CVE-2020-27291 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 read 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 versions 1.0.0.2 and earlier contain a critical out-of-bounds read vulnerability that arises during project file processing operations. This flaw represents a classic buffer overread condition where the application fails to properly validate array indices when parsing project files, potentially allowing an attacker to access memory locations beyond the allocated buffer boundaries. The vulnerability stems from insufficient input validation mechanisms within the file parsing routine, creating an opportunity for malicious actors to craft specially formatted project files that trigger the out-of-bounds memory access.
The technical exploitation of this vulnerability occurs when the CNCSoft-B application processes malformed project files containing crafted data structures that exceed expected buffer limits. This out-of-bounds read can lead to information disclosure, application instability, or more severe consequences including arbitrary code execution. The flaw falls under the CWE-125 weakness category, which specifically addresses out-of-bounds read conditions in software applications. When an attacker successfully triggers this vulnerability, they can potentially manipulate the program flow by reading sensitive data from adjacent memory locations or by causing the application to jump to unintended execution paths.
From an operational perspective, this vulnerability poses significant risks to manufacturing environments that rely on Delta Electronics CNC systems for production processes. The ability to execute arbitrary code remotely through project file manipulation could enable attackers to compromise entire production lines, potentially causing physical damage to machinery or disrupting critical manufacturing operations. The attack surface is particularly concerning given that project files are commonly shared between operators and engineers, making it relatively easy for malicious actors to deliver payloads through seemingly legitimate file transfers. This vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as successful exploitation could enable persistent access and command execution within the target environment.
Mitigation strategies should focus on immediate patch deployment for all affected CNCSoft-B installations, as well as implementing strict file validation procedures for project files entering the system. Organizations should establish robust input sanitization measures and consider implementing network segmentation to limit access to critical CNC systems. Additionally, regular security assessments of industrial control systems should include thorough review of file processing routines and memory management practices. The vulnerability demonstrates the importance of secure coding practices in industrial software environments where reliability and security are paramount, particularly in scenarios where software failures could result in physical harm or significant economic disruption.