnerability. Network segmentation should be implemented to isolate PLC devices from general corporate networks, reducing the potential attack vectors available to threat actors. Additionally, implementing network monitoring and intrusion detection systems can help identify suspicious network traffic patterns that may indicate exploitation attempts. From an ATT&CK framework perspective, this vulnerability relates to techniques such as T1210 Exploitation of Remote Services and T1059 Command and Scripting Interpreter, as it enables remote code execution through network-based attacks. Regular security assessments and vulnerability scanning of industrial control systems should be conducted to identify and remediate similar vulnerabilities before they can be exploited by adversaries.