CVE-2020-27287 in CNCSoft-B
Summary
by MITRE • 01/12/2021
Delta Electronics CNCSoft-B Versions 1.0.0.2 and prior is vulnerable to an out-of-bounds write while processing project files, which may allow an attacker to execute arbitrary code.
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Analysis
by VulDB Data Team • 02/11/2021
Delta Electronics CNCSoft-B version 1.0.0.2 and earlier contains a critical out-of-bounds write vulnerability that arises during the processing of project files, representing a significant security risk for industrial control systems. This vulnerability falls under the common weakness enumeration CWE-787, which specifically addresses out-of-bounds write conditions that can lead to arbitrary code execution. The flaw occurs when the software attempts to write data beyond the allocated memory boundaries while parsing project files, creating an opportunity for malicious actors to manipulate the application's memory structure.
The technical implementation of this vulnerability stems from inadequate bounds checking within the project file parsing routine. When CNCSoft-B processes project files containing malformed or specially crafted data, the application fails to validate array indices or buffer limits before writing to memory locations. This allows an attacker to craft a malicious project file that triggers the out-of-bounds write condition, potentially overwriting adjacent memory regions including function pointers, return addresses, or other critical program data structures. The vulnerability is particularly concerning in industrial environments where CNC machines and manufacturing systems rely on such software for operation.
The operational impact of this vulnerability extends beyond simple code execution, as it represents a potential pathway for attackers to gain persistent control over industrial control systems. In the context of the attack tactics and techniques framework, this vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter and T1068 for exploit for privilege escalation. The successful exploitation could enable attackers to install backdoors, modify production processes, or cause physical damage to manufacturing equipment. Given that CNC machines often operate in closed-loop systems with direct control over machinery, the potential for operational technology disruption is substantial.
Mitigation strategies for this vulnerability should include immediate patching of CNCSoft-B to version 1.0.0.3 or later, which contains the necessary bounds checking fixes. Organizations should implement network segmentation to limit access to CNC systems and employ strict file validation procedures for all project files. Additionally, regular security assessments of industrial control systems should be conducted to identify similar vulnerabilities in other proprietary software components. The vulnerability also highlights the importance of secure coding practices in industrial software development and the need for regular security reviews of critical infrastructure applications.