CVE-2017-16724 in WebAccess
Summary
by MITRE
A Stack-based Buffer Overflow issue was discovered in Advantech WebAccess versions prior to 8.3. There are multiple instances of a vulnerability that allows too much data to be written to a location on the stack.
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Analysis
by VulDB Data Team • 12/19/2019
The vulnerability identified as CVE-2017-16724 represents a critical stack-based buffer overflow flaw within Advantech WebAccess software versions prior to 8.3. This type of vulnerability falls under CWE-121 which specifically addresses stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations on the program stack. The flaw manifests in multiple locations within the software architecture, creating numerous potential attack vectors for malicious actors seeking to exploit this weakness.
The technical implementation of this buffer overflow vulnerability stems from inadequate input validation mechanisms within the Advantech WebAccess application. When processing user-supplied data or network communications, the software fails to properly enforce size limitations on buffer allocations, allowing excessive data to be written beyond the allocated stack memory boundaries. This condition creates a scenario where adjacent stack variables, return addresses, and program control information can be overwritten, potentially enabling arbitrary code execution. The vulnerability is particularly dangerous because it can be triggered through various input channels within the WebAccess environment, including network protocols and data processing functions.
From an operational perspective, this vulnerability poses significant risks to industrial control systems and SCADA environments where Advantech WebAccess is deployed. The stack-based buffer overflow creates opportunities for attackers to gain unauthorized access to critical infrastructure systems, potentially leading to system compromise, data manipulation, or service disruption. The impact extends beyond simple denial of service scenarios, as successful exploitation could allow attackers to execute malicious code with the privileges of the affected application, potentially enabling lateral movement within network environments and access to sensitive operational data. This vulnerability directly impacts the integrity and availability of industrial automation systems that rely on WebAccess for monitoring and control functions.
Organizations should immediately implement mitigation strategies including upgrading to Advantech WebAccess version 8.3 or later, which contains the necessary patches to address this vulnerability. Network segmentation and access controls should be strengthened to limit exposure of affected systems, while regular security assessments should be conducted to identify and remediate similar vulnerabilities. The mitigation approach should align with industry best practices for industrial cybersecurity and align with frameworks such as NIST SP 800-82 for industrial control systems security. Additionally, implementing intrusion detection systems and monitoring for anomalous network traffic patterns can help detect potential exploitation attempts. Security teams should also consider conducting vulnerability assessments using tools that specifically target industrial control system vulnerabilities to ensure comprehensive protection against similar stack-based buffer overflow threats.