CVE-2018-14818 in PI Studio HMI
Summary
by MITRE
WECON Technology Co., Ltd. PI Studio HMI versions 4.1.9 and prior and PI Studio versions 4.2.34 and prior have a stack-based buffer overflow vulnerability which may allow remote code execution.
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Analysis
by VulDB Data Team • 03/31/2020
The vulnerability identified as CVE-2018-14818 affects WECON Technology Co., Ltd. PI Studio HMI and PI Studio software versions 4.1.9 and earlier, as well as PI Studio versions 4.2.34 and earlier. This represents a critical security flaw that exposes industrial control systems to potential remote exploitation. The affected products are widely used in industrial environments for human machine interface applications, making this vulnerability particularly concerning for operational technology infrastructure. The vulnerability stems from inadequate input validation within the software's processing mechanisms, creating a pathway for malicious actors to execute arbitrary code on affected systems.
The technical flaw manifests as a stack-based buffer overflow condition that occurs when the software processes specially crafted input data. 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. The overflow occurs in the software's handling of user-supplied data, particularly when processing network requests or configuration parameters. Attackers can exploit this vulnerability by sending malicious data packets to the affected system, causing the program to write beyond the allocated buffer space and potentially overwrite critical program execution data such as return addresses or function pointers.
The operational impact of this vulnerability extends beyond simple remote code execution, as it can compromise entire industrial control systems that rely on these HMI platforms. The vulnerability allows attackers to gain unauthorized access to systems running the affected software, potentially enabling them to manipulate industrial processes, access sensitive operational data, or disrupt critical infrastructure operations. This represents a significant risk to industrial cybersecurity, as the affected systems are often deployed in critical infrastructure sectors including manufacturing, energy, and water treatment facilities. The vulnerability's remote exploitability means attackers can target these systems from external networks without requiring physical access, making it particularly dangerous for operational technology environments that may have limited network segmentation.
Mitigation strategies for this vulnerability should include immediate software updates from WECON Technology Co., Ltd. to the latest available versions that contain patches for the buffer overflow condition. Organizations should implement network segmentation to isolate affected systems from critical infrastructure components and deploy intrusion detection systems to monitor for suspicious network activity. The vulnerability's classification as a remote code execution flaw aligns with ATT&CK technique T1203, which covers legitimate user access for privilege escalation, and T1059, which addresses command and scripting interpreters. Security teams should also conduct comprehensive vulnerability assessments of their industrial control system environments to identify any other potentially affected systems running similar software versions. Additionally, implementing network monitoring solutions that can detect anomalous traffic patterns and unauthorized access attempts will help mitigate the risk of exploitation while patches are being deployed across the organization's infrastructure.