CVE-2020-7002 in CNCSoft ScreenEditor
Summary
by MITRE
Delta Industrial Automation CNCSoft ScreenEditor, v1.00.96 and prior. Multiple stack-based buffer overflows can be exploited when a valid user opens a specially crafted, malicious input file.
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Analysis
by VulDB Data Team • 05/10/2025
The vulnerability identified as CVE-2020-7002 affects Delta Industrial Automation CNCSoft ScreenEditor version 1.00.96 and earlier, representing a critical security flaw that exposes industrial control systems to potential exploitation. This software serves as a graphical interface for configuring and managing industrial automation systems, making it a prime target for attackers seeking to compromise industrial environments. The vulnerability manifests through multiple stack-based buffer overflows that occur when legitimate users open specially crafted malicious input files, creating a scenario where authorized personnel become unwitting vectors for attack. The implications extend beyond simple privilege escalation as these buffer overflows can lead to arbitrary code execution within the context of the running application, potentially allowing attackers to gain full control over the industrial automation system.
The technical nature of this vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which occurs when data written to a stack buffer exceeds the buffer's allocated size, causing adjacent memory to be overwritten. In the context of industrial automation software, this flaw represents a particularly dangerous attack surface because the affected application processes user-supplied data without proper bounds checking. The buffer overflow conditions are triggered during the parsing of input files, where the ScreenEditor fails to validate the size or structure of incoming data before attempting to store it in fixed-size stack buffers. This design flaw allows attackers to craft malicious input files that contain oversized data sequences, causing the program to overwrite critical memory locations including return addresses and function pointers, thereby enabling arbitrary code execution.
The operational impact of CVE-2020-7002 extends far beyond traditional cybersecurity concerns, as it directly threatens the integrity and availability of industrial control systems that are fundamental to manufacturing and production environments. When exploited, this vulnerability can allow attackers to execute malicious code with the privileges of the ScreenEditor application, potentially leading to complete system compromise of industrial automation infrastructure. The attack vector is particularly concerning because it requires only that a legitimate user open a malicious file, making it difficult to detect and prevent through traditional network-based security measures. Industrial environments often lack the sophisticated endpoint protection found in enterprise networks, making these systems more vulnerable to such attacks that exploit application-level flaws in specialized industrial software.
Organizations utilizing Delta Industrial Automation CNCSoft ScreenEditor should implement immediate mitigations to protect their industrial control systems from exploitation of this vulnerability. The primary recommendation involves upgrading to the latest version of the software that contains patches addressing the buffer overflow conditions. Additionally, implementing strict file validation procedures and restricting user access to input file processing can significantly reduce the attack surface. Network segmentation and monitoring of industrial control system communications can help detect anomalous behavior that might indicate exploitation attempts. The vulnerability's characteristics align with tactics described in the ATT&CK framework under Initial Access and Execution phases, where attackers leverage legitimate software to establish footholds within industrial environments. Security teams should also consider implementing application whitelisting policies that restrict execution of unauthorized software and establish robust incident response procedures specifically tailored to industrial control system environments. Regular security assessments and vulnerability management programs should include specialized industrial automation software to prevent similar vulnerabilities from remaining unpatched in operational technology environments.