CVE-2022-2791 in Proficy Machine Edition
Summary
by MITRE • 11/22/2022
Emerson Electric's Proficy Machine Edition Version 9.00 and prior is vulnerable to CWE-434 Unrestricted Upload of File with Dangerous Type, and will upload any file written into the PLC logic folder to the connected PLC.
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Analysis
by VulDB Data Team • 12/22/2022
The vulnerability identified as CVE-2022-2791 affects Emerson Electric's Proficy Machine Edition software version 9.00 and earlier, representing a critical security flaw that enables unauthorized file uploads to connected programmable logic controllers. This issue stems from CWE-434, which specifically addresses unrestricted file upload vulnerabilities where the system fails to properly validate file types during the upload process. The vulnerability allows attackers to upload malicious files directly into the PLC logic folder, potentially compromising the industrial control systems that rely on these devices for critical operations.
The technical implementation of this vulnerability occurs within the software's file handling mechanisms where there are insufficient validation controls to prevent the upload of dangerous file types. When users or attackers upload files through the Proficy Machine Edition interface, the system does not adequately verify the file extensions, content, or file types being transferred to the PLC logic folder. This lack of proper validation creates an environment where any file can be uploaded regardless of its potential threat level, including executable files, scripts, or other malicious payloads that could compromise the PLC's operational integrity.
The operational impact of this vulnerability extends beyond simple unauthorized access to potentially catastrophic consequences for industrial operations. When malicious files are uploaded to the PLC logic folder, they can execute code within the PLC environment, potentially leading to system compromise, unauthorized control of industrial processes, or disruption of critical manufacturing operations. The vulnerability particularly affects environments where PLCs control physical processes such as manufacturing equipment, power generation systems, or other industrial control systems where the consequences of unauthorized code execution could result in significant financial loss, safety hazards, or operational downtime.
Security professionals should consider this vulnerability in the context of the broader ATT&CK framework, specifically under the T1190 - Exploit Public-Facing Application and T1059 - Command and Scripting Interpreter tactics. The vulnerability creates a direct pathway for attackers to establish persistence within industrial control environments through the upload of malicious payloads that can execute within the PLC logic folder. Organizations should implement immediate mitigations including network segmentation to isolate PLC environments, implementing strict file type validation controls, and restricting administrative access to the Proficy Machine Edition software to reduce the attack surface. Additionally, regular security assessments and monitoring of file upload activities within industrial control systems should be implemented to detect and prevent unauthorized file transfers that could exploit this vulnerability.