CVE-2018-14816 in WebAccess
Summary
by MITRE
Advantech WebAccess 8.3.1 and earlier has several stack-based buffer overflow vulnerabilities that have been identified, which may allow an attacker to execute arbitrary code.
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Analysis
by VulDB Data Team • 05/30/2023
The CVE-2018-14816 vulnerability affects Advantech WebAccess versions 8.3.1 and earlier, representing a critical stack-based buffer overflow flaw that poses significant security risks to industrial control systems. These vulnerabilities are particularly concerning as they target the WebAccess SCADA platform, which is widely deployed in manufacturing and industrial environments for process control and monitoring. The affected system components include the web server and various communication modules that handle data processing and network requests from remote clients. The buffer overflow conditions occur when the application fails to properly validate input data lengths before copying them into fixed-size memory buffers, creating opportunities for malicious code execution.
The technical implementation of this vulnerability stems from inadequate bounds checking mechanisms within the WebAccess application's memory management functions. When processing network requests or user inputs, the software attempts to copy data into stack-based buffers without verifying that the incoming data exceeds the allocated buffer size. This flaw allows attackers to overwrite adjacent memory locations including return addresses, function pointers, and other critical execution context data. The vulnerability is particularly dangerous because it can be exploited through multiple attack vectors including HTTP requests, OPC communication protocols, and direct network connections to the WebAccess server. The stack-based nature of the overflow means that attackers can manipulate the program's execution flow by overwriting the return address on the stack, potentially leading to arbitrary code execution with the privileges of the WebAccess service account.
The operational impact of CVE-2018-14816 extends beyond simple code execution, as it represents a severe threat to industrial control system integrity and operational continuity. Attackers exploiting this vulnerability could gain unauthorized access to critical industrial processes, potentially causing production disruptions, safety hazards, or data breaches in manufacturing environments. The vulnerability affects organizations using Advantech WebAccess in sectors such as oil and gas, water treatment, power generation, and automotive manufacturing where system reliability is paramount. The potential for remote code execution without authentication means that attackers could compromise entire industrial networks from external positions, making this vulnerability particularly attractive for nation-state actors and cybercriminal organizations targeting critical infrastructure. According to CWE-121, this vulnerability maps directly to stack-based buffer overflow conditions, while the ATT&CK framework categorizes this as a code injection technique under the execution phase, potentially enabling further lateral movement within industrial networks.
Organizations should implement immediate mitigation strategies including applying the vendor-provided security patches released for Advantech WebAccess 8.3.2 and subsequent versions. Network segmentation and access controls should be strengthened to limit exposure of WebAccess servers to untrusted networks, while implementing intrusion detection systems to monitor for exploitation attempts. Regular security assessments and vulnerability scanning should be conducted to identify any remaining instances of vulnerable WebAccess installations within industrial networks. System administrators should also consider implementing network monitoring solutions that can detect unusual traffic patterns or attempted exploitation of buffer overflow vulnerabilities. The remediation process must include comprehensive testing of patches in controlled environments before deployment to production systems, ensuring that critical industrial processes remain operational while addressing the security vulnerability. Additionally, organizations should develop incident response procedures specifically tailored to industrial control system security incidents, as the potential for cascading failures in critical infrastructure requires specialized response protocols beyond traditional information technology security measures.