CVE-2016-0854 in WebAccess
Summary
by MITRE
Unrestricted file upload vulnerability in Advantech WebAccess before 8.1 allows remote attackers to write to files of arbitrary types via unspecified vectors.
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Analysis
by VulDB Data Team • 05/24/2025
The CVE-2016-0854 vulnerability represents a critical unrestricted file upload flaw in Advantech WebAccess versions prior to 8.1, constituting a significant security weakness that enables remote attackers to execute arbitrary file operations on affected systems. This vulnerability falls under the category of insecure file handling practices and specifically aligns with CWE-434, which addresses unrestricted file upload vulnerabilities where applications fail to properly validate or restrict file types that users can upload. The flaw permits attackers to bypass normal file validation mechanisms and potentially upload malicious files such as web shells, executables, or scripts that could compromise the entire system.
The technical exploitation of this vulnerability occurs through unspecified vectors within the WebAccess platform, which likely involves web interfaces or administrative portals where file upload functionality is exposed to remote users. Attackers can leverage this weakness to upload files of arbitrary types, potentially including malicious code that executes within the context of the web server or application. The impact extends beyond simple file persistence, as successful exploitation could lead to complete system compromise through privilege escalation, remote code execution, or data exfiltration. The vulnerability is particularly dangerous in industrial control systems environments where Advantech WebAccess is commonly deployed, as these systems often handle critical infrastructure operations.
The operational impact of CVE-2016-0854 is severe and multifaceted, particularly in environments where industrial automation and control systems are managed through WebAccess platforms. Organizations operating in sectors such as manufacturing, energy, and utilities face significant risk of operational disruption, data breaches, and potential safety hazards when this vulnerability is exploited. The remote nature of the attack means that adversaries do not require physical access to the system or local network presence, making detection and prevention more challenging. This vulnerability directly relates to several tactics in the MITRE ATT&CK framework, specifically covering T1190 for Exploit Public-Facing Application and T1059 for Command and Scripting Interpreter, as attackers can leverage the upload capability to establish persistent access and execute malicious commands.
Organizations should implement immediate mitigations including upgrading to Advantech WebAccess 8.1 or later versions where the vulnerability has been patched, implementing strict file type validation and content verification mechanisms, and restricting upload functionality to authenticated users only. Network segmentation and monitoring should be enhanced to detect suspicious file upload activities, while regular security assessments should be conducted to identify similar vulnerabilities in industrial control system components. The vulnerability demonstrates the critical importance of proper input validation and the principle of least privilege in industrial environments where system integrity and operational security are paramount.