CVE-2016-0856 in WebAccess
Summary
by MITRE
Multiple stack-based buffer overflows in Advantech WebAccess before 8.1 allow remote attackers to execute arbitrary code via unspecified vectors.
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Analysis
by VulDB Data Team • 07/23/2018
The vulnerability identified as CVE-2016-0856 represents a critical stack-based buffer overflow flaw discovered in Advantech WebAccess software versions prior to 8.1. This vulnerability resides within the industrial automation and monitoring platform that is widely deployed in critical infrastructure environments. The flaw allows remote attackers to exploit the system without requiring authentication, making it particularly dangerous in operational technology environments where security is paramount. The vulnerability affects the software's handling of input data within stack memory structures, creating opportunities for malicious code execution that could compromise entire industrial control systems.
The technical implementation of this buffer overflow occurs when the Advantech WebAccess software processes incoming data streams that exceed the allocated stack buffer size. This condition creates a situation where adjacent memory locations become overwritten with attacker-controlled data, potentially allowing for the execution of arbitrary code with the privileges of the affected process. The vulnerability manifests through unspecified vectors, indicating that multiple attack surfaces within the software could be exploited, including network protocols, web interfaces, or data processing modules. This lack of specificity in attack vectors suggests a fundamental flaw in input validation and memory management practices within the software architecture.
From an operational perspective, the impact of this vulnerability extends beyond simple code execution to potentially compromise entire industrial control systems. The ability to execute arbitrary code remotely on industrial automation platforms could lead to disruption of critical processes, data manipulation, or complete system compromise. The vulnerability affects environments where Advantech WebAccess is deployed for monitoring and control of industrial processes, manufacturing operations, and critical infrastructure systems. Organizations relying on these systems face significant risk of operational disruption, safety hazards, and potential financial losses if exploited successfully. The vulnerability's remote exploitability means that attackers do not require physical access to the systems, making it particularly concerning for air-gapped or isolated industrial environments.
The security implications of CVE-2016-0856 align with CWE-121 stack-based buffer overflow classification, which falls under the broader category of memory safety vulnerabilities that have been consistently identified as high-risk threats in industrial control systems. This vulnerability demonstrates the critical need for robust input validation and memory management practices in operational technology environments. Organizations should implement immediate mitigation strategies including software updates to version 8.1 or later, network segmentation to isolate affected systems, and monitoring for suspicious network activity. The ATT&CK framework would categorize this vulnerability under the T1203 Exploitation for Client Execution technique, as it enables remote code execution through software exploitation. Additionally, organizations should consider implementing intrusion detection systems specifically configured to detect exploitation attempts targeting industrial control system vulnerabilities, as these systems often operate in environments where traditional cybersecurity controls may be insufficient to prevent successful exploitation.