CVE-2018-14806 in WebAccess
Summary
by MITRE
Advantech WebAccess 8.3.1 and earlier has a path traversal vulnerability which may allow an attacker to execute arbitrary code.
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Analysis
by VulDB Data Team • 05/30/2023
The vulnerability identified as CVE-2018-14806 affects Advantech WebAccess versions 8.3.1 and earlier, representing a critical path traversal flaw that exposes systems to arbitrary code execution. This vulnerability resides within the web-based management interface of the Advantech WebAccess industrial automation platform, which is widely deployed in industrial control systems and supervisory control and data acquisition environments. The flaw stems from inadequate input validation and improper path resolution mechanisms within the application's file handling functions, creating an exploitable condition that allows remote attackers to navigate the file system beyond intended boundaries.
The technical implementation of this vulnerability involves the exploitation of insufficient sanitization of user-supplied input parameters that are processed by the WebAccess application. When the system processes file requests through its web interface, it fails to properly validate or sanitize file path parameters, enabling attackers to manipulate these inputs using directory traversal sequences such as "../" or similar constructs. This weakness is classified under CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The vulnerability allows an attacker to access files and directories outside the intended scope, potentially leading to unauthorized data access, system compromise, or complete system takeover.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with the capability to gain unauthorized access to sensitive industrial control system data and potentially manipulate critical infrastructure operations. In industrial environments where Advantech WebAccess is deployed, this vulnerability could enable attackers to access configuration files containing credentials, system logs, or operational data that could be used for further attacks or to disrupt critical processes. The attack surface is particularly concerning given that many industrial environments lack the robust network segmentation and monitoring controls found in traditional enterprise environments, making successful exploitation more likely to result in significant operational disruption or security breaches.
Mitigation strategies for CVE-2018-14806 should prioritize immediate patching of affected systems to the latest available versions of Advantech WebAccess that address the path traversal vulnerability. Organizations should implement network segmentation to limit access to the WebAccess management interface to authorized personnel only, while also deploying intrusion detection systems to monitor for suspicious file access patterns. The implementation of web application firewalls and input validation controls can provide additional layers of protection, though these should not be considered substitutes for proper patch management. Security monitoring should include regular audit of file access logs and implementation of automated vulnerability scanning tools to identify any remaining unpatched systems within the industrial control environment. According to ATT&CK framework, this vulnerability maps to techniques involving path traversal and privilege escalation, with potential lateral movement opportunities for attackers who successfully exploit the flaw, making comprehensive network monitoring and access control implementation essential components of the overall defense strategy.