CVE-2023-7243 in Ethercat Zeek Plugin
Summary
by MITRE • 03/01/2024
Industrial Control Systems Network Protocol Parsers (ICSNPP) - Ethercat Zeek Plugin versions d78dda6 and prior are vulnerable to out-of-bounds write while analyzing specific Ethercat datagrams. This could allow an attacker to cause arbitrary code execution.
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Analysis
by VulDB Data Team • 03/13/2024
The vulnerability identified as CVE-2023-7243 affects the Industrial Control Systems Network Protocol Parsers ICSNPP Ethercat Zeek plugin, specifically versions d78dda6 and earlier. This issue resides within the network protocol analysis capabilities designed for industrial control systems environments where Ethercat communication protocols are utilized. The vulnerability manifests as an out-of-bounds write condition during the processing of specific Ethercat datagrams, representing a critical security flaw that could be exploited by malicious actors to execute arbitrary code on affected systems. The ICSNPP plugin serves as a crucial component in network monitoring and analysis for industrial environments, making this vulnerability particularly concerning for operational technology infrastructure.
The technical flaw stems from improper bounds checking within the Ethercat datagram parsing logic of the Zeek plugin. When processing specially crafted Ethercat frames, the parser fails to validate the length or structure of incoming data before attempting to write to memory buffers. This fundamental programming error creates an opportunity for attackers to craft malicious Ethercat packets that exceed the allocated buffer space, resulting in memory corruption that can be leveraged for code execution. The vulnerability operates at the protocol parsing layer, meaning it can be triggered simply by receiving specific network traffic without requiring authentication or privileged access. This type of vulnerability is classified as CWE-787 Out-of-bounds Write, which represents a well-known class of memory safety issues that can lead to arbitrary code execution and system compromise.
The operational impact of CVE-2023-7243 extends significantly within industrial control system environments where Ethercat communication protocols are prevalent. These systems typically operate in critical infrastructure sectors including manufacturing, energy, water treatment, and other industrial facilities where network monitoring is essential for security operations. An attacker exploiting this vulnerability could gain unauthorized access to industrial control systems, potentially leading to disruption of critical operations, data manipulation, or complete system compromise. The attack surface is particularly broad as Ethercat is widely used in industrial automation networks, making numerous operational technology environments vulnerable to this specific memory corruption issue. The vulnerability's exploitation could result in significant business disruption, safety hazards, and potential financial losses for affected organizations.
Mitigation strategies for CVE-2023-7243 should prioritize immediate patching of the affected ICSNPP Ethercat Zeek plugin to versions that address the out-of-bounds write condition. Organizations should implement network segmentation and monitoring to detect anomalous Ethercat traffic patterns that might indicate exploitation attempts. The principle of least privilege should be applied to network monitoring systems, ensuring that Zeek plugins operate with minimal required permissions. Additionally, implementing intrusion detection systems that can identify malformed Ethercat packets and deploying network access controls to limit Ethercat communication to authorized segments can provide additional defensive layers. Security teams should also consider conducting vulnerability assessments to identify all instances of the affected plugin across their industrial network monitoring infrastructure, as this vulnerability affects the core protocol analysis capabilities that are fundamental to industrial security operations. Organizations should monitor for any potential exploitation attempts and maintain incident response procedures specifically tailored for industrial control system security incidents.