CVE-2022-44456 in CONPROSYS HMI System
Summary
by MITRE • 12/19/2022
CONPROSYS HMI System (CHS) Ver.3.4.4?and earlier allows a remote unauthenticated attacker to execute an arbitrary OS command on the server where the product is running by sending a specially crafted request.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 01/07/2023
The vulnerability identified as CVE-2022-44456 affects the CONPROSYS HMI System version 3.4.4 and earlier, representing a critical remote code execution flaw that exposes industrial control systems to unauthorized manipulation. This vulnerability resides within the web interface of the system, specifically in how it processes incoming HTTP requests, creating an attack vector that requires no authentication credentials for exploitation. The flaw enables an attacker to inject and execute arbitrary operating system commands on the target server, fundamentally compromising the system's integrity and operational security. Such vulnerabilities are particularly dangerous in industrial environments where HMI systems serve as critical interfaces between human operators and industrial processes, making them prime targets for sophisticated cyber attacks.
The technical implementation of this vulnerability stems from improper input validation within the web application layer of the CHS system, which fails to adequately sanitize user-supplied data before processing it as part of command execution sequences. When a malicious actor sends a specially crafted HTTP request containing command injection payloads, the system blindly executes these commands with the privileges of the web application service account, typically running with elevated system permissions. This lack of proper input sanitization directly maps to CWE-77, or "Command Injection," a well-documented weakness that has been consistently exploited across various industrial control systems and web applications. The vulnerability's remote nature eliminates the need for physical access or network proximity, making it particularly attractive to threat actors seeking to compromise operational technology environments.
The operational impact of CVE-2022-44456 extends beyond simple unauthorized access, as it provides attackers with complete control over the affected HMI system and potentially the underlying industrial processes it manages. An attacker could manipulate process controls, alter operational parameters, or even cause system failures that could result in production downtime, safety hazards, or environmental damage. The vulnerability's ability to execute arbitrary OS commands means that attackers can install backdoors, exfiltrate sensitive operational data, or deploy additional malware within the industrial network. This type of compromise directly aligns with tactics described in the MITRE ATT&CK framework under the T1059.001 technique for "Command and Scripting Interpreter," where adversaries use legitimate system utilities to execute malicious commands. The implications are particularly severe in critical infrastructure sectors such as manufacturing, energy, and water treatment facilities where HMI systems control essential processes.
Mitigation strategies for CVE-2022-44456 should prioritize immediate remediation through official firmware updates provided by CONPROSYS, as the vendor has likely released patches addressing this specific vulnerability. Organizations should implement network segmentation to isolate affected HMI systems from critical operational networks, reducing the potential blast radius of successful attacks. Access controls must be strengthened through the implementation of multi-factor authentication and role-based access controls, even though the vulnerability allows unauthenticated exploitation. Network monitoring solutions should be deployed to detect anomalous command execution patterns and unusual network traffic originating from HMI systems. Security teams should conduct thorough vulnerability assessments of their industrial control systems to identify similar weaknesses that may not have been publicly disclosed. Additionally, implementing web application firewalls and input validation rules can provide additional layers of protection against similar command injection attacks, while regular security audits and penetration testing help ensure that defensive measures remain effective against evolving threat landscapes.