CVE-2016-4532 in Directory
Summary
by MITRE
Directory traversal vulnerability in the WAP interface in Trihedral VTScada (formerly VTS) 8.x through 11.x before 11.2.02 allows remote attackers to read arbitrary files via a crafted pathname.
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Analysis
by VulDB Data Team • 01/14/2019
The vulnerability CVE-2016-4532 represents a critical directory traversal flaw within the Wireless Application Protocol interface of Trihedral VTScada software versions 8.x through 11.x prior to 11.2.02. This weakness exposes the system to remote exploitation where malicious actors can manipulate file path references to access unauthorized system files. The WAP interface serves as a communication channel for remote monitoring and control of industrial control systems, making this vulnerability particularly dangerous in operational technology environments. The flaw stems from inadequate input validation and path sanitization mechanisms within the software's file handling routines, allowing attackers to craft malicious pathname requests that bypass normal access controls.
This directory traversal vulnerability operates by exploiting insufficient validation of user-supplied input in the WAP interface components. When the system processes file requests through the wireless protocol interface, it fails to properly sanitize or validate the pathname parameters, enabling attackers to use sequences like "../" to navigate outside the intended directory structures. The vulnerability is classified under CWE-22 as Improper Limitation of a Pathname to a Restricted Directory, which is a well-documented weakness in software security that has been consistently identified in industrial control systems. Attackers can leverage this flaw to access sensitive configuration files, system logs, credentials, and potentially proprietary industrial protocols that should remain restricted to authorized personnel.
The operational impact of this vulnerability extends beyond simple information disclosure, as it creates a significant attack surface for industrial control system environments. In industrial settings where VTScada systems manage critical infrastructure, this vulnerability could enable attackers to gain unauthorized access to operational data, potentially leading to system compromise or disruption of critical processes. The remote nature of the attack means that threat actors do not require physical access to the system, making it particularly concerning for environments where physical security measures may be inadequate. The vulnerability affects multiple versions of the software, indicating a persistent flaw in the codebase that required multiple releases to address properly.
Mitigation strategies for CVE-2016-4532 should focus on immediate patch deployment to version 11.2.02 or later, which contains the necessary fixes for the directory traversal vulnerability. Organizations should also implement network segmentation to isolate industrial control systems from general network access, reducing the attack surface available to remote attackers. Input validation should be strengthened throughout the application to ensure all pathname parameters are properly sanitized before processing, following established security practices such as those outlined in the OWASP Top Ten. Additionally, monitoring and logging of file access patterns can help detect potential exploitation attempts, while regular security assessments of industrial control systems should be conducted to identify similar vulnerabilities in other components of the operational technology infrastructure. The vulnerability demonstrates the importance of maintaining up-to-date security patches in industrial environments, as highlighted in various ATT&CK framework techniques related to privilege escalation and credential access through software vulnerabilities.