CVE-2017-12070 in OPC Foundation
Summary
by MITRE
Unsigned versions of the DLLs distributed by the OPC Foundation may be replaced with malicious code.
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Analysis
by VulDB Data Team • 02/19/2020
The vulnerability identified as CVE-2017-12070 represents a critical security flaw in the OPC Foundation's distribution practices that affects industrial control systems and automation environments. This issue stems from the distribution of unsigned Dynamic Link Library files that can be maliciously replaced by attackers, creating a persistent threat vector within operational technology networks. The vulnerability specifically impacts systems that rely on OPC (OLE for Process Control) communication protocols, which are fundamental to industrial automation and supervisory control systems. The lack of code signing validation creates an environment where adversaries can substitute legitimate DLL components with malicious variants without detection, potentially compromising entire industrial networks.
The technical flaw resides in the absence of digital signatures on distributed OPC Foundation DLL files, which should have been implemented as part of standard security practices for software distribution. This unsigned state allows attackers to perform supply chain attacks by replacing legitimate binaries with compromised versions that maintain identical filenames and expected interfaces. The vulnerability operates at the system level where Windows security mechanisms that typically validate code integrity cannot function properly due to missing signature validation. According to CWE-610, this represents a weakness where resources are accessible to attackers who can modify them, and the flaw directly enables unauthorized code execution within the target environment. The attack vector leverages the trust relationship that exists between OPC clients and servers, where legitimate software components are expected to be untampered.
The operational impact of CVE-2017-12070 extends beyond simple code replacement, creating potential for severe industrial control system compromise and operational disruption. Attackers can leverage this vulnerability to inject malicious code into industrial processes, potentially causing system failures, data corruption, or unauthorized access to critical infrastructure. The vulnerability affects environments that utilize OPC UA (Unified Architecture) and OPC DA (Data Access) protocols, which are widely deployed in manufacturing, energy, and process control industries. Organizations operating in these sectors face significant risk of targeted attacks that could result in production downtime, safety incidents, or regulatory compliance violations. The attack can be executed through various means including physical access, network-based attacks, or social engineering to manipulate the software update process.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security posture improvements. Organizations should implement strict code signing policies and ensure all OPC Foundation components are verified using proper digital signatures before deployment. The ATT&CK framework categorizes this vulnerability under the technique of "Supply Chain Compromise" where adversaries compromise legitimate software distribution channels. Security measures should include regular inventory management of OPC components, implementation of file integrity monitoring systems, and enforcement of secure software update procedures. System administrators should disable automatic updates for OPC components when the signing keys are not properly validated and implement network segmentation to limit the potential impact of successful attacks. Additionally, organizations should conduct regular security assessments of their industrial control systems to identify and remediate similar unsigned component vulnerabilities that could provide similar attack vectors.