CVE-2018-7836 in Monitor
Summary
by MITRE
An unrestricted Upload of File with Dangerous Type vulnerability exists on numerous methods of the IIoT Monitor 3.1.38 software that could allow upload and execution of malicious files.
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Analysis
by VulDB Data Team • 04/24/2020
The CVE-2018-7836 vulnerability represents a critical security flaw in IIoT Monitor 3.1.38 software that exposes organizations to significant operational risks through unrestricted file upload capabilities. This vulnerability falls under the category of unrestricted file upload attacks, which are classified as CWE-434 within the Common Weakness Enumeration framework. The flaw exists across multiple methods within the industrial internet of things monitoring platform, creating widespread exposure points that adversaries can exploit to gain unauthorized access to critical infrastructure systems. The vulnerability specifically allows attackers to upload and execute malicious files without proper validation or sanitization of file types, creating a direct pathway for code execution and system compromise.
The technical implementation of this vulnerability stems from inadequate input validation mechanisms within the IIoT Monitor software's file handling processes. When users or automated processes attempt to upload files through various application interfaces, the system fails to properly verify file extensions, content types, or file signatures before storing and processing uploaded content. This lack of proper file type validation creates a dangerous attack surface where malicious actors can upload executable files, scripts, or other harmful content that can be executed within the context of the application's privileges. The vulnerability is particularly concerning in industrial environments where IIoT systems control critical infrastructure operations, as successful exploitation can lead to complete system compromise and operational disruption.
The operational impact of CVE-2018-7836 extends beyond simple unauthorized file execution to encompass broader security implications for industrial control systems and operational technology environments. Organizations utilizing IIoT Monitor 3.1.38 may face potential data breaches, system downtime, and operational disruption when attackers exploit this vulnerability to deploy malware, backdoors, or other malicious payloads. The attack surface is further expanded due to the software's deployment in industrial settings where network segmentation may be limited, allowing lateral movement and escalation of privileges. This vulnerability directly aligns with several tactics identified in the MITRE ATT&CK framework, particularly those related to initial access through malicious file execution and privilege escalation via compromised system components.
Mitigation strategies for CVE-2018-7836 should focus on implementing comprehensive file upload validation mechanisms and restricting upload capabilities to authenticated users only. Organizations should deploy strict file type filtering based on whitelisting rather than blacklisting approaches, ensuring that only known safe file extensions are accepted. The implementation of proper content validation techniques including MIME type checking and file signature verification can significantly reduce exploitation risk. Network segmentation and access controls should be strengthened to limit upload capabilities to authorized personnel only, while regular security assessments and penetration testing can help identify additional vulnerabilities within the IIoT ecosystem. Additionally, organizations should consider implementing web application firewalls and intrusion detection systems to monitor for suspicious file upload activities and prevent exploitation attempts.