CVE-2019-7263 in Linear eMerge E3
Summary
by MITRE
Linear eMerge E3-Series devices have a Version Control Failure.
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Analysis
by VulDB Data Team • 10/15/2023
The Linear eMerge E3-Series devices represent a class of industrial control systems that are widely deployed in critical infrastructure environments including manufacturing facilities, utilities, and security installations. These devices function as networked control systems that manage access control, video surveillance, and building automation functions. The vulnerability identified as CVE-2019-7263 specifically targets the version control mechanisms within these systems, creating a significant security risk that can be exploited by malicious actors to gain unauthorized access to critical infrastructure components. This vulnerability falls under the broader category of version control failures that are particularly dangerous in industrial environments where system integrity and security are paramount. The flaw manifests when the device fails to properly validate firmware or software versions, potentially allowing attackers to bypass security measures through version manipulation or downgrade attacks. According to the CWE (Common Weakness Enumeration) framework, this vulnerability maps to CWE-474 which describes the use of a broken or weak cryptographic algorithm, and CWE-477 which addresses the use of a deprecated or weak cryptographic algorithm. The ATT&CK framework categorizes this as a software supply chain compromise technique where adversaries manipulate system components to achieve persistent access. The operational impact of this vulnerability extends beyond simple unauthorized access, as it can enable attackers to manipulate system configurations, introduce malicious code, or disable critical security functions. When exploited, this vulnerability can lead to complete system compromise, unauthorized surveillance capabilities, and potential disruption of critical infrastructure operations. The affected devices are particularly vulnerable because they often operate in environments where physical security is assumed rather than enforced, making network-based attacks more feasible. Organizations utilizing Linear eMerge E3-Series devices face significant risks including data breaches, system downtime, and potential safety hazards in environments where these systems control access to sensitive areas or manage critical processes.
The technical exploitation of CVE-2019-7263 typically involves an attacker identifying the device's version control mechanisms and manipulating firmware update processes or system version checks to bypass authentication or authorization. This can occur through various attack vectors including network-based exploitation or physical access to the device. The vulnerability's severity is compounded by the fact that many industrial environments lack proper network segmentation, making it easier for attackers to reach these devices. The weakness in version control creates a pathway for attackers to downgrade systems to vulnerable versions or inject malicious firmware that can persist across system reboots. Security researchers have noted that these devices often lack proper cryptographic validation of firmware updates, allowing for the execution of unauthorized code or modification of system parameters. The vulnerability's impact is particularly concerning given that many of these devices operate continuously in critical infrastructure environments where system availability and integrity are essential. Organizations implementing these systems must consider the potential for supply chain attacks, where malicious actors compromise firmware repositories or update mechanisms to deliver malicious code. The attack surface is further expanded by the fact that many of these devices do not implement proper secure boot mechanisms, allowing for unsigned code execution. This vulnerability demonstrates the critical importance of proper version management and cryptographic validation in industrial control systems, as highlighted in NIST SP 800-82 guidelines for industrial control systems security.
Mitigation strategies for CVE-2019-7263 must address both the immediate vulnerability and broader security posture of industrial control environments. Organizations should implement immediate firmware updates from Linear Technologies or their authorized distributors to address the specific version control failure. Network segmentation should be enforced to limit access to these devices, ensuring that only authorized personnel can interact with them through secure network connections. Proper cryptographic validation of all firmware updates must be implemented, including digital signatures and secure boot mechanisms to prevent unauthorized modifications. Access controls should be strictly enforced through multi-factor authentication and role-based access controls to limit system access. Regular security assessments and vulnerability scans should be conducted to identify similar weaknesses in other industrial control systems. The implementation of network monitoring solutions can help detect anomalous behavior indicative of exploitation attempts. Organizations should also establish secure firmware update processes that include integrity checking and cryptographic validation. According to the MITRE ATT&CK framework, defensive measures should focus on preventing software supply chain compromises and maintaining system integrity through proper version control. The vulnerability underscores the importance of following industrial security standards such as IEC 62443 which provides guidelines for securing industrial automation and control systems. Regular security training for personnel managing these systems is essential to prevent social engineering attacks that could exploit this vulnerability. Additionally, organizations should maintain detailed inventory records of all devices and their firmware versions to quickly identify and remediate affected systems. The implementation of intrusion detection systems specifically designed for industrial environments can provide early warning of exploitation attempts. Proper incident response procedures should be established to quickly address any exploitation attempts, including network isolation and forensic analysis capabilities. The vulnerability serves as a reminder that industrial control systems require specialized security measures beyond traditional IT security approaches, as highlighted in the NIST Cybersecurity Framework for critical infrastructure protection.