CVE-2018-7527 in LeviStudio HMI Editor
Summary
by MITRE
A buffer overflow can be triggered in LeviStudio HMI Editor, Version 1.10 part of Wecon LeviStudioU 1.8.29, and PI Studio HMI Project Programmer, Build: November 11, 2017 and prior by opening a specially crafted file.
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Analysis
by VulDB Data Team • 02/01/2020
The vulnerability identified as CVE-2018-7527 represents a critical buffer overflow flaw within LeviStudio HMI Editor version 1.10, which is part of the Wecon LeviStudioU 1.8.29 suite and PI Studio HMI Project Programmer with build date November 11, 2017 or earlier. This vulnerability stems from inadequate input validation mechanisms that fail to properly handle maliciously crafted data structures during file processing operations. The flaw manifests when the affected software attempts to parse and open specially constructed files that contain oversized data payloads, leading to memory corruption conditions that can be exploited by attackers. The vulnerability operates at the application layer and specifically targets the file parsing functionality of these industrial human machine interface development tools.
The technical implementation of this buffer overflow occurs due to improper bounds checking within the file handling routines of the HMI editors. When processing user-supplied data from external files, the software does not adequately validate the size or structure of incoming data segments, allowing an attacker to craft malicious input that exceeds the allocated buffer space. This condition falls under CWE-121, which describes stack-based buffer overflow vulnerabilities, and CWE-122, which covers heap-based buffer overflow scenarios. The vulnerability is particularly dangerous because it can be triggered through simple file manipulation without requiring any specialized knowledge of the underlying system architecture. The flaw creates a predictable memory corruption pattern that allows for potential code execution or system instability, making it a significant concern for industrial control systems environments.
The operational impact of CVE-2018-7527 extends beyond simple system crashes or hangs, as it can potentially enable remote code execution within the context of the running application. In industrial settings where these HMI editors are used for developing and configuring human machine interface applications, successful exploitation could lead to unauthorized access to critical control systems, data manipulation, or disruption of industrial processes. The vulnerability affects environments where these specific versions of HMI development software are deployed, particularly in manufacturing, process control, and automation systems. Attackers could leverage this flaw by delivering malicious files through social engineering, phishing campaigns, or by compromising legitimate software distribution channels, making it particularly dangerous in environments with limited network segmentation or security controls.
Organizations should implement immediate mitigations including updating to patched versions of the affected software, implementing strict file validation procedures, and establishing network segmentation controls to limit the potential impact of exploitation. The vulnerability aligns with ATT&CK technique T1203, which covers exploitation for privilege escalation through software vulnerabilities, and T1059, which covers command and scripting interpreter usage. Security teams should also consider implementing application whitelisting policies to prevent execution of untrusted files and establish robust monitoring for suspicious file processing activities. Additionally, regular security assessments of industrial control system environments should include vulnerability scanning for similar buffer overflow conditions in other industrial software platforms to ensure comprehensive protection against similar threats.