CVE-2020-18753 in PLC MAC1100
Summary
by MITRE • 08/14/2021
An issue in Dut Computer Control Engineering Co.'s PLC MAC1100 allows attackers to gain access to the system and escalate privileges via a crafted packet.
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Analysis
by VulDB Data Team • 08/18/2021
The CVE-2020-18753 vulnerability represents a critical security flaw in the PLC MAC1100 device manufactured by Dut Computer Control Engineering Co. This industrial control system component operates within critical infrastructure environments where unauthorized access can have severe operational and safety implications. The vulnerability manifests through a specific packet crafting mechanism that enables attackers to bypass authentication controls and escalate their privileges within the system. The affected device likely operates in environments such as manufacturing plants, power generation facilities, or other industrial settings where PLCs control critical processes and equipment operations.
The technical implementation of this vulnerability stems from inadequate input validation and privilege escalation mechanisms within the PLC's communication protocols. Attackers can craft specially designed network packets that exploit weaknesses in the device's authentication framework, potentially allowing them to execute arbitrary code or gain administrative access to the system. This type of vulnerability falls under CWE-264, which addresses permissions, privileges, and access controls in software systems. The flaw likely exists in how the device processes incoming network communications, particularly in its handling of authentication tokens or session management protocols that are essential for maintaining system integrity and security boundaries.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it can enable attackers to manipulate industrial processes and potentially cause significant disruptions to critical infrastructure operations. An attacker who successfully exploits this vulnerability could modify control parameters, alter process variables, or even cause physical damage to equipment through malicious control commands. The implications are particularly severe in environments where PLCs control hazardous materials, nuclear reactors, or other systems where process control failures could result in environmental damage, safety hazards, or loss of life. The attack vector through crafted packets suggests this vulnerability could be exploited remotely, potentially allowing attackers to compromise systems from external networks without physical access to the industrial facility.
Mitigation strategies for CVE-2020-18753 should focus on immediate network segmentation and access control measures to limit exposure of affected PLCs to untrusted networks. Organizations should implement network monitoring solutions to detect anomalous packet patterns that might indicate exploitation attempts, while also ensuring that all PLC firmware is updated with vendor-provided patches. The vulnerability demonstrates the importance of secure network design principles and adherence to industrial cybersecurity standards such as those outlined in the NIST Cybersecurity Framework for Industrial Control Systems. Security teams should also consider implementing intrusion detection systems specifically designed for industrial environments and establish strict network access controls to prevent lateral movement within industrial control networks. This vulnerability exemplifies the broader challenge of securing industrial control systems where traditional cybersecurity approaches may not adequately address the unique operational requirements and threat landscape of critical infrastructure environments.