CVE-2020-16201 in CNCSoft ScreenEditor
Summary
by MITRE
Delta Industrial Automation CNCSoft ScreenEditor, Versions 1.01.23 and prior. Multiple out-of-bounds read vulnerabilities may be exploited by processing specially crafted project files, which may allow an attacker to read information.
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Analysis
by VulDB Data Team • 08/05/2020
Delta Industrial Automation CNCSoft ScreenEditor version 1.01.23 and earlier contains multiple out-of-bounds read vulnerabilities that arise when processing specially crafted project files. These vulnerabilities fall under the Common Weakness Enumeration category CWE-129, which addresses insufficient validation of array indices or other forms of input validation that can lead to out-of-bounds memory access. The flaw occurs during the parsing of project files where the software fails to properly validate the size or boundaries of data structures before attempting to read from memory locations that may not be properly allocated or accessible. This type of vulnerability represents a critical security risk in industrial control systems where unauthorized access to memory contents could potentially reveal sensitive information about the system configuration, internal data structures, or even proprietary manufacturing processes. The out-of-bounds read conditions can be triggered through manipulation of input files, making this a file-based vulnerability that aligns with ATT&CK technique T1059.001 for execution through file processing. When exploited, these vulnerabilities could allow attackers to extract information from memory that should remain confidential, potentially exposing system internals or even sensitive operational data that could be leveraged for further attacks within the industrial environment. The impact extends beyond simple information disclosure as it represents a foundational weakness in the software's input handling mechanisms. The vulnerability is particularly concerning in industrial automation contexts where CNC systems are often connected to critical manufacturing processes and may be exposed to untrusted inputs from various sources including network connections or file transfers. The memory access patterns that trigger these out-of-bounds reads could potentially be chained with other vulnerabilities or used as a stepping stone for more sophisticated attacks within the industrial control system architecture. Organizations using Delta CNCSoft ScreenEditor should immediately implement patch management procedures to update to versions that address these memory access validation issues. Additionally, input validation controls should be enhanced to include proper boundary checks on all file processing operations, and access controls should be implemented to restrict file upload capabilities to trusted sources only. The vulnerability demonstrates the importance of robust input validation in industrial control system software, as these systems often operate in environments where security controls may be less stringent than in traditional enterprise environments. Security monitoring should include detection of unusual file processing patterns and memory access attempts that could indicate exploitation attempts against these types of vulnerabilities. The risk assessment should consider not only the immediate information disclosure but also the potential for escalation through information gathering that could aid in targeting other system components within the industrial network infrastructure.