CVE-2018-8837 in WebAccess HMI Designer
Summary
by MITRE
Processing specially crafted .pm3 files in Advantech WebAccess HMI Designer 2.1.7.32 and prior may cause the system to write outside the intended buffer area and may allow remote code execution.
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Analysis
by VulDB Data Team • 01/31/2020
The vulnerability identified as CVE-2018-8837 represents a critical buffer overflow flaw within Advantech WebAccess HMI Designer version 2.1.7.32 and earlier releases. This issue manifests when the software processes specially crafted .pm3 files, which are typically used for configuring human machine interface designs in industrial automation environments. The vulnerability stems from inadequate input validation mechanisms that fail to properly sanitize file content before processing, creating an exploitable condition that can be leveraged by malicious actors to execute arbitrary code on affected systems.
The technical nature of this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. In the context of WebAccess HMI Designer, this manifests as a classic buffer overflow scenario where the application's handling of .pm3 file structures does not adequately verify the size or content of incoming data. The flaw specifically occurs during the parsing of project files that contain malformed or oversized data segments, causing the application to write beyond allocated buffer boundaries and potentially overwrite critical program memory regions including return addresses and function pointers.
From an operational perspective, this vulnerability presents significant risks to industrial control systems and operational technology environments where Advantech WebAccess HMI Designer is deployed. The remote code execution capability means that attackers can potentially compromise entire industrial automation networks without requiring physical access to the systems. This vulnerability directly impacts the integrity and availability of critical infrastructure systems, as successful exploitation could lead to unauthorized access to process controls, data manipulation, or complete system compromise. The attack vector is particularly concerning because it requires minimal user interaction beyond opening a malicious file, making it suitable for phishing attacks or other social engineering campaigns targeting industrial environments.
The security implications extend beyond immediate system compromise to encompass broader operational technology security concerns. Organizations utilizing WebAccess HMI Designer in manufacturing, process control, or critical infrastructure environments face potential disruption to their operations, data integrity issues, and possible safety hazards if control systems are compromised. This vulnerability falls under the ATT&CK technique T1059.007 for Command and Scripting Interpreter, as successful exploitation would enable attackers to execute arbitrary code and potentially establish persistence within the industrial network. The lack of proper input validation in this industrial software component represents a fundamental security weakness that could be exploited to gain unauthorized access to critical manufacturing processes and control systems.
Organizations should implement immediate mitigation strategies including updating to the latest version of Advantech WebAccess HMI Designer where the vulnerability has been addressed through proper bounds checking and input validation. Network segmentation and access controls should be implemented to limit exposure of affected systems, while security monitoring should be enhanced to detect potential exploitation attempts. Additionally, regular security assessments of industrial control systems should be conducted to identify similar vulnerabilities in other industrial software components. The remediation process should include comprehensive testing of updated software versions to ensure that the buffer overflow protection mechanisms are properly implemented and functioning as intended.