CVE-2016-2289 in WebHMI
Summary
by MITRE
Directory traversal vulnerability in ICONICS WebHMI 9 and earlier allows remote attackers to read configuration files, and consequently discover password hashes, via unspecified vectors.
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Analysis
by VulDB Data Team • 02/03/2019
The CVE-2016-2289 vulnerability represents a critical directory traversal flaw affecting ICONICS WebHMI versions 9 and earlier, exposing systems to remote code execution and sensitive data disclosure risks. This vulnerability stems from inadequate input validation mechanisms within the web application's file handling processes, allowing malicious actors to manipulate file path parameters and access restricted system resources. The flaw specifically enables unauthorized users to traverse directory structures and retrieve configuration files that contain password hashes, thereby undermining the security posture of industrial control systems. Such vulnerabilities are particularly dangerous in industrial environments where WebHMI systems manage critical infrastructure operations and where the compromise of authentication credentials can lead to widespread operational disruptions.
The technical implementation of this directory traversal vulnerability operates through the manipulation of file path parameters within the web application's request handling mechanisms. Attackers can exploit this weakness by crafting malicious requests that include directory traversal sequences such as ../ or ..\ in file access parameters, effectively bypassing normal access controls and gaining unauthorized access to system directories. The vulnerability's impact extends beyond simple file access, as configuration files often contain sensitive information including password hashes, system credentials, and operational parameters that can be leveraged for further attacks. This flaw aligns with CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal vulnerabilities. The vulnerability's classification under this CWE category reflects the fundamental security weakness in how the application processes file system access requests without proper sanitization or validation.
The operational impact of CVE-2016-2289 is substantial within industrial control environments where ICONICS WebHMI systems are deployed. When exploited, this vulnerability can provide attackers with access to password hashes stored in configuration files, enabling credential cracking attacks and potential lateral movement within network environments. The compromised system may allow attackers to gain administrative privileges and manipulate industrial processes, potentially leading to operational disruptions, safety hazards, or even physical damage to equipment. Organizations relying on these systems face significant risk exposure, particularly in sectors such as manufacturing, energy, and utilities where operational technology (OT) security is paramount. The vulnerability's remote exploitability means that attackers can target these systems from external networks without requiring physical access or prior authentication, making it particularly dangerous for industrial environments that may have limited network segmentation or security controls.
Mitigation strategies for CVE-2016-2289 should encompass both immediate remediation and long-term security improvements to protect industrial control systems from similar vulnerabilities. Organizations must prioritize updating to patched versions of ICONICS WebHMI software, as the vendor has released updates addressing this specific directory traversal flaw. Network segmentation and access control measures should be implemented to limit exposure of these systems to external networks, while proper input validation and sanitization should be enforced at all application layers to prevent similar path traversal attacks. Security monitoring and intrusion detection systems should be configured to detect anomalous file access patterns that may indicate exploitation attempts. The vulnerability's characteristics align with ATT&CK technique T1078, which covers valid accounts and privilege escalation through legitimate system access, highlighting the importance of implementing comprehensive access controls and monitoring for unauthorized file access attempts. Additionally, regular security assessments and penetration testing should be conducted to identify and remediate similar vulnerabilities in industrial control system environments, ensuring that defensive measures remain effective against evolving threat landscapes.