CVE-2019-7256 in Linear eMerge E3
Summary
by MITRE
Linear eMerge E3-Series devices allow Command Injections.
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Analysis
by VulDB Data Team • 02/06/2025
The Linear eMerge E3-Series represents a line of industrial control and monitoring devices commonly deployed in commercial and industrial environments for security and automation purposes. These devices are designed to integrate with various building management systems and security infrastructure, making them critical components in enterprise environments where operational technology and information technology converge. The vulnerability identified as CVE-2019-7256 affects the command execution mechanisms within these devices, creating a significant security risk that could be exploited by malicious actors to gain unauthorized access to the underlying systems. This particular flaw manifests as a command injection vulnerability, which falls under the Common Weakness Enumeration category CWE-77, specifically targeting improper neutralization of special elements used in commands.
The technical implementation of this vulnerability occurs within the device's input validation and command processing functions, where user-supplied data is not properly sanitized before being incorporated into system commands. Attackers can exploit this weakness by crafting malicious inputs that, when processed by the device, result in unintended command execution. This type of vulnerability typically occurs when the device fails to properly validate or escape input parameters that are subsequently used in system calls or shell commands. The attack vector is particularly concerning because it allows for arbitrary code execution on the target device, potentially enabling attackers to escalate privileges, modify system configurations, or even take complete control of the device's operational functions. The vulnerability's impact is amplified by the critical role these devices play in industrial control systems, where unauthorized access could lead to operational disruptions or safety hazards.
The operational implications of this vulnerability extend beyond simple unauthorized access, as it represents a fundamental breakdown in the device's security architecture. When exploited, this command injection vulnerability could allow attackers to execute arbitrary commands with the privileges of the affected service account, potentially leading to complete system compromise. In industrial environments, this could result in unauthorized modification of security protocols, disruption of critical operations, or even physical safety risks if the compromised devices control access systems, lighting, or environmental controls. The vulnerability's presence in devices used for building management and security infrastructure creates a pathway for attackers to move laterally within networks, potentially accessing additional systems and data. This aligns with the attack pattern described in the MITRE ATT&CK framework under the technique of Command and Scripting Interpreter, where adversaries leverage system command interfaces to execute malicious code.
Organizations utilizing Linear eMerge E3-Series devices should implement immediate mitigation strategies to address this vulnerability. The primary recommendation involves applying vendor-provided security patches or firmware updates that address the command injection flaw. Network segmentation and access control measures should be implemented to limit exposure of these devices to untrusted networks and users. Additionally, implementing input validation controls and monitoring for unusual command execution patterns can help detect potential exploitation attempts. The vulnerability highlights the importance of secure coding practices and proper input sanitization in industrial control systems, as outlined in various security standards including NIST SP 800-82 for industrial control systems security. Regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in other industrial devices within the network infrastructure.