CVE-2017-12706 in WebAccess
Summary
by MITRE
A stack-based buffer overflow issue was discovered in Advantech WebAccess versions prior to V8.2_20170817. Researchers have identified multiple vulnerabilities where there is a lack of proper validation of the length of user-supplied data prior to copying it to a stack-based buffer, which could allow an attacker to execute arbitrary code under the context of the process.
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Analysis
by VulDB Data Team • 11/12/2019
The vulnerability identified as CVE-2017-12706 represents a critical stack-based buffer overflow in Advantech WebAccess software versions prior to V8.2_20170817. This flaw stems from inadequate input validation mechanisms that fail to properly check the length of user-supplied data before copying it into stack-based buffers. The vulnerability manifests when the application processes external input without sufficient bounds checking, creating an exploitable condition where attacker-controlled data can overwrite adjacent stack memory locations. Such buffer overflow conditions are particularly dangerous because they can be leveraged to execute arbitrary code with the privileges of the affected process, potentially leading to complete system compromise. The issue is classified under CWE-121 Stack-based Buffer Overflow, which is a well-documented weakness in software security that has been consistently identified as a high-risk vulnerability across numerous security assessments and penetration testing exercises.
The technical exploitation of this vulnerability requires an attacker to craft malicious input that exceeds the allocated buffer size, causing a stack overflow that can be manipulated to redirect program execution flow. When user-supplied data is copied to a stack buffer without proper length validation, the overflow can overwrite return addresses, function pointers, and other critical stack variables. This allows attackers to inject and execute malicious code within the context of the WebAccess process, potentially gaining unauthorized access to industrial control systems and operational technology environments. The vulnerability is particularly concerning in industrial settings where Advantech WebAccess is commonly deployed for SCADA and HMI applications, as these systems often control critical infrastructure components. Attackers following the MITRE ATT&CK framework might leverage this vulnerability as part of a broader attack chain targeting industrial control systems, potentially progressing from initial compromise to persistent access and lateral movement within operational technology networks.
The operational impact of this vulnerability extends beyond simple code execution, as it can lead to significant disruptions in industrial processes and potential safety hazards. Organizations using affected versions of Advantech WebAccess face risks including unauthorized access to critical control systems, data integrity compromise, and potential physical damage to industrial equipment. The vulnerability affects not just individual systems but entire industrial networks that rely on WebAccess for monitoring and control operations. Security teams must consider the broader implications of such vulnerabilities in OT environments where traditional cybersecurity measures may not be sufficient to prevent exploitation. Remediation efforts should include immediate patching of affected systems, implementation of network segmentation to limit access to critical systems, and enhanced monitoring for suspicious activities that might indicate exploitation attempts. Organizations should also conduct comprehensive vulnerability assessments to identify other potential entry points in their industrial control system environments, as this vulnerability demonstrates the importance of input validation and proper memory management in mission-critical applications. The incident underscores the necessity for robust security practices in industrial environments where software vulnerabilities can have far-reaching consequences beyond traditional information technology domains.