CVE-2019-7267 in Linear eMerge 50P
Summary
by MITRE
Linear eMerge 50P/5000P devices allow Cookie Path Traversal.
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Analysis
by VulDB Data Team • 10/15/2023
The vulnerability identified as CVE-2019-7267 affects Linear eMerge 50P and 5000P network security devices, representing a critical path traversal flaw in the cookie handling mechanism of these industrial security appliances. These devices are designed for network access control and security management within industrial environments, making them potential targets for sophisticated cyber attacks that could compromise critical infrastructure. The vulnerability specifically resides in how the devices process cookie path attributes, allowing unauthorized access to sensitive system resources through manipulated cookie values.
This security flaw enables attackers to exploit the cookie path traversal mechanism by crafting malicious cookie values that bypass normal access controls and path validation checks. The vulnerability stems from insufficient input validation and improper sanitization of cookie path parameters, which allows attackers to manipulate the path resolution logic within the device's web interface. The issue manifests when the device fails to properly validate or sanitize the path component of cookies, potentially allowing an attacker to traverse directories and access restricted system files or administrative interfaces. Such path traversal vulnerabilities are classified under CWE-22 as "Path Traversal" and can be leveraged for privilege escalation and unauthorized data access.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with the capability to access administrative functions and potentially execute arbitrary code within the device's operating environment. Industrial control systems running these devices may face significant operational disruption if an attacker successfully exploits this vulnerability to gain unauthorized access to network security controls. The attack surface is particularly concerning for critical infrastructure environments where these devices are deployed, as they often control access to sensitive industrial networks and may be used to protect against lateral movement attacks. The vulnerability can be exploited through web-based attacks targeting the device's management interface, potentially leading to complete compromise of the security appliance and subsequent access to protected industrial networks.
Mitigation strategies for CVE-2019-7267 should focus on immediate firmware updates from Linear Technologies, which would address the cookie path validation logic and implement proper input sanitization measures. Network administrators should also implement additional security controls such as restricting access to the device management interfaces through network segmentation and implementing strict firewall rules that limit access to only trusted administrative workstations. The vulnerability aligns with ATT&CK technique T1190 "Exploit Public-Facing Application" and may also map to T1078 "Valid Accounts" if attackers can escalate privileges through the compromised device. Organizations should conduct thorough network assessments to identify all instances of these devices and implement monitoring for suspicious cookie usage patterns. Additionally, implementing web application firewalls and security monitoring solutions that can detect and block malformed cookie path requests will provide additional defense-in-depth measures against this specific vulnerability.